Beautify, minify, validate, auto-fix, schema-correct — and convert JSON to TypeScript, CSV, YAML or XML. 100% in your browser, nothing sent to any server.
Paste your JSON Schema and click Fix with Schema — the tool will coerce each value to the correct type automatically.
"25" → 25"yes" → true1042 → "1042"2.1.0 → "2.1.0"enum — wrong value, can't guess which is correctminimum/maximum — out of range, your intent unclearminLength/maxLength — can't rewrite your stringpattern — can't construct a valid valueadditionalProperties — unknown keys flaggedrequired — missing fields flagged5 buttons, each for a different task
Paste any valid JSON and click to get clean, properly indented output with syntax highlighting. Use the indent selector (2 or 4 spaces) before clicking.
Strips all whitespace and indentation. Use before sending JSON to an API or saving to a database to reduce payload size.
Checks if your JSON is syntactically correct without modifying it. Shows a green tick if valid — or a red error with the exact line and column if not.
Automatically repairs trailing commas, single quotes, missing commas, unquoted keys, Python literals (True/False/None). Then runs data analysis.
When your JSON has the right structure but wrong types, Schema Fix reads your JSON Schema and corrects every value automatically.
FAQ
Everything you need to know about formatting and validating JSON online.
A JSON formatter takes raw or minified JSON and reformats it with proper indentation and line breaks, making it easy to read and debug. It also validates the JSON structure and highlights syntax errors.
Yes, completely. GetPDFMint's JSON formatter is 100% client-side. Your data never leaves your browser and is never sent to any server. You can safely paste API keys, config files, and sensitive data.
Formatting adds indentation and line breaks to make JSON human-readable. Minifying removes all whitespace to reduce file size — useful for production APIs and config files where bandwidth matters.
Common errors detected include trailing commas, missing quotes around keys, single quotes instead of double quotes, mismatched brackets, and invalid data types. The tool pinpoints the exact line and character of each error.
Yes. Since all processing happens in your browser, there are no server upload limits or timeouts. You can format large JSON files directly without any restrictions.
Yes. The formatter handles all valid JSON structures including deeply nested objects, arrays of objects, mixed types, and complex hierarchies. The tree view helps visualize nested structures at any depth.
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