Strip every unnecessary space and line break from JSON to get the smallest valid version — or expand it back to readable form. Runs in your browser, nothing uploaded. Free, no account needed.
Paste formatted JSON and get the compact single-line version for config files, embedded data, API bodies and localStorage. Validation happens at the same time, so invalid input is flagged instead of silently mangled.
Runs locally in your browser; nothing is sent to a server.
Typically 20–40 % for indented documents; the saving is all whitespace, the data is unchanged.
No. Keys, values and order stay identical; only whitespace outside strings is removed.
JSON Validator · JSON Formatter & Validator (all features)
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