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JS. How to collect each required element from an array

I am making a tokenizer that builds an abstract tree and I want to collect all the "text" from an array that is output by my tokenizer.
Output:
{
"error": false,
"tokens": [
{
"type": "keyword",
"value": "print",
"text": "print"
},
{
"type": "string",
"value": "hello world",
"text": "hello world"
},
{
"type": "keyword",
"value": "var",
"text": "var"
},
{
"type": "keyword_valueof",
"value": "msg",
"text": "msg"
},
{
"type": "operator",
"value": "eq",
"text": "="
},
{
"type": "string",
"value": "secret message",
"text": "secret message"
}...
It should turn out like this:
print "hello world"
var msg = "secret message"
Can you help me, I don't know how to do this.

If you want to extract each value of the "text" to an array, you can use the map() method:
const arr = obj.tokens.map((token) => token.text);
Where 'obj' is the main object (with the "errors" and "tokens" keys).
To print each element of the array in a new line:
arr.forEach(elem => {console.log(elem);});
e.g.:
const obj = {
"error": false,
"tokens": [
{
"type": "...",
"value": "...",
"text": "text 1"
},
{
"type": "...",
"value": "...",
"text": "text 2"
}
]
}
const tokensArr = obj.tokens.map(token => token.text);
tokensArr.forEach(elem => {console.log(elem);});

Is this what you're looking for?
let array = ["secretMessage", "anotherMessage"]; //The array
let theNumberIdOfMessage = 0; //The first item of the array
console.log(array[theNumberIdOfMessage]); //Get the item first in the array and log it
theNumberIdOfMessage = 1; //The second item of the array
console.log(array[theNumberIdOfMessage]); //Log the second item

How do you delete an empty array from javascript?

For reference I have zero javascript knowledge or any coding knowledge. I typically just hook up applications via IPASS applications that don't require any coding knowledge. However, I found out I need to inject some javascript into the application in order to avoid an error message.
I have the below JSON record.
I need to get rid of the empty array (sorry... if it is not an array but an object? Like I said, no javascript knowledge).
In the below code essentially what I want is to completely delete this line, because there is nothing inside the brackets and it is causing errors:
"lineitemsdata": []
Full JSON record below for reference
"id": "5399286500",
"properties": {
"state": "AB",
"website": null,
"zip": "T3B5Y9"
},
"createdAt": "2021-02-18T22:13:06.111Z",
"updatedAt": "2021-05-17T14:35:09.540Z",
"archived": false,
"associations": {
"deals": {
"results": [
{
"id": "5230410841",
"type": "company_to_deal"
}
]
}
},
"dealdata": [
{
"id": "5230410841",
"properties": {
"hs_lastmodifieddate": "2021-05-13T14:00:33.101Z",
"hs_object_id": "5230410841",
"hubspot_owner_id": "52200226"
},
"associations": {
"line items": {
"results": [
{
"id": "1468189759",
"type": "deal_to_line_item"
},
{
"id": "1468189760",
"type": "deal_to_line_item",
"lineitemsdata": []
}
]
}
}
}
],
"DealOwner": [
{
"id": "52200226",
"email": "email#email.com",
"firstName": "Bob"
}
],
"NetSuiteCustomerID": 1745
}

Item inside object is called a property. If you (for some reason) have to include the property, but don't want it to have any value you can either set it's value to null or undefined.

