Does it support trailing commas?

Yes, trailing commas before } or ] are automatically removed.

What about single-quoted strings?

Single-quoted strings are converted to properly escaped double-quoted JSON strings.

Can it handle functions or non-JSON values?

No, the input must be a plain data literal — functions, undefined, and symbols aren't valid JSON.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

JavaScript Object to JSON

Convert a JS object literal into strict, valid JSON.

Support

Works Offline

Privacy First

No Login

No API

JavaScript object literal

Strict JSON

{
  "name": "Ada Lovelace",
  "age": 28,
  "skills": [
    "math",
    "logic"
  ],
  "active": true
}

About the JavaScript Object to JSON

Paste a JavaScript object or array literal — with unquoted keys, single quotes, comments, or trailing commas — and convert it into strict, standards-compliant JSON.

Examples

Unquoted keys

{ name: 'Ada', age: 28 }

Output

{"name":"Ada","age":28}

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

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Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser