JSON Formatter
Format (pretty-print), minify, and validate JSON. Syntax errors show the exact line and position.
All processing is client-side — your data never leaves your browser.Formatted JSON will appear here...
About this tool
Format
Pretty-prints JSON with 2-space indentation, making it easy to read and inspect nested objects and arrays.
Minify
Removes all whitespace from JSON, producing the most compact representation. Useful for APIs and storage.
Validate
Syntax errors are caught immediately with the exact message from the JavaScript parser. Paste and know instantly.
Private by design
JSON never leaves your browser. There is no server, no upload, no log. The page works offline after first load.
How to use
- 1Paste your JSON
Type or paste your JSON text into the input box above.
- 2Click Format or Minify
Format adds indentation and line breaks for readability. Minify removes all whitespace for compact transmission.
- 3Copy the result
Use the Copy button to grab the output. The status bar confirms whether your JSON is valid or reports the exact syntax error.
Frequently asked questions
What is JSON formatting?
JSON formatting (or pretty-printing) adds indentation and line breaks to compact API output, making nested objects and arrays easy to read and inspect.
What does "minify" mean?
Minifying removes all whitespace and line breaks from JSON, producing the shortest possible string — ideal for network payloads and storage where every byte counts.
Can this tool validate JSON?
Yes. If your JSON contains a syntax error, the status bar shows the exact error message from the JavaScript parser — so you know what went wrong and roughly where.
Is my JSON data safe?
Completely. All processing runs in your browser using JavaScript. Your JSON is never uploaded to any server and never leaves your device.
What is the maximum JSON file size?
There is no hard limit — only your browser's available RAM. Very large files (hundreds of megabytes) may slow formatting on older devices.