JavaScript to JSON Converter

About JavaScript to JSON Converter

JavaScript to JSON Converter is a browser-based developer tool for converting JavaScript object-style and configuration-style data into standard JSON. It is designed for situations where data has been written using JavaScript syntax but needs to be stored, exchanged, or consumed as JSON.

The converter works with data-like JavaScript structures rather than arbitrary executable JavaScript programs. Your input is processed locally in the browser, and the converter does not need to execute the supplied code.

What Is JSON?

JSON, or JavaScript Object Notation, is a text-based data format commonly used for APIs, configuration files, application data, and communication between software systems. JSON uses a strict syntax for objects, arrays, strings, numbers, booleans, and null values.

Although JSON syntax is closely related to JavaScript object syntax, the two formats are not identical. For example, JSON requires object property names to use double quotes, while JavaScript object literals can use unquoted identifier-style property names.

JavaScript Object Syntax vs JSON

A JavaScript object can contain syntax that is not permitted by the JSON specification. For example, comments, trailing commas, single-quoted strings, and unquoted identifier-style keys can appear in JavaScript-style data.

JSON is intentionally more restrictive because it is designed as a predictable data interchange format. The converter normalizes supported JavaScript-style syntax before generating the final JSON.

Example

A JavaScript-style object may look like this:

{
    name: 'John',
    age: 30,
    active: true,
    address: {
        city: 'Dhaka'
    },
}

The converter can transform the supported syntax into standard JSON such as:

{
  "name": "John",
  "age": 30,
  "active": true,
  "address": {
    "city": "Dhaka"
  }
}

How To Use

1. Paste a JavaScript object or configuration-style data structure into the input area.
2. Choose whether you want formatted JSON.
3. Enable key sorting if you want object properties sorted recursively.
4. Keep Convert unquoted object keys enabled when your input contains keys such as name or price without quotes.
5. Click Convert to JSON .
6. Review, copy, or download the generated JSON.

Supported JavaScript-Style Data

The converter is intended for plain data structures that can be represented by JSON. Supported input can include:

• Objects and nested objects.
• Arrays and nested arrays.
• Strings using single or double quotes.
• Identifier-style unquoted object keys.
• Boolean values such as true and false.
• The null value.
• JSON-compatible numbers.
• JavaScript-style line and block comments.
• Trailing commas in supported objects and arrays.
• Simple declarations such as const data = {...}.

JavaScript to JSON Conversion Limitations

Not every JavaScript program can be converted into JSON. JSON describes data; it does not describe executable program logic.

The following JavaScript features are not valid JSON data and are not executed by this converter:

• Functions.
• Variables used as values.
• Function calls.
• Expressions that require JavaScript execution.
• undefined.
• NaN.
• Infinity.
• Dates and other JavaScript objects requiring custom serialization.
• Template literals and dynamic expressions.
• Executable statements.

Privacy and Security

Conversion is performed in your web browser. The converter does not use eval() or Function() to execute the supplied JavaScript. This is important because arbitrary JavaScript execution could create unnecessary security risks.

Even though processing happens locally, you should still avoid pasting passwords, private keys, authentication tokens, API secrets, or other highly sensitive information into any online tool.

Features

• Convert JavaScript-style objects to JSON.
• Convert nested objects and arrays.
• Support single and double quoted strings.
• Convert unquoted identifier-style object keys.
• Remove supported JavaScript comments.
• Handle supported trailing commas.
• Format JSON with readable indentation.
• Sort object keys recursively.
• Copy JSON output.
• Download JSON as a file.
• Show input and output statistics.
• Browser-side processing.
• No registration required.

Pros and Cons

Pros	Cons
Runs directly in the browser	Does not convert arbitrary executable JavaScript
No JavaScript execution required	JavaScript-specific values such as undefined are not valid JSON
Supports common object-style syntax	Dynamic expressions require manual conversion
Formatting, sorting, copying and downloading included	Intended for data-like structures rather than complete JavaScript applications

Frequently Asked Questions