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Trouble handling nested JSON data

I have a JSON data and i'm having trouble with one nested object. You can see there is two metadata object, my aim is to get image link.
obj.metadata.url
is working, but this isn't work.
obj.metadata.metadata.image
what am i missing here?
{
"tokenId": "0",
"metadata": {
"url": "https://gateway.pinata.cloud/ipfs/QmSnTNGbhD/0",
"metadata": {
"name": "Illuminati #0",
"image": "https://gateway.pinata.cloud/ipfs/QmW8pAhkNr/5499.png",
"attributes": [
{
"trait_type": "Background",
"value": "Stained Glass"
},
{
"trait_type": "Frames",
"value": "Stained Glass"
}
]
},
"tokenId": "0"
}
}

From your question it seems that you are dealing with JSON data instead of JavaScript objects. In order to get the attributes of JSON, you will first need to parse the JSON using JSON.parse(), then you can use . to get the properties you want.
data = {
"tokenId": "0",
"metadata": {
"url": "https://gateway.pinata.cloud/ipfs/QmSnTNGbhD/0",
"metadata": {
"name": "Illuminati #0",
"image": "https://gateway.pinata.cloud/ipfs/QmW8pAhkNr/5499.png",
"attributes": [
{
"trait_type": "Background",
"value": "Stained Glass"
},
{
"trait_type": "Frames",
"value": "Stained Glass"
}
]
},
"tokenId": "0"
}
};
obj = JSON.parse(data);
console.log(obj.metadata.url)
// 'https://gateway.pinata.cloud/ipfs/QmSnTNGbhD/0'
console.log(obj.metadata.metadata.image);
// 'https://gateway.pinata.cloud/ipfs/QmW8pAhkNr/5499.png'

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
}
}
}

What is the best way to replace text in json?

So I have a bunch of JSON data and it contains a few fields. for example:
[{
"id": "XXX",
"version": 1,
"head": {
"text": "Main title",
"sub": {
"value": "next"
},
"place": "secondary"
},
"body": [{
"id": "XXX1",
"info": "three little birds",
"extended": {
"spl": {
"text": "song",
"type": {
"value": "a"
}
}
}
},
{
"id": "XXX2",
"info": [
"how are you?"
],
"extended": {
"spl": {
"text": "just",
"non-type": {
"value": "abc"
}
}
}
}
]
}]
what I'm trying to do is kind of conversion table (from a different JSON file)
if a field has the value 'a' replace it with 'some other text..' etc.
I have a service for the JSON pipeline, so I guess this is the right place to do the replacement.
so for this example, I have the JSON above and in my conversion table I have the following terms:
next: forward,
song: music,
a: option1,
just: from
etc...

What you are looking for can be achieved with templates. Replace the variable sections with some specific markers that you can find and replace from some external tools such as perl or sed.
For example, you could have a template.json with something like this:
...
"type": {
"value": "##VALUE##"
}
...
Then when you need the actual JSON, you could pass this though an intermediate script that replaces these templates with actual data.
cat template.json | sed -e 's/##VALUE##/my_value/' > target.json
Alternatively, with Perl:
cat template.json | perl -pi -e 's:\#\#VALUE\#\#:my_value:' > target.json

The best way is to parse it, replace the text in the object, and then stringify it.
The next best way is to use a regular expression.
In this example, I catch exceptions if path cannot be indexed, and use ['type'] instead of .type so it will scale to indexing 'non-type' if you wish.
const data = `[{
"id": "XXX",
"version": 1,
"head": {
"text": "Main title",
"sub": {
"value": "next"
},
"place": "secondary"
},
"body": [{
"id": "XXX1",
"info": "three little birds",
"extended": {
"spl": {
"text": "song",
"type": {
"value": "a"
}
}
}
},
{
"id": "XXX2",
"info": [
"how are you?"
],
"extended": {
"spl": {
"text": "just",
"non-type": {
"value": "abc"
}
}
}
}
]
}]
`
const o = JSON.parse(data)
o[0].body.forEach(b => {
try {
if (b.extended.spl['type'].value === 'a') {
b.extended.spl['type'].value = 'CHANGED'
}
} catch (e) {}
})
const newData = JSON.stringify(o, null, 2)
console.log(newData)
A string replace approach will work if you know and can rely on your source conforming, such as the only "value" is inside "type"
const data = `[{
"id": "XXX",
"version": 1,
"head": {
"text": "Main title",
"sub": {
"value": "next"
},
"place": "secondary"
},
"body": [{
"id": "XXX1",
"info": "three little birds",
"extended": {
"spl": {
"text": "song",
"type": {
"value": "a"
}
}
}
},
{
"id": "XXX2",
"info": [
"how are you?"
],
"extended": {
"spl": {
"text": "just",
"non-type": {
"value": "abc"
}
}
}
}
]
}]
`
const newData = data.replace(/"value": "a"/g, '"value": "NEWVALUE"')
console.log(newData)

