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Iterate through array of objects using javascript

I am trying to iterate through the array of objects but somehow not getting it right. Can somone please let me know where i am going wrong.
Here is the data
const response = {
"pass": 1,
"fail": 2,
"projects_all": [
{
"projects": [
{
"name": "Project1",
"current": null,
"previous": {
"environment": "qa4nc",
"status": "UNKNOWN",
}
}
]
},
{
"projects": [
{
"name": "Project2",
"current": null,
"previous": {
"environment": "qa4nc",
"status": "FAIL",
}
},
{
"name": "Project3",
"status": "LIVE",
"current": null,
"previous": {
"environment": "qa4nc",
"status": "UNKNOWN",
}
}
]
}
]
}
And here is the code i tried
if(response) {
response?.projects_all?.forEach((projects) => {
projects.forEach(project) => {
if(project.previous !== null) {
//do something here
}
});
});
}
I am trying to iterate through this array of objects but it says projects not iterable. Any help is appreciated to make me understand where i am going wrong.

You were missing iterating over an array properly. A good idea is to format the JSON object that you plan to iterate over. So that you can see what are the arrays and objects, and at what hierarchy.
if (response) {
response?.projects_all?.forEach((project) => {
project?.projects?.forEach((project) => {
console.log(project?.name);
});
}
);
}

response?.projects_all?.forEach((projects) => {
This is the exact correct way to start the code. The problem that happens next is you apparently misunderstand what projects means in the following context
You do projects.forEach(project) as if you think projects is as array. projects is not an array at this point, it is an object that looks like this:
{
"projects": [
{
"name": "Project1",
"current": null,
"previous": {
"environment": "qa4nc",
"status": "UNKNOWN",
}
}
]
}
So I would actually want to do projects.projects.forEach(project => { ... }), or you could change the variable name from projects so it makes more sense to read.

First, determine what shape your response object currently has.
By using the ?. operator your essentially muting JS built in error reporting.
From the context, I assume your response actually looks like this:
console.log(response);
{
data: {
projects_all: [ ... ]
}
}
Therefore your existing code using response?.projects_all doesn't actually hit the projects_all property inside your response.
Can you try the following:
response.data.projects_all.forEach((project) => {
console.info("Project: ", project);
project.projects.forEach((project) => {
console.log(project, project?.name);
});
});
Alternatively, if you don't have a data key inside your response object, you can omit it in the loop:
response.data.projects_all.forEach((project) => {
console.info("Project: ", project);
project.projects.forEach((project) => {
console.log(project, project?.name);
});
});

Construct a JSON Payload in javascript

I have to construct a JSON payload that looks like this, can someone help me? I am able to get the straight forward one but unable to build a nested payload. How do I go about adding more nested keys, one inside the other. Also some of the keys and values are dynamic and have to replaced with variables.
{
"format_version": "0.2.19",
"alliances": {
"xyz": {
"environments": {
"prd": {
"teams": {
"abc": {
"action": "edit",
"team": "abc",
"projects": {
"prjabc": {
"project": "prjabc",
"cost_center": "0",
"custom_iam_policies": [],
"iam": {
"view_group_email_name": "abc#email.com",
"sre_admin_group_email_name": "xyz#email.com"
},
"allowed_apis": [
"api1",
"api2"
],
"networks": {
"network1": {
"flags": [
"VM"
],
"region": "sample-region",
"preferred-suffix": "routable"
}
}
}
}
}
}
}
}
}
}
}

Let say you have an object as such
items = {
foo: "bar",
something: "useful"
}
and if you wanted to add other properties or add nested object you can do so like this
subitems = { name: "Johnson" };
items['subitem'] = subitems;
After you've added and finalized the object, you can just use JSON.stringify(items) to convert your object into "payload"

How to access Json Data?

Can anybody help me to get data from the json below.I have get a json data in the format below and in this json you can see that there is "{0}" in each record.So my question is how i can get data from this format or is there any way to remove "{0}" from the json.
[{
"ChkValue": "ChkValue",
"Description": "Description",
"Mode": "Mode"
}, {
"0": {
"ChkValue": "false",
"Description": "Made sure guards are in place on machine",
"Mode": "Eliminate"
}
}, {
"0": {
"ChkValue": "false",
"Description": "Use Liveguard at electrical source2",
"Mode": "Isolate"
}
}, {
"0": {
"ChkValue": "false",
"Description": "Wear ear-muffs when using machine",
"Mode": "Isolate"
}
}]

This is a basic javascript object traversal problem.
To access the data inside the second object (that says "Made sure guards are in place..."), you would do:
jsonObj[1]["0"].Description

