Free JSON formatter & validator — pretty-print, minify, and catch JSON syntax errors with clear messages.
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All formatting happens locally — your JSON never leaves your browser.
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The QuickToolz JSON Formatter & Validator pretty-prints messy JSON, minifies it for transport, and validates syntax with clear error messages pointing to the exact line and column of any problem. Paste JSON from APIs, logs, or config files and instantly get a clean, indented, syntax-highlighted view.
Pretty-print JSON with 2, 4, or tab indentation
Minify to remove all whitespace for compact transport
Validate with line/column error pointers
Sort keys alphabetically (optional)
API responses, logs, and config files often arrive as compact, unreadable JSON. Formatting them into a readable shape makes debugging dramatically faster. Validation catches the trailing-comma, mismatched-quote, and unescaped-character bugs that JSON parsers reject.
Everything you need, nothing you don’t. Built for speed and simplicity.
Format JSON with 2/4-space or tab indent, or minify.
Invalid JSON shows the line, column, and likely cause.
Alphabetize object keys for diff-friendly output.
Everything you need, nothing you don’t. Built for speed and simplicity.
Drop raw JSON from an API response, log, or config.
Got questions? We’ve got answers. Common questions about JSON Formatter & Validator.
Your JSON is parsed locally — never sent anywhere.
Pretty-print, minify, or validate — all instant.
Grab the cleaned-up JSON with one click.