I suspect I'm going to get criticized for this, but here is a quick and dirty way of removing this specific problem through string replacement. The 'right' way would be to break down your json into separte objects until you get to the level where the offending object lives, remove it, then rebuild it all back. For what it's worth, here's an alternative to that
let json = {
"id": "5399286500",
"properties": {
"state": "AB",
"website": null,
"zip": "T3B5Y9"
},
"createdAt": "2021-02-18T22:13:06.111Z",
"updatedAt": "2021-05-17T14:35:09.540Z",
"archived": false,
"associations": {
"deals": {
"results": [{
"id": "5230410841",
"type": "company_to_deal"
}]
}
},
"dealdata": [{
"id": "5230410841",
"properties": {
"hs_lastmodifieddate": "2021-05-13T14:00:33.101Z",
"hs_object_id": "5230410841",
"hubspot_owner_id": "52200226"
},
"associations": {
"line items": {
"results": [{
"id": "1468189759",
"type": "deal_to_line_item"
},
{
"id": "1468189760",
"type": "deal_to_line_item",
"lineitemsdata": []
}
]
}
}
}],
"DealOwner": [{
"id": "52200226",
"email": "email#email.com",
"firstName": "Bob"
}],
"NetSuiteCustomerID": 1745
}
json = JSON.stringify(json)
let strstart = json.indexOf('"lineitemsdata":[]');
let commapos = json.lastIndexOf(',', strstart);
json = json.substr(0, commapos) + " " + json.substr(commapos + 1);
json = json.replace('"lineitemsdata":[]', '');
json = JSON.parse(json)
console.log(json)

You can use this to strip any empty lineitems arrays from your json.
Assuming the reference to your record is json
for(dealIdx in json.dealdata) {
for (resultIdx in json.dealdata[dealIdx].associations["line items"].results) {
let lineItemsData = json.dealdata[dealIdx].associations["line items"].results[resultIdx].lineitemsdata
if (lineItemsData != undefined && lineItemsData.length === 0 ) {
delete json.dealdata[dealIdx].associations["line items"].results[resultIdx].lineitemsdata
}
}
}

How could one define the exact data types at any level of a nested object / array data-structure?

I am trying to define a "complex" object:
var tM = JSON.parse('{"version":"","series":[{"name":"","possModes":[],"instance":[{"date":"","mode":""}]}]}');
where all items of array "instance" should be objects of type
{"date":"","mode":""}
and all items of array "series" should be objects of type
{"name":"","possModes":[],"instance":[{"date":"","mode":""}]}
The problem is that only the items of index [0] are getting the proper properties and items of higher indexes are "undefined", so I cannot set them to their needed values.
I have also tried to define tM explicitly, like:
var Cinstance = new Object();
Cinstance.date = "";
Cinstance.mode = "";
var Cseries = new Object();
Cseries.name = '';
Cseries.possModes = [];
Cseries.instance = [new Object(Cinstance)];
var tM= new Object();
tM.version = "";
tM.series = [new Object(Cseries)];
and also like:
var tM = {series:
[{instance:
[{date:"",mode:""}
]
}
]
}
(this is a version reduced to my specific problem).
Of course, they both end up with the same result - only items of index [0] are defined.

The data structure provided by the OP ...
{
"version": "",
"series": [{
"name": "",
"possModes": [],
"instance": [{
"date": "",
"mode": ""
}]
}]
}
... does validate against the following JSON schema ...
{
"$schema": "http://json-schema.org/draft-07/schema#",
"title": "My-Special-Schema-Or-Data-Structure-Title",
"description": "Whatever I have to say about my described structure",
"type": "object",
"properties": {
"version": {
"description": " ... ",
"type": "string"
},
"series": {
"description": " ... ",
"type": "array",
"minItems": 1,
"items": {
"description": " ... ",
"type": "object",
"properties": {
"name": {
"type": "string"
},
"possModes": {
"description": " ... ",
"type": "array"
},
"instance": {
"description": " ... ",
"type": "array",
"minItems": 1,
"items": {
"description": " ... ",
"type": "object",
"properties": {
"date": {
"type": "string"
},
"mode": {
"type": "string"
}
},
"required": [
"date",
"mode"
]
}
}
},
"required": [
"name",
"possModes",
"instance"
]
}
}
},
"required": [
"version",
"series"
]
}
There is even a JSON Schema Generator one could start with. Passing the OP's originally provided data structure, one gets a solid base of a JSON Schema, one then can continue tailoring.

