Related
I have the following which can be dynamic
const data = '<users>
<user>
<firstname>test</firstname>
<lastname />
<age />
</user>
</users>'
I want to find every instance where its closed with a /> and expand e.g <age /> becomes <age></age>
obviously I can do this with named tags e.g
data = data.replaceAll("age />", "age></age>")
but how do I do this globally for tags which I dont know the name?
From the above comments ...
"The OP could create an XMLDocument via DOMParser.parseFromString like e.g. const doc = (new DOMParser).parseFromString(data, 'application/xml');. But then the OP needs to write own serializing functionality since the XMLSerializer's serializeToString method will serialize each empty node into its empty tag representation."
The next provided example code comes with a custom serializer in order to prove that the suggested approach can be implemented with not that much effort.
const data = `<users lang="en">
<user uuid="1232-3965-6923-2887">
<firstname>test</firstname>
<lastname/>
<age type="integer"/>
</user>
</users>`;
const xmlDoc = (new DOMParser).parseFromString(data, 'application/xml');
const xmlSerializerMarkup = (new XMLSerializer).serializeToString(xmlDoc);
const documentElementMarkup = xmlDoc.documentElement.outerHTML;
console.log('originally provided markup...\n', data);
console.log('XMLSerializer markup...\n', xmlSerializerMarkup);
console.log('documentElement markup...\n', documentElementMarkup);
function serialize(elmNode, indention = '') {
const { nodeName, childElementCount } = elmNode;
let currentMarkup = elmNode
.getAttributeNames()
.reduce((markup, attrName) => [
markup,
' ',
attrName,
'="',
elmNode.getAttribute(attrName),
'"',
].join(''), `${ indention }<${ nodeName }`);
if (childElementCount === 0) {
const { textContent } = elmNode;
if (textContent === '') {
// entirely empty element node.
// do not implement/support the empty tag style.
currentMarkup = currentMarkup + `><\/${ nodeName }>`;
} else {
currentMarkup = [
currentMarkup,
'>',
textContent,
`<\/${ nodeName }>`,
].join('');
}
} else {
let nestedMarkup = '';
[...elmNode.children]
.forEach(childElement => {
nestedMarkup = [
nestedMarkup,
serialize(childElement, (indention + ' ')),
].join('\n');
});
currentMarkup = [
currentMarkup,
nestedMarkup,
].join('>') + `\n${ indention }<\/${ nodeName }>`;
}
return currentMarkup;
}
const customSerializerMarkup = serialize(xmlDoc.documentElement);
console.log('custom serializer markup...\n', customSerializerMarkup);
.as-console-wrapper { min-height: 100%!important; top: 0; }
Would you mind using/adapting something like JsStAX (full disclosure: a little portation project of mine to make an implementation of Java's Streaming API for XML available in JavaScript)?
Benefit is that with the outer event loop, you have pretty good control over what output you want to generate, as well as no trouble with any variations in the XML format.
Is it too heavy, are required/desired features missing (as it's not XML-feature-complete), objecting to the license? But does the job, apart from the many possible improvements or other, potentially better solutions.
For my node js projects i typically have a text.json file and require it, instead of having static text within my code. something like below
JSON file
{
"greet":"Hello world"
}
var text = require('./text.json');
var greet = text.greet
I am having a little trouble in figuring out how this would work with template literals ?
I know this is an old issue but I just came up with a need for the same thing and.. yeah there are node modules that help do this but, this isn't that complex so I just made my own solution
function injectVariables( replacements, input ) {
const entries = Object.entries(replacements)
const result = entries.reduce( (output, entry) => {
const [key, value] = entry
const regex = new RegExp( `\\$\{${key}\}`, 'g')
return output.replace( regex, value )
}, input )
return result
}
const template = 'Hello my name is ${name} and I like ${language}'
const inputs = { name: 'David', language: 'JavaScript' }
const replaced = injectVariables(inputs, template)
console.log(replaced)
So, in this, it takes an input string and an object where the keys are the variable names in the string and the values are, you guessed it, the values.
It creates an array the values using Object.entries and then runs reduce across the entries to keep an updated version of the string as you go. On each iteration it makes a regex to match the variable expression and replaces that value with the one passed it.
This in particular won't look through nested objects (I didn't need that) but if for example your string had ${name.last} in it, since object keys can be strings, your input variable could be inputs = { 'name.last': 'Smith' } and it should work.
Hopefully this helps someone else.
I often use a very tiny templating helper library (tim - https://github.com/premasagar/tim) and it can be used to accomplish this:
//in my json file
var strings = {
'Hello': 'Hello {{name}}!',
'Goodbye': 'Goodbye {{name}}!'
