JSON Formatter
Beautify, minify, and inspect JSON with error reporting.
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All 93 toolsWhat is the JSON Formatter?
A JSON formatter beautifies, minifies, and validates JSON so you can actually read and trust it. Paste a wall of compact JSON from an API response or a config file, click beautify, and get clean, indented, properly nested output in an instant — or minify it back down to a single line for production. If the JSON is malformed, the tool tells you what broke instead of failing silently.
Developers reach for this constantly: API payloads arrive minified, log lines bury JSON in noise, and a single missing comma or stray trailing bracket can derail an afternoon. Formatting makes structure visible, and validation pinpoints the exact problem so you stop hunting character by character.
Critically, your JSON never leaves your browser. Many online formatters send your data