JSON Formatter & Validator
Format, validate, and minify JSON. See parse errors with line and column numbers, sort keys alphabetically, and choose the indent size — all offline in your browser.
Paste any JSON to instantly see whether it parses, then format it with two-space, four-space, or tab indentation. Toggle “Sort keys” to produce a stable diff-friendly output. Switch to Minify to strip every byte of whitespace before sending the payload over the wire. Validation errors are displayed with the exact line and column so you can jump straight to the broken comma or unmatched brace.
Everything runs locally in your browser — no JSON ever leaves your machine.