};
//in my app
var tim = require('tim'); //templating library
var strings = require('./strings.json');
//replace
console.log(tim(strings.Hello,{name:'Fred'}));
Relevant JSFiddle:
https://jsfiddle.net/rtresjqv/
Alternatively, you could turn your strings into functions and then pass in the arguments:
//in my json file
var strings = {
'Hello': function() { return `Hello ${arguments[0]}!`; },
'Goodbye': function() { return `Goodbye {$arguments[0]}!`; }
};
//in my app
var strings = require('./strings.json');
//replace
console.log(strings.Hello('Fred'));
Fiddle:
https://jsfiddle.net/t6ta0576/
How would you convert from XML to JSON and then back to XML?
The following tools work quite well, but aren't completely consistent:
xml2json
Has anyone encountered this situation before?
I think this is the best one: Converting between XML and JSON
Be sure to read the accompanying article on the xml.com O'Reilly site, which goes into details of the problems with these conversions, which I think you will find enlightening. The fact that O'Reilly is hosting the article should indicate that Stefan's solution has merit.
https://github.com/abdmob/x2js - my own library (updated URL from http://code.google.com/p/x2js/):
This library provides XML to JSON (JavaScript Objects) and vice versa javascript conversion functions. The library is very small and doesn't require any other additional libraries.
API functions
new X2JS() - to create your instance to access all library functionality. Also you could specify optional configuration options here
X2JS.xml2json - Convert XML specified as DOM Object to JSON
X2JS.json2xml - Convert JSON to XML DOM Object
X2JS.xml_str2json - Convert XML specified as string to JSON
X2JS.json2xml_str - Convert JSON to XML string
Online Demo on http://jsfiddle.net/abdmob/gkxucxrj/1/
var x2js = new X2JS();
function convertXml2JSon() {
$("#jsonArea").val(JSON.stringify(x2js.xml_str2json($("#xmlArea").val())));
}
function convertJSon2XML() {
$("#xmlArea").val(x2js.json2xml_str($.parseJSON($("#jsonArea").val())));
}
convertXml2JSon();
convertJSon2XML();
$("#convertToJsonBtn").click(convertXml2JSon);
$("#convertToXmlBtn").click(convertJSon2XML);
These answers helped me a lot to make this function:
function xml2json(xml) {
try {
var obj = {};
if (xml.children.length > 0) {
for (var i = 0; i < xml.children.length; i++) {
var item = xml.children.item(i);
var nodeName = item.nodeName;
if (typeof (obj[nodeName]) == "undefined") {
obj[nodeName] = xml2json(item);
} else {
if (typeof (obj[nodeName].push) == "undefined") {
var old = obj[nodeName];
obj[nodeName] = [];
obj[nodeName].push(old);
}
obj[nodeName].push(xml2json(item));
}
}
} else {
obj = xml.textContent;
}
return obj;
} catch (e) {
console.log(e.message);
}
}
As long as you pass in a jquery dom/xml object: for me it was:
Jquery(this).find('content').eq(0)[0]
where content was the field I was storing my xml in.
I've created a recursive function based on regex, in case you don't want to install library and understand the logic behind what's happening:
const xmlSample = '<tag>tag content</tag><tag2>another content</tag2><tag3><insideTag>inside content</insideTag><emptyTag /></tag3>';
console.log(parseXmlToJson(xmlSample));
function parseXmlToJson(xml) {
const json = {};
for (const res of xml.matchAll(/(?:<(\w*)(?:\s[^>]*)*>)((?:(?!<\1).)*)(?:<\/\1>)|<(\w*)(?:\s*)*\/>/gm)) {
const key = res[1] || res[3];
const value = res[2] && parseXmlToJson(res[2]);
json[key] = ((value && Object.keys(value).length) ? value : res[2]) || null;
}
return json;
}
Regex explanation for each loop:
res[0] - return the xml (as is)
res[1] - return the xml tag name
res[2] - return the xml content
res[3] - return the xml tag name in case the tag closes itself. In example: <tag />
You can check how the regex works here:
https://regex101.com/r/ZJpCAL/1
Note: In case json has a key with an undefined value, it is being removed.
That's why I've inserted null at the end of line 9.
I was using xmlToJson just to get a single value of the xml.
I found doing the following is much easier (if the xml only occurs once..)
let xml =
'<person>' +
' <id>762384324</id>' +
' <firstname>Hank</firstname> ' +
' <lastname>Stone</lastname>' +
'</person>';
let getXmlValue = function(str, key) {
return str.substring(
str.lastIndexOf('<' + key + '>') + ('<' + key + '>').length,
str.lastIndexOf('</' + key + '>')
);
}
alert(getXmlValue(xml, 'firstname')); // gives back Hank
You can also use txml. It can parse into a DOM made of simple objects and stringify. In the result, the content will be trimmed. So formating of the original with whitespaces will be lost. But this could be used very good to minify HTML.
const xml = require('txml');
const data = `
<tag>tag content</tag>
<tag2>another content</tag2>
<tag3>
<insideTag>inside content</insideTag>
<emptyTag />
</tag3>`;
const dom = xml(data); // the dom can be JSON.stringified
xml.stringify(dom); // this will return the dom into an xml-string
Disclaimer: I am the author of txml, the fastest xml parser in javascript.