You can use the JSON.parse() function to work with it in JS.

user JSON.parse() to iterate over JSON
FIDDLE
var a = '[{"ChkValue":"ChkValue","Description":"Description","Mode":"Mode"},{"0":{"ChkValue":"false","Description":"Made sure guards are in place on machine","Mode":"Eliminate"}},{"0":{"ChkValue":"false","Description":"Use Liveguard at electrical source2","Mode":"Isolate"}},{"0":{"ChkValue":"false","Description":"Wear ear-muffs when using machine","Mode":"Isolate"}}]';
var b = JSON.parse(a);
for(var i = 0; i < b.length; i++) {
if(typeof b[i]["0"] != "undefined") {
console.log(b[i]["0"].ChkValue);
console.log(b[i]["0"].Description);
console.log(b[i]["0"].Mode);
}
}

Use list[index][0]
var list = [
{
"ChkValue": "ChkValue",
"Description":"Description",
"Mode":"Mode"
},
{
"0": {
"ChkValue":"false",
"Description":"Made sure guards are in place on machine",
"Mode":"Eliminate"
}
},
{
"0": {
"ChkValue":"false",
"Description":"Use Liveguard at electrical source2",
"Mode":"Isolate"
}
},
{
"0": {
"ChkValue":"false","Description":"Wear ear-muffs when using machine",
"Mode":"Isolate"
}
}
];
console.log(list[1][0].ChkValue); // get "false"

Accessing JavaScript Sub-properties by Name

I wrote the following JavaScript function (part of a larger "class") to help ensure anybody using the object stores attribute values in the "values" property.
function _updateAttributes(attribute, value) {
_attributes[attribute] = { values: { value: value }};
}
It works fine for a flat structure, but falls apart when I start trying to use it for sub-properties.
After running the following code:
myEntity.updateAttribute('name', 'Frankenstein');
myEntity.updateAttribute('name.source', 'John Doe');
I'd like the following structure:
{
"attributes": {
"name": {
"values": {
"value": "Frankenstein"
},
"source": {
"values": {
"value": "JohnDoe"
}
}
}
}
}
Instead, it's coming out like this:
{
"attributes": {
"name": {
"values": {
"value": "Frankenstein"
}
},
"name.source": {
"values": {
"value": "JohnDoe"
}
}
}
}
Is there any clean way to write this JavaScript or will I be faced with splitting out the strings and manually building the structure?
NOTE: I realize even the preferred structure is a little odd, but there's a Java object I'm mapping to that expects this format, so I don't have any options here.

You'll have to parse the string (parse is a bit strong, just a single split('.') with a loop).
But frankly, the cleaner way would simply be:
myEntity.name = {values: 'Frankenstein'};
myEntity.name.source = {values: 'John Doe'};

Trimming JSON while retaining node structure and arrays

How can I trim everything from my JSON except for a few properties I specify at different levels, while keeping my node structure and array structure?
I've looked into Underscore.js and it seems like it doesn't have as much fine-grained control for preserving the node structure. In the example below, ideally, I would like to be able to specify '_id', 'revisions[0]._id', 'revisions[0]._clientHasViewed' as arguments to keep those properties.
Surely there's an easy way to do this. Here's what I'm looking for:
ORIGINAL
{
"_id": "50cbf5214ffaee8f0400000a",
"_user": "50b1a966c12ef0c426000007",
"expenses": [],
"name": "Untitled Project",
"payments": [],
"revisions": [
{
"_id": "50cbfae65c9d160506000007",
"clientHasViewed": false,
"comments": [],
"dateCreated": "2012-12-15T04:21:58.605Z"
},
{
"_id": "50cbfae65c9d160506000008",
"clientHasViewed": false,
"comments": [],
"dateCreated": "2012-12-15T04:21:58.605Z"
}
],
"status": "Revised",
"thumbURL": "/50cd3107845d90ab28000007/thumb.jpg"
}
TRIMMED
{
"_id": "50cbf5214ffaee8f0400000a",
"revisions": [
{
"_id": "50cbfae65c9d160506000007",
"clientHasViewed": false,
},
],
}

ExtJs has a copyTo function (only one level), but you could create something similar with AngularJs (angular has angular.copy, but that copies the whole object):
var copyTo = function(dest, source, names){
names = names.split(/[,;\s]/);
angular.forEach(names, function(name){
if(source.hasOwnProperty(name)){
dest[name] = source[name];
}
});
return dest;
};
E.g.
var trimmed = copyTo({}, original, '_id,');
trimmed.revisions = [{}];
trimmed = copyTo(trimmed.revisions[0], original.revisions[0], '_id,_clientHasViewed,');