JSON Formatter & Validator

Beautify and validate JSON, or minify it down to one line. Errors are reported with a clear message so you can find the problem fast — all in your browser.

Format, validate, and minify

Format pretty-prints your JSON with two-space indentation so it’s easy to read. Minify strips every unnecessary space and newline to produce the smallest valid JSON, handy for shrinking API payloads. Either way, the tool first parses your input, so if anything is malformed you get an error pointing at the problem.

Common JSON mistakes

Strict JSON is stricter than most people expect. These all make it invalid:

• Trailing commas after the last item in an object or array
• Single quotes — keys and strings must use double quotes
• Unquoted object keys
• // or /* */ comments, which JSON doesn’t allow

Everything is parsed locally in your browser with the native JSON engine — your data never leaves your device, so it’s safe to paste private payloads.

Frequently asked questions

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