A while back I wrote this tool https://bitbucket.org/surenrao/xml2json for my TV Watchlist app, hope this helps too.
Synopsys: A library to not only convert xml to json, but is also easy to debug (without circular errors) and recreate json back to xml. Features :- Parse xml to json object. Print json object back to xml. Can be used to save xml in IndexedDB as X2J objects. Print json object.
In 6 simple ES6 lines:
xml2json = xml => {
var el = xml.nodeType === 9 ? xml.documentElement : xml
var h = {name: el.nodeName}
h.content = Array.from(el.childNodes || []).filter(e => e.nodeType === 3).map(e => e.textContent).join('').trim()
h.attributes = Array.from(el.attributes || []).filter(a => a).reduce((h, a) => { h[a.name] = a.value; return h }, {})
h.children = Array.from(el.childNodes || []).filter(e => e.nodeType === 1).map(c => h[c.nodeName] = xml2json(c))
return h
}
Test with echo "xml2json_example()" | node -r xml2json.es6 with source at https://github.com/brauliobo/biochemical-db/blob/master/lib/xml2json.es6
Disclaimer: I've written fast-xml-parser
Fast XML Parser can help to convert XML to JSON and vice versa. Here is the example;
var options = {
attributeNamePrefix : "#_",
attrNodeName: "attr", //default is 'false'
textNodeName : "#text",
ignoreAttributes : true,
ignoreNameSpace : false,
allowBooleanAttributes : false,
parseNodeValue : true,
parseAttributeValue : false,
trimValues: true,
decodeHTMLchar: false,
cdataTagName: "__cdata", //default is 'false'
cdataPositionChar: "\\c",
};
if(parser.validate(xmlData)=== true){//optional
var jsonObj = parser.parse(xmlData,options);
}
If you want to parse JSON or JS object into XML then
//default options need not to set
var defaultOptions = {
attributeNamePrefix : "#_",
attrNodeName: "#", //default is false
textNodeName : "#text",
ignoreAttributes : true,
encodeHTMLchar: false,
cdataTagName: "__cdata", //default is false
cdataPositionChar: "\\c",
format: false,
indentBy: " ",
supressEmptyNode: false
};
var parser = new parser.j2xParser(defaultOptions);
var xml = parser.parse(json_or_js_obj);
Here' a good tool from a documented and very famous npm library that does the xml <-> js conversions very well: differently from some (maybe all) of the above proposed solutions, it converts xml comments also.
var obj = {name: "Super", Surname: "Man", age: 23};
var builder = new xml2js.Builder();
var xml = builder.buildObject(obj);
I would personally recommend this tool. It is an XML to JSON converter.
It is very lightweight and is in pure JavaScript. It needs no dependencies. You can simply add the functions to your code and use it as you wish.
It also takes the XML attributes into considerations.
var xml = ‘<person id=”1234” age=”30”><name>John Doe</name></person>’;
var json = xml2json(xml);
console.log(json);
// prints ‘{“person”: {“id”: “1234”, “age”: “30”, “name”: “John Doe”}}’
Here's an online demo!
There is an open sourced library Xml-to-json with methods jsonToXml(json) and xmlToJson(xml).
Here's an online demo!
This function directly reads the DOM properties of the XMLDocument (or document node/element) to build the JSON completely and accurately without trying to guess or match. Pass it responseXML, not responseText from XMLHttpRequest.
xml2json(xmlDoc)
If you only have a string of XML and not an XMLDocument, jQuery will convert your text to one.
xml2json($(xmlString)[0])
Each node becomes an object. (All elements are nodes, not all nodes are elements (e.g. text within an element).)
Every object contains the node name and type.
If it has attributes, they appear as properties in an attributes object.
If it has children, they appear recursively as node->objects in a children array.
If it's a Text, CDATA, or Comment node (bare text between element tags) or a comment, it shouldn't have attributes or children but the text will be in a text property.