Checking a value in a nested JSON using Postman

I have a nested JSON returned from an API that I am hitting using a GET request, in POSTMAN chrome app. My JSON looks like this
"result": [
{
"_id": "some_id",
"name": "India",
"code": "IN",
"link": "http://www.india.info/",
"closingTime": "2017-02-25T01:12:17.860Z",
"openingTime": "2017-02-25T06:12:17.205Z",
"image": "image_link",
"status": "online",
"serverStatus": "online",
"games": [
{
"_id": "some_game_id1",
"name": "Cricket"
},
{
"_id": "some_another_id1",
"name": "Baseball"
},
{
"_id": "some_another_id_2",
"name": "Basketball"
}
]
},
{
"_id": "some_id",
"name": "Australia",
"code": "AUS",
"link": "https://www.lonelyplanet.com/aus/adelaide",
"closingTime": "2017-02-28T05:13:38.022Z",
"openingTime": "2017-02-28T05:13:38.682Z",
"image": "some_image_url",
"status": "offline",
"serverStatus": "online",
"games": [
{
"_id": "some_game_id_2",
"name": "Cricket"
},
{
"_id": "some_another_id_3",
"name": "Kho-Kho"
},
{
"_id": "some_another_id_4",
"name": "Badminton"
},
{
"_id": "some_another_id_5",
"name": "Tennis"
}
]
},
I am trying to test whether my response body has "name":"India" and the "game" with "some_game_id1" contains the "name":"cricket".
I went through this link where the answer is to have an array for "name"created and then check within the array whether the array contains the value. I tried this but my code fails.
Also, I tried searching the element by the index within the JSON body using this -
var searchJSON = JSON.parse(responseBody);
tests["name contains India"] = searchJSON.result.name[0]==="India";
But this also fails. I tried using the .value appended with the second line of above code, but it also fails. How can I check this thing?

You need to put [0] after result (which is an array) rather than name (which is a string).
Also, use a regular expression to check whether the name contains 'India', because using === only checks if the name is exactly India.
var searchJSON = JSON.parse(responseBody)
tests["name contains India"] = /India/.test(searchJSON.result[0].name)
Demo Snippet:
var responseBody = `{
"result": [{
"_id": "some_id",
"name": "India",
"code": "IN",
"link": "http://www.india.info/",
"closingTime": "2017-02-25T01:12:17.860Z",
"openingTime": "2017-02-25T06:12:17.205Z",
"image": "image_link",
"status": "online",
"serverStatus": "online",
"games": [{
"_id": "some_game_id1",
"name": "Cricket"
},
{
"_id": "some_another_id1",
"name": "Baseball"
},
{
"_id": "some_another_id_2",
"name": "Basketball"
}
]
},
{
"_id": "some_id",
"name": "Australia",
"code": "AUS",
"link": "https://www.lonelyplanet.com/aus/adelaide",
"closingTime": "2017-02-28T05:13:38.022Z",
"openingTime": "2017-02-28T05:13:38.682Z",
"image": "some_image_url",
"status": "offline",
"serverStatus": "online",
"games": [{
"_id": "some_game_id_2",
"name": "Cricket"
},
{
"_id": "some_another_id_3",
"name": "Kho-Kho"
},
{
"_id": "some_another_id_4",
"name": "Badminton"
},
{
"_id": "some_another_id_5",
"name": "Tennis"
}
]
}
]
}`
var tests = {}
var searchJSON = JSON.parse(responseBody)
tests["name contains India"] = /India/.test(searchJSON.result[0].name)
console.log(tests) //=> { "name contains India": true }

How do I console.log one value of this JSON Object?

I am new to javascript and to JSON, so please forgive me.
If I have the following JSON Object, how would I console.log() out the value of autonum?
{
"database": "testdb",
"table": "path",
"affectedColumns": [
{
"name": "autonum",
"charset": null,
"type": 8
},
{
"name": "TimeStamp",
"charset": null,
"type": 18,
"metadata": {
"decimals": 0
}
},
{
"name": "FilePath",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 256
}
},
{
"name": "DirPath",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 256
}
},
{
"name": "DirName",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 256
}
},
{
"name": "EventName",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 256
}
},
{
"name": "FileName",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 256
}
},
{
"name": "FileExt",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 10
}
},
{
"name": "FileSize",
"charset": null,
"type": 3
},
{
"name": "MainFlag",
"charset": null,
"type": 1
},
{
"name": "DeleteFlag",
"charset": null,
"type": 1
},
{
"name": "Status",
"charset": "latin1",
"type": 15,
"metadata": {
"max_length": 255
}
},
{
"name": "ProcessedFlag",
"charset": null,
"type": 1
}
],
"changedColumns": [],
"fields": {
"autonum": 121,
"TimeStamp": "2016-01-13T00:21:13.000Z",
"FilePath": "c:/1E0304F120151223030158001.mp4",
"DirPath": "c:\\",
"DirName": null,
"EventName": null,
"FileName": "1E0304F120151223030158001.mp4",
"FileExt": ".mp4",
"FileSize": 2218108,
"MainFlag": 0,
"DeleteFlag": 0,
"Status": null,
"ProcessedFlag": 0
}
}

Depending on which autonum you want, and assuming your variable storing the JSON is data, you'll want to do something as follows:
console.log(data.fields.autonum);
or
console.log(data.affectedColumns[0].name);

You'd use the following code, assuming the json object is called record:
console.log(record.fields.autonum);

You have two main ways of doing it. Both are correct ways. Lets say your object is named obj. Use console.log as following:
console.log(obj.fields.autonum)
console.log(obj['fields']['autonum'])
First case is easier as compare to second case.
Second case is safer as it will allow you to even take care of keys which have spaces e.g.
var my_other_object = {
'Santa Clara': 'USA',
'Toronto': 'Canada'
};
console.log(my_other_object['Santa Clara']) // Output will be 'USA'
For your understanding, in above object 'Santa Clara' and 'Toronto' are called 'keys' of my_other_object and 'USA', 'Canada' are called 'values' of those 'keys'.
So JSON object is essentially combination of key:value pairs.
P.S. Never apologize while asking a question all questions are valid but it is good to always search before asking. Still, people are always happy to help here. We all have went through same phases. :)

Lets say your object name var data, then data.fields.autonum would give us value 121
console.log(data.fields.autonum)
Just FYI:
As it is stated on MDN website:
some JavaScript is not JSON, and some JSON is not JavaScript
Just in order to improve understanding of vocabulary, 'JSON Object' is not a thing in our context ... it is
a syntax for serializing objects