javascript

JS Object to JSON Converter

Convert JavaScript object literals to valid JSON instantly

JavaScript Object

JSON Output

About JS Object to JSON Converter

Free JS to JSON converter. Paste a JavaScript object literal with single quotes, unquoted keys, or trailing commas and get valid, formatted JSON output.

How to Use

1Paste your JavaScript object literal into the input editor
2The valid JSON output appears automatically
3Switch to the JSON→JS tab to go the other direction
4Copy the result with the Copy button

Frequently Asked Questions

What is the difference between a JS object and JSON?+

JSON is a strict subset of JavaScript. JSON requires double-quoted keys and string values, no trailing commas, and no undefined, NaN, or Infinity values.

What transformations does this tool apply?+

It quotes unquoted keys, converts single quotes to double quotes, removes trailing commas, strips comments, and replaces undefined/NaN/Infinity with null.

Why does my JS object fail to convert?+

Complex expressions, function values, or template literals cannot be converted to JSON. JSON only supports strings, numbers, booleans, null, arrays, and objects.

Can I convert JSON back to a JS object?+

Valid JSON is already valid JavaScript. Use the JSON-to-JS tab to pretty-print JSON as a JavaScript value.

Is this tool safe to use with sensitive data?+

Yes. All processing happens locally in your browser. Nothing is sent to a server.

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Last updated: January 2025