Stringify JSON

JavaScript and JSON look similar, but they are not the same thing. A JavaScript object literal uses unquoted keys and single quotes — {name: 'Ana'} — while JSON demands strict double-quoted syntax. Stringify JSON bridges the gap: paste your JavaScript data and get a valid JSON string back, ready for APIs, storage and configuration.

The tool parses JavaScript object and array literals with a small built-in parser (no eval), then re-emits them as proper JSON with your choice of indentation. It is ideal for converting quick test fixtures, config snippets and copy-pasted examples into the strict JSON your tools expect. All parsing happens locally in your browser, so nothing is sent anywhere.

• JavaScript to JSON: accepts unquoted keys, single quotes and trailing commas in the input.
• Automatic wrapping: no need to wrap objects or arrays in parentheses yourself.
• Configurable indentation: 2-space or 4-space output to match your style.
• Strict valid output: the result parses cleanly with JSON.parse.
• Clear error reporting: invalid JavaScript expressions are explained instead of failing silently.
• Copy or download: grab the JSON string or save it as a file.
• CSP-safe: parsing uses a hand-written parser, not eval or new Function.

1. Paste your JavaScript data — an object literal, array or scalar.
2. Choose the indentation for the JSON output.
3. Copy or download the resulting JSON string.

Example 1 — Test fixtures. You wrote a config as a compact JS object in a comment; convert it to JSON so a test loader can read it.

Example 2 — API contracts. Turn a mock JavaScript object into the exact JSON your API endpoint should return.

Example 3 — Migrating examples. Documentation and Stack Overflow answers often use JavaScript syntax; stringify it into strict JSON for your application.

• Bridge the syntax gap — from JavaScript literals to strict JSON.
• Faster fixture creation — no manual quote fixing.
• Consistent output — valid JSON every time.
• Time saved — skip rewriting examples by hand.
• Free and private — runs locally, no uploads, no eval.