{
// Always present
"name": "FancyElement",
"type": "Element",
// If present
"attributes: {
"attr1": "val1",
"attr2": "val2"
},
"children": [...],
"text": "buncha fancy words"
}
Caveat: I'm not familiar with all the node types. It's probably not grabbing needed/useful info from all of them. It was tested on and behaves as expected for
Element
Text
CDATA
Comment
Document
function xml2json(xml) {
try {
const types = [null,
"Element",
"Attribute",
"Text",
"CDATA",
"EntityReference", // Deprecated
"Entity", // Deprecated
"ProcessingInstruction",
"Comment",
"Document",
"DocumentType",
"DocumentFragment",
"Notation" // Deprecated
];
var o = {};
o.name = xml.nodeName;
o.type = types[xml.nodeType];
if (xml.nodeType == 3 ||
xml.nodeType == 4 ||
xml.nodeType == 8 ) {
o.text = xml.textContent;
} else {
if (xml.attributes) {
o.attributes = {};
for (const a of xml.attributes) {
o.attributes[a.name] = a.value;
}
}
if (xml.childNodes.length) {
o.children = [];
for (const x of xml.childNodes) {
o.children.push(xml2json(x))
}
}
}
return (o);
} catch (e) {
alert('Error in xml2json. See console for details.');
console.log('Error in xml2json processing node:');
console.log(o);
console.log('Error:');
console.log(e);
}
}
var doc = document.getElementById("doc");
var out = document.getElementById("out");
out.innerText = JSON.stringify(xml2json(doc), null, 2);
/* Let's process the whole Code Snippet #document, why not?
* Yes, the JSON we just put in the document body and all
* this code is encoded in the JSON in the console.
* In that copy you can see why the XML DOM will all be one line.
* The JSON in the console has "\n" nodes all throughout.
*/
console.log(xml2json(document));
#doc,
#out {
border: 1px solid black;
}
<div id="doc"><!-- The XML DOM will all be on one line --><div personality="bubbly" relevance=42>This text is valid for HTML.<span>But it probably shouldn't be siblings to an element in XML.</span></div></div>
<pre id="out"></pre>
The best way to do it using server side as client side doesn't work well in all scenarios. I was trying to build online json to xml and xml to json converter using javascript and I felt almost impossible as it was not working in all scenarios. Ultimately I ended up doing it server side using Newtonsoft in ASP.MVC. Here is the online converter http://techfunda.com/Tools/XmlToJson
How would you convert from XML to JSON and then back to XML?
The following tools work quite well, but aren't completely consistent:
xml2json
Has anyone encountered this situation before?
I think this is the best one: Converting between XML and JSON
Be sure to read the accompanying article on the xml.com O'Reilly site, which goes into details of the problems with these conversions, which I think you will find enlightening. The fact that O'Reilly is hosting the article should indicate that Stefan's solution has merit.
https://github.com/abdmob/x2js - my own library (updated URL from http://code.google.com/p/x2js/):
This library provides XML to JSON (JavaScript Objects) and vice versa javascript conversion functions. The library is very small and doesn't require any other additional libraries.
API functions
new X2JS() - to create your instance to access all library functionality. Also you could specify optional configuration options here
X2JS.xml2json - Convert XML specified as DOM Object to JSON
X2JS.json2xml - Convert JSON to XML DOM Object
X2JS.xml_str2json - Convert XML specified as string to JSON
X2JS.json2xml_str - Convert JSON to XML string
Online Demo on http://jsfiddle.net/abdmob/gkxucxrj/1/
var x2js = new X2JS();
function convertXml2JSon() {
$("#jsonArea").val(JSON.stringify(x2js.xml_str2json($("#xmlArea").val())));
}
function convertJSon2XML() {
$("#xmlArea").val(x2js.json2xml_str($.parseJSON($("#jsonArea").val())));
}
convertXml2JSon();
convertJSon2XML();
$("#convertToJsonBtn").click(convertXml2JSon);
$("#convertToXmlBtn").click(convertJSon2XML);
These answers helped me a lot to make this function:
function xml2json(xml) {
try {
var obj = {};
if (xml.children.length > 0) {
for (var i = 0; i < xml.children.length; i++) {
var item = xml.children.item(i);
var nodeName = item.nodeName;
if (typeof (obj[nodeName]) == "undefined") {
obj[nodeName] = xml2json(item);
} else {
if (typeof (obj[nodeName].push) == "undefined") {
var old = obj[nodeName];
obj[nodeName] = [];
obj[nodeName].push(old);
}
obj[nodeName].push(xml2json(item));
}
}
} else {
obj = xml.textContent;
}
return obj;
} catch (e) {
console.log(e.message);
}
}
As long as you pass in a jquery dom/xml object: for me it was:
Jquery(this).find('content').eq(0)[0]
where content was the field I was storing my xml in.
