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JavaScript Object to JSON Converter

Convert JavaScript objects, obj literals, and JS data to valid JSON with AI — free, instant, no login required.

JavaScript objects and JSON look similar but have key differences — JSON requires double-quoted keys and does not support functions or undefined values. JS2TS handles the conversion including edge cases like single-quoted strings and trailing commas that JSON.stringify() cannot process.

input language

Paste your code, then click Convert

output language

JSON

How to use this tool?

This online converter harnesses AI to seamlessly convert your Javascript Object code to JSON code in just a click of a button. Follow these steps to make the most of this advanced converter:

  1. Type or paste your Javascript Object code into the input box provided. You can directly enter your code or copy it from your favourite code editor.
  2. Initiate the conversion process by clicking on the "Convert" button
  3. Instantly view the transformed JSON code in the output box. The AI-powered converter ensures accurate and efficient conversion.

Example: Simple Function

Javascript Object

{
  name: "John",
  age: 30,
  car: null
}
down arrow

JSON

{
  "name": "John",
  "age": 30,
  "car": null
}

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Js2ts

How to Convert a JavaScript Object to JSON

Converting a JavaScript object to JSON manually means using JSON.stringify() — but that strips functions, converts undefined to null, and loses Date objects. For complex objects with circular references or special values, the process gets complicated fast.

The JavaScript Object to JSON converter handles edge cases automatically. Paste any JS object literal and get clean, valid JSON output — with proper escaping, formatting, and type conversion.

Why Convert JS Objects to JSON?

  • →Save API request payloads from JS objects to send as JSON
  • →Debug object structures by converting to readable JSON format
  • →Export JS config objects to JSON config files
  • →Validate that your JS objects serialize to expected JSON shapes

What the JavaScript Object to JSON Converter Handles

Plain object literals
Nested objects and arrays
String, number, boolean values
null and undefined handling
Date object serialization
Formatted JSON output (pretty-print)
Minified JSON output
Special character escaping
Array of objects
Deep nesting
Numeric and string keys
ES6+ object shorthand

Object to JSON: Common Use Cases

API request bodies

Convert JS config objects to JSON before sending via fetch() or axios — JSON.stringify() handles simple objects but the converter catches edge cases like undefined values and circular refs.

Debugging objects

Paste any JS object to get formatted, readable JSON for logging, Slack messages, or issue reports — easier to read than [object Object].

Config file export

Convert JavaScript config objects (webpack, ESLint, tsconfig) to JSON format for tools that require .json files instead of .js configs.

Test fixture generation

Turn JS mock objects into JSON fixtures for Jest, Cypress, or Playwright test data files.

obj to JSON: What JSON.stringify() Misses

✗Functions — silently omitted from JSON output
✗undefined values — omitted in objects, become null in arrays
✗Symbol keys — silently dropped
✗Circular references — throws TypeError
✗BigInt — throws TypeError
✓AI converter — handles all these cases and explains the output

Frequently Asked Questions

What is the difference between a JavaScript object and JSON?

JavaScript objects can have unquoted or single-quoted keys and support functions, undefined, and comments. JSON requires double-quoted keys, supports only string/number/boolean/null/array/object values, and must be a plain string. This tool handles the conversion including edge cases that JSON.stringify() cannot.

Can the converter handle single-quoted strings?

Yes. Unlike JSON.stringify(), JS2TS handles objects with single-quoted strings, unquoted keys, and trailing commas by normalizing them to valid JSON.

What happens to JavaScript functions in the object?

Functions are not valid JSON values. The converter notes them and removes them from the output, as per the JSON specification.

Is the tool free?

Yes, completely free with no account required.

How do I convert a JavaScript object to JSON?

Paste the JavaScript object literal into the converter and click Convert. The tool outputs valid JSON with proper quoting, escaping, and formatting. Alternatively, use JSON.stringify(obj, null, 2) in your browser console for simple objects.

What is the difference between a JavaScript object and JSON?

JavaScript objects are runtime data structures — keys can be unquoted, values can be functions or undefined, and they can have circular references. JSON is a text format — all keys must be quoted strings, values must be strings/numbers/booleans/null/arrays/objects, and functions are not allowed.

Why does JSON.stringify() return undefined for some values?

JSON.stringify() omits properties with function values, Symbol keys, or undefined values. It converts Date objects to ISO strings, Infinity and NaN to null. The converter handles these cases and shows you the serialized output.

Can I convert a JavaScript class instance to JSON?

Yes, but only the own enumerable properties are included — prototype methods and class methods are excluded (JSON has no concept of methods). The converter outputs the data properties of the object.

How do I convert an array of JavaScript objects to JSON?

Paste the array directly: [{key: "value"}, {key: "value2"}]. The converter produces a valid JSON array with properly quoted keys and values.