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Paste raw JSON or drop a file — get a clean, indented result in one click. Format and minify JSON free, directly in your browser. Works offline — your data is never sent to any server.
Paste or upload your JSON
Paste raw JSON into the input editor, or drag and drop a .json file anywhere on the page — files up to 5 MB are supported.
Set the indent size for formatted output
Use the − / + stepper to choose an indent from 1 to 8 spaces to match your project's code style.
Click Format or Minify
Format pretty-prints the JSON with indentation. Minify strips all whitespace for the most compact output — useful for reducing API payload size.
Fix syntax issues if needed
If the JSON cannot be formatted, check for common issues like trailing commas, missing quotes or unescaped characters.
Copy or download the formatted result
Click Copy to send the formatted output to your clipboard, or click the download icon to save it as a .json file.
No. All processing runs locally in your browser using JavaScript. Your JSON is never transmitted to any server. The tool works offline and your data stays entirely on your device.
Format adds newlines and indentation to make JSON human-readable. Minify removes all whitespace to produce the most compact output — useful for reducing API payload size and storage footprint.
Common causes are a trailing comma after the last item, a missing closing bracket or quote, or an unescaped special character inside a string.
The tool accepts files up to 5 MB. Files over 1 MB show a performance warning — JSON.parse on large payloads can take several hundred milliseconds on slower devices.
No. The formatter uses the native browser JSON.parse, which strictly follows RFC 8259 / ECMA-404. JSON5, JSONC and trailing commas are not supported.
Drag & drop a .json file anywhere on this page