I've created a recursive function based on regex, in case you don't want to install library and understand the logic behind what's happening:
const xmlSample = '<tag>tag content</tag><tag2>another content</tag2><tag3><insideTag>inside content</insideTag><emptyTag /></tag3>';
console.log(parseXmlToJson(xmlSample));
function parseXmlToJson(xml) {
const json = {};
for (const res of xml.matchAll(/(?:<(\w*)(?:\s[^>]*)*>)((?:(?!<\1).)*)(?:<\/\1>)|<(\w*)(?:\s*)*\/>/gm)) {
const key = res[1] || res[3];
const value = res[2] && parseXmlToJson(res[2]);
json[key] = ((value && Object.keys(value).length) ? value : res[2]) || null;
}
return json;
}
Regex explanation for each loop:
res[0] - return the xml (as is)
res[1] - return the xml tag name
res[2] - return the xml content
res[3] - return the xml tag name in case the tag closes itself. In example: <tag />
You can check how the regex works here:
https://regex101.com/r/ZJpCAL/1
Note: In case json has a key with an undefined value, it is being removed.
That's why I've inserted null at the end of line 9.
I was using xmlToJson just to get a single value of the xml.
I found doing the following is much easier (if the xml only occurs once..)
let xml =
'<person>' +
' <id>762384324</id>' +
' <firstname>Hank</firstname> ' +
' <lastname>Stone</lastname>' +
'</person>';
let getXmlValue = function(str, key) {
return str.substring(
str.lastIndexOf('<' + key + '>') + ('<' + key + '>').length,
str.lastIndexOf('</' + key + '>')
);
}
alert(getXmlValue(xml, 'firstname')); // gives back Hank
You can also use txml. It can parse into a DOM made of simple objects and stringify. In the result, the content will be trimmed. So formating of the original with whitespaces will be lost. But this could be used very good to minify HTML.
const xml = require('txml');
const data = `
<tag>tag content</tag>
<tag2>another content</tag2>
<tag3>
<insideTag>inside content</insideTag>
<emptyTag />
</tag3>`;
const dom = xml(data); // the dom can be JSON.stringified
xml.stringify(dom); // this will return the dom into an xml-string
Disclaimer: I am the author of txml, the fastest xml parser in javascript.
A while back I wrote this tool https://bitbucket.org/surenrao/xml2json for my TV Watchlist app, hope this helps too.
Synopsys: A library to not only convert xml to json, but is also easy to debug (without circular errors) and recreate json back to xml. Features :- Parse xml to json object. Print json object back to xml. Can be used to save xml in IndexedDB as X2J objects. Print json object.
In 6 simple ES6 lines:
xml2json = xml => {
var el = xml.nodeType === 9 ? xml.documentElement : xml
var h = {name: el.nodeName}
h.content = Array.from(el.childNodes || []).filter(e => e.nodeType === 3).map(e => e.textContent).join('').trim()
h.attributes = Array.from(el.attributes || []).filter(a => a).reduce((h, a) => { h[a.name] = a.value; return h }, {})
h.children = Array.from(el.childNodes || []).filter(e => e.nodeType === 1).map(c => h[c.nodeName] = xml2json(c))
return h
}
Test with echo "xml2json_example()" | node -r xml2json.es6 with source at https://github.com/brauliobo/biochemical-db/blob/master/lib/xml2json.es6
Disclaimer: I've written fast-xml-parser
Fast XML Parser can help to convert XML to JSON and vice versa. Here is the example;
var options = {
attributeNamePrefix : "#_",
attrNodeName: "attr", //default is 'false'
textNodeName : "#text",
ignoreAttributes : true,
ignoreNameSpace : false,
allowBooleanAttributes : false,
parseNodeValue : true,
parseAttributeValue : false,
trimValues: true,
decodeHTMLchar: false,
cdataTagName: "__cdata", //default is 'false'
cdataPositionChar: "\\c",
};
if(parser.validate(xmlData)=== true){//optional
var jsonObj = parser.parse(xmlData,options);
}
If you want to parse JSON or JS object into XML then
//default options need not to set
var defaultOptions = {
attributeNamePrefix : "#_",
attrNodeName: "#", //default is false
textNodeName : "#text",
ignoreAttributes : true,
encodeHTMLchar: false,
cdataTagName: "__cdata", //default is false
cdataPositionChar: "\\c",
format: false,
indentBy: " ",
supressEmptyNode: false
};
var parser = new parser.j2xParser(defaultOptions);
var xml = parser.parse(json_or_js_obj);
Here' a good tool from a documented and very famous npm library that does the xml <-> js conversions very well: differently from some (maybe all) of the above proposed solutions, it converts xml comments also.
var obj = {name: "Super", Surname: "Man", age: 23};
var builder = new xml2js.Builder();
var xml = builder.buildObject(obj);
I would personally recommend this tool. It is an XML to JSON converter.
It is very lightweight and is in pure JavaScript. It needs no dependencies. You can simply add the functions to your code and use it as you wish.
It also takes the XML attributes into considerations.
var xml = ‘<person id=”1234” age=”30”><name>John Doe</name></person>’;
var json = xml2json(xml);
console.log(json);
// prints ‘{“person”: {“id”: “1234”, “age”: “30”, “name”: “John Doe”}}’
Here's an online demo!
