Input JSON
Formatted Output
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Size
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Status
Format, validate, and minify JSON instantly. Free, private — nothing leaves your browser.
The JSON Formatter pretty-prints, minifies, and validates JSON, turning a cramped or broken API response into readable, indented structure — and telling you exactly where a syntax error is.
It's a daily driver for developers working with APIs, config files, and data pipelines.
The tool parses your input against the JSON grammar; if it's valid, it re-serialises it with consistent indentation (or removes all whitespace to minify). If it's invalid, the parser reports the location and nature of the error so you can fix it fast.
Parsing and formatting happen locally, so you can safely format payloads containing tokens or personal data without uploading them.
Paste a one-line API response and the formatter expands it into indented, readable structure; introduce a missing comma and it points you straight to the offending position.
Yes — invalid JSON produces a clear error at the problem location.
Yes — it both pretty-prints and compacts JSON.
No — all parsing happens in your browser, so sensitive data stays local.
It focuses on formatting and validation; key order is preserved.
Yes — 25 languages, free.