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Tools / JSON Formatter

JSON Formatter

Paste JSON on the left — format, minify, or validate it on the right. Parse errors show line and column.

Runs entirely in your browser
Mode:
Indent:
JSON Input
Formatted Output

How to use JSON Formatter

  1. Paste JSON

    Paste your JSON into the left CodeEditor. The right pane shows the formatted output live.

  2. Pick a mode

    Format pretty-prints, Minify strips whitespace, Validate just reports errors without changing the input.

  3. Choose indentation

    Pick two spaces, four spaces, or tab. Errors include line and column.

  4. Copy or download

    Use the copy button on the output, or download the formatted JSON.

Frequently asked questions

Does this tool upload my JSON?
No. Every parse, transform, and download runs entirely in your browser using JavaScript and Web Workers. The file never leaves your device — there is no upload endpoint and no server-side processing.
Why does the parser flag my trailing comma as an error?
JSON does not allow trailing commas. JSONC and JSON5 do, but they're separate formats — strip the trailing comma to make this strict-JSON tool happy.
Can it handle huge JSON files?
Yes for files that fit in browser memory. JSON parsing is single-pass, so the practical ceiling is similar to other in-browser tools — a few hundred megabytes typically.
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