There is an open sourced library Xml-to-json with methods jsonToXml(json) and xmlToJson(xml).
Here's an online demo!
This function directly reads the DOM properties of the XMLDocument (or document node/element) to build the JSON completely and accurately without trying to guess or match. Pass it responseXML, not responseText from XMLHttpRequest.
xml2json(xmlDoc)
If you only have a string of XML and not an XMLDocument, jQuery will convert your text to one.
xml2json($(xmlString)[0])
Each node becomes an object. (All elements are nodes, not all nodes are elements (e.g. text within an element).)
Every object contains the node name and type.
If it has attributes, they appear as properties in an attributes object.
If it has children, they appear recursively as node->objects in a children array.
If it's a Text, CDATA, or Comment node (bare text between element tags) or a comment, it shouldn't have attributes or children but the text will be in a text property.
{
// Always present
"name": "FancyElement",
"type": "Element",
// If present
"attributes: {
"attr1": "val1",
"attr2": "val2"
},
"children": [...],
"text": "buncha fancy words"
}
Caveat: I'm not familiar with all the node types. It's probably not grabbing needed/useful info from all of them. It was tested on and behaves as expected for
Element
Text
CDATA
Comment
Document
function xml2json(xml) {
try {
const types = [null,
"Element",
"Attribute",
"Text",
"CDATA",
"EntityReference", // Deprecated
"Entity", // Deprecated
"ProcessingInstruction",
"Comment",
"Document",
"DocumentType",
"DocumentFragment",
"Notation" // Deprecated
];
var o = {};
o.name = xml.nodeName;
o.type = types[xml.nodeType];
if (xml.nodeType == 3 ||
xml.nodeType == 4 ||
xml.nodeType == 8 ) {
o.text = xml.textContent;
} else {
if (xml.attributes) {
o.attributes = {};
for (const a of xml.attributes) {
o.attributes[a.name] = a.value;
}
}
if (xml.childNodes.length) {
o.children = [];
for (const x of xml.childNodes) {
o.children.push(xml2json(x))
}
}
}
return (o);
} catch (e) {
alert('Error in xml2json. See console for details.');
console.log('Error in xml2json processing node:');
console.log(o);
console.log('Error:');
console.log(e);
}
}
var doc = document.getElementById("doc");
var out = document.getElementById("out");
out.innerText = JSON.stringify(xml2json(doc), null, 2);
/* Let's process the whole Code Snippet #document, why not?
* Yes, the JSON we just put in the document body and all
* this code is encoded in the JSON in the console.
* In that copy you can see why the XML DOM will all be one line.
* The JSON in the console has "\n" nodes all throughout.
*/
console.log(xml2json(document));
#doc,
#out {
border: 1px solid black;
}
<div id="doc"><!-- The XML DOM will all be on one line --><div personality="bubbly" relevance=42>This text is valid for HTML.<span>But it probably shouldn't be siblings to an element in XML.</span></div></div>
<pre id="out"></pre>
The best way to do it using server side as client side doesn't work well in all scenarios. I was trying to build online json to xml and xml to json converter using javascript and I felt almost impossible as it was not working in all scenarios. Ultimately I ended up doing it server side using Newtonsoft in ASP.MVC. Here is the online converter http://techfunda.com/Tools/XmlToJson
How would you convert from XML to JSON and then back to XML?
The following tools work quite well, but aren't completely consistent:
xml2json
Has anyone encountered this situation before?
I think this is the best one: Converting between XML and JSON
Be sure to read the accompanying article on the xml.com O'Reilly site, which goes into details of the problems with these conversions, which I think you will find enlightening. The fact that O'Reilly is hosting the article should indicate that Stefan's solution has merit.
https://github.com/abdmob/x2js - my own library (updated URL from http://code.google.com/p/x2js/):
This library provides XML to JSON (JavaScript Objects) and vice versa javascript conversion functions. The library is very small and doesn't require any other additional libraries.