JSONSchema and validating sub-object properties

Given this JSON object:
{
"objects": {
"foo": {
"id": 1,
"name": "Foo"
},
"bar": {
"id": 2,
"name": "Bar"
}
}
}
This is an object containing sub objects where each sub object has the same structure - they're all the same type. Each sub-object is keyed uniquely, so it acts like a named array.
I want to validate that each object within the objects property validates against a JSON Schema reference.
If the objects property was an array, such as:
{
"objects": [
{
"id": 1,
"name": "Foo"
},
{
"id": 2,
"name": "Bar"
}
]
}
I could validate this with a schema definition such as:
{
"id": "my-schema",
"required": [
"objects"
],
"properties": {
"objects": {
"type": "array",
"items": {
"type": "object",
"required": [
"id",
"name"
],
"properties": {
"id": {
"type": "integer"
},
"name": {
"type": "string"
}
}
}
}
}
}
This is achieved because the type is array, and this permits the validation of items.
Is it possible to do something similar, but with nested objects?
Thanks!

You can try something like this:
{
"id": "my-schema",
"type": "object",
"properties": {
"objects": {
"type": "object",
"patternProperties": {
"[a-z]+": {
"type": "object",
"properties": {
"id": {
"type": "integer"
},
"name": {
"type": "string"
}
},
"additionalProperties": false,
"required": [
"id",
"name"
]
}
}
}
}
}

The above answer works for restricting the object property names to lower-case letters. If you do not need to restrict the property names, then this is simpler:
{
"id": "my-schema",
"type": "object",
"properties": {
"objects": {
"type": "object",
"additionalProperties": {
"type": "object",
"properties": {
"id": {
"type": "integer"
},
"name": {
"type": "string }
}
},
"required": [
"id",
"name"
]
}
}
}
}
I omitted the inner "additionalProperties": false from the above answer because I find that using that keyword causes more problems than it solves, but it is a valid use of the keyword if you want validation to fail on the inner objects if they have properties other than "name" and "id".

getJSON displays [object Object] rather than actual values

I have a JSON and I need to get this JSON and put in the html as a ul li list. It gets the value as object and displays [object Object] in html. If I modify the json then it works. so there is probably something wrong in my script where I am not able to loop throught he json file properly. Can some one help please:
MY JSON IS:
[
{
"us":"USA"
},
{
"fr":"FRANCE"
},
{
"es":"Spain"
},
{
"sa":"South Africa"
}
]
AND JS IS
<script>
$.getJSON('jsonfile', function(data) {
var items = [];
$.each(data ,function(key,val) {
items.push('<li id="'+ key +'">' + val +'</li>');
});
$('<ul />' , {
'class':'new-div',
html:items.join('')
}).appendTo('body');
});
</script>
UPDATED JSON:
[
{
"items":
{
"item":
[
{
"id": "0001",
"type": "donut",
"name": "Cake",
"ppu": 0.55,
"batters":
{
"batter":
[
{ "id": "1001", "type": "Regular" },
{ "id": "1002", "type": "Chocolate" },
{ "id": "1003", "type": "Blueberry" },
{ "id": "1004", "type": "Devil's Food" }
]
},
"topping":
[
{ "id": "5001", "type": "None" },
{ "id": "5002", "type": "Glazed" },
{ "id": "5005", "type": "Sugar" },
{ "id": "5007", "type": "Powdered Sugar" },
{ "id": "5006", "type": "Chocolate with Sprinkles" },
{ "id": "5003", "type": "Chocolate" },
{ "id": "5004", "type": "Maple" }
]
}
]
}
}
]

The data you're looping over is the array, which has objects. So your key will be 0, 1, etc., and the val will be the object at that position in the array.
Your JSON structure actually makes it a bit of a pain to output, because each of your objects only has one property, but the property name varies from object to object. You can do it, by looping over the object properties even though there's only one of them:
var items = [];
$.each(data ,function(outerKey, outerVal) { // <== Loops through the array
$.each(outerVal, function(key, val) { // <== "Loops" through each object's properties
items.push('<li id="'+ key +'">' + val +'</li>');
});
});
...but I'd change the JSON structure instead. For instance, assuming the keys are unique, your original code would work with this structure:
{
"us":"USA",
"fr":"FRANCE",
"es":"Spain",
"sa":"South Africa"
}