API functions
new X2JS() - to create your instance to access all library functionality. Also you could specify optional configuration options here
X2JS.xml2json - Convert XML specified as DOM Object to JSON
X2JS.json2xml - Convert JSON to XML DOM Object
X2JS.xml_str2json - Convert XML specified as string to JSON
X2JS.json2xml_str - Convert JSON to XML string
Online Demo on http://jsfiddle.net/abdmob/gkxucxrj/1/
var x2js = new X2JS();
function convertXml2JSon() {
$("#jsonArea").val(JSON.stringify(x2js.xml_str2json($("#xmlArea").val())));
}
function convertJSon2XML() {
$("#xmlArea").val(x2js.json2xml_str($.parseJSON($("#jsonArea").val())));
}
convertXml2JSon();
convertJSon2XML();
$("#convertToJsonBtn").click(convertXml2JSon);
$("#convertToXmlBtn").click(convertJSon2XML);
These answers helped me a lot to make this function:
function xml2json(xml) {
try {
var obj = {};
if (xml.children.length > 0) {
for (var i = 0; i < xml.children.length; i++) {
var item = xml.children.item(i);
var nodeName = item.nodeName;
if (typeof (obj[nodeName]) == "undefined") {
obj[nodeName] = xml2json(item);
} else {
if (typeof (obj[nodeName].push) == "undefined") {
var old = obj[nodeName];
obj[nodeName] = [];
obj[nodeName].push(old);
}
obj[nodeName].push(xml2json(item));
}
}
} else {
obj = xml.textContent;
}
return obj;
} catch (e) {
console.log(e.message);
}
}
As long as you pass in a jquery dom/xml object: for me it was:
Jquery(this).find('content').eq(0)[0]
where content was the field I was storing my xml in.
I've created a recursive function based on regex, in case you don't want to install library and understand the logic behind what's happening:
const xmlSample = '<tag>tag content</tag><tag2>another content</tag2><tag3><insideTag>inside content</insideTag><emptyTag /></tag3>';
console.log(parseXmlToJson(xmlSample));
function parseXmlToJson(xml) {
const json = {};
for (const res of xml.matchAll(/(?:<(\w*)(?:\s[^>]*)*>)((?:(?!<\1).)*)(?:<\/\1>)|<(\w*)(?:\s*)*\/>/gm)) {
const key = res[1] || res[3];
const value = res[2] && parseXmlToJson(res[2]);
json[key] = ((value && Object.keys(value).length) ? value : res[2]) || null;
}
return json;
}
Regex explanation for each loop:
res[0] - return the xml (as is)
res[1] - return the xml tag name
res[2] - return the xml content
res[3] - return the xml tag name in case the tag closes itself. In example: <tag />
You can check how the regex works here:
https://regex101.com/r/ZJpCAL/1
Note: In case json has a key with an undefined value, it is being removed.
That's why I've inserted null at the end of line 9.
I was using xmlToJson just to get a single value of the xml.
I found doing the following is much easier (if the xml only occurs once..)
let xml =
'<person>' +
' <id>762384324</id>' +
' <firstname>Hank</firstname> ' +
' <lastname>Stone</lastname>' +
'</person>';
let getXmlValue = function(str, key) {
return str.substring(
str.lastIndexOf('<' + key + '>') + ('<' + key + '>').length,
str.lastIndexOf('</' + key + '>')
);
}
alert(getXmlValue(xml, 'firstname')); // gives back Hank
You can also use txml. It can parse into a DOM made of simple objects and stringify. In the result, the content will be trimmed. So formating of the original with whitespaces will be lost. But this could be used very good to minify HTML.
const xml = require('txml');
const data = `
<tag>tag content</tag>
<tag2>another content</tag2>
<tag3>
<insideTag>inside content</insideTag>
<emptyTag />
</tag3>`;
const dom = xml(data); // the dom can be JSON.stringified
xml.stringify(dom); // this will return the dom into an xml-string
Disclaimer: I am the author of txml, the fastest xml parser in javascript.
A while back I wrote this tool https://bitbucket.org/surenrao/xml2json for my TV Watchlist app, hope this helps too.
Synopsys: A library to not only convert xml to json, but is also easy to debug (without circular errors) and recreate json back to xml. Features :- Parse xml to json object. Print json object back to xml. Can be used to save xml in IndexedDB as X2J objects. Print json object.
In 6 simple ES6 lines:
xml2json = xml => {
var el = xml.nodeType === 9 ? xml.documentElement : xml
var h = {name: el.nodeName}
h.content = Array.from(el.childNodes || []).filter(e => e.nodeType === 3).map(e => e.textContent).join('').trim()
h.attributes = Array.from(el.attributes || []).filter(a => a).reduce((h, a) => { h[a.name] = a.value; return h }, {})
h.children = Array.from(el.childNodes || []).filter(e => e.nodeType === 1).map(c => h[c.nodeName] = xml2json(c))
return h
}
Test with echo "xml2json_example()" | node -r xml2json.es6 with source at https://github.com/brauliobo/biochemical-db/blob/master/lib/xml2json.es6
Disclaimer: I've written fast-xml-parser
Fast XML Parser can help to convert XML to JSON and vice versa. Here is the example;
var options = {
attributeNamePrefix : "#_",
attrNodeName: "attr", //default is 'false'
textNodeName : "#text",
ignoreAttributes : true,
ignoreNameSpace : false,
allowBooleanAttributes : false,
parseNodeValue : true,
parseAttributeValue : false,
trimValues: true,
decodeHTMLchar: false,
cdataTagName: "__cdata", //default is 'false'
cdataPositionChar: "\\c",
};
if(parser.validate(xmlData)=== true){//optional
var jsonObj = parser.parse(xmlData,options);
}
If you want to parse JSON or JS object into XML then
//default options need not to set
var defaultOptions = {
attributeNamePrefix : "#_",
attrNodeName: "#", //default is false
textNodeName : "#text",
ignoreAttributes : true,
encodeHTMLchar: false,
cdataTagName: "__cdata", //default is false
cdataPositionChar: "\\c",
format: false,
indentBy: " ",
supressEmptyNode: false
};
var parser = new parser.j2xParser(defaultOptions);
var xml = parser.parse(json_or_js_obj);
Here' a good tool from a documented and very famous npm library that does the xml <-> js conversions very well: differently from some (maybe all) of the above proposed solutions, it converts xml comments also.
var obj = {name: "Super", Surname: "Man", age: 23};
var builder = new xml2js.Builder();
var xml = builder.buildObject(obj);
I would personally recommend this tool. It is an XML to JSON converter.
It is very lightweight and is in pure JavaScript. It needs no dependencies. You can simply add the functions to your code and use it as you wish.
It also takes the XML attributes into considerations.
var xml = ‘<person id=”1234” age=”30”><name>John Doe</name></person>’;
var json = xml2json(xml);
console.log(json);
// prints ‘{“person”: {“id”: “1234”, “age”: “30”, “name”: “John Doe”}}’
Here's an online demo!
There is an open sourced library Xml-to-json with methods jsonToXml(json) and xmlToJson(xml).
Here's an online demo!
This function directly reads the DOM properties of the XMLDocument (or document node/element) to build the JSON completely and accurately without trying to guess or match. Pass it responseXML, not responseText from XMLHttpRequest.
xml2json(xmlDoc)
If you only have a string of XML and not an XMLDocument, jQuery will convert your text to one.
xml2json($(xmlString)[0])
Each node becomes an object. (All elements are nodes, not all nodes are elements (e.g. text within an element).)
Every object contains the node name and type.
If it has attributes, they appear as properties in an attributes object.
If it has children, they appear recursively as node->objects in a children array.
If it's a Text, CDATA, or Comment node (bare text between element tags) or a comment, it shouldn't have attributes or children but the text will be in a text property.
{
// Always present
"name": "FancyElement",
"type": "Element",
// If present
"attributes: {
"attr1": "val1",
"attr2": "val2"
},
"children": [...],
"text": "buncha fancy words"
}
Caveat: I'm not familiar with all the node types. It's probably not grabbing needed/useful info from all of them. It was tested on and behaves as expected for
Element
Text
CDATA
Comment
Document
function xml2json(xml) {
try {
const types = [null,
"Element",
"Attribute",
"Text",
"CDATA",
"EntityReference", // Deprecated
"Entity", // Deprecated
"ProcessingInstruction",
"Comment",
"Document",
"DocumentType",
"DocumentFragment",
"Notation" // Deprecated
];
var o = {};
o.name = xml.nodeName;
o.type = types[xml.nodeType];
if (xml.nodeType == 3 ||
xml.nodeType == 4 ||
xml.nodeType == 8 ) {
o.text = xml.textContent;
} else {
if (xml.attributes) {
o.attributes = {};
for (const a of xml.attributes) {
o.attributes[a.name] = a.value;
}
}
if (xml.childNodes.length) {
o.children = [];
for (const x of xml.childNodes) {
o.children.push(xml2json(x))
}
}
}
return (o);
} catch (e) {
alert('Error in xml2json. See console for details.');
console.log('Error in xml2json processing node:');
console.log(o);
console.log('Error:');
console.log(e);
}
}
var doc = document.getElementById("doc");
var out = document.getElementById("out");
out.innerText = JSON.stringify(xml2json(doc), null, 2);
/* Let's process the whole Code Snippet #document, why not?
* Yes, the JSON we just put in the document body and all
* this code is encoded in the JSON in the console.
* In that copy you can see why the XML DOM will all be one line.
* The JSON in the console has "\n" nodes all throughout.
*/
console.log(xml2json(document));
#doc,
#out {
border: 1px solid black;
}
<div id="doc"><!-- The XML DOM will all be on one line --><div personality="bubbly" relevance=42>This text is valid for HTML.<span>But it probably shouldn't be siblings to an element in XML.</span></div></div>
<pre id="out"></pre>
The best way to do it using server side as client side doesn't work well in all scenarios. I was trying to build online json to xml and xml to json converter using javascript and I felt almost impossible as it was not working in all scenarios. Ultimately I ended up doing it server side using Newtonsoft in ASP.MVC. Here is the online converter http://techfunda.com/Tools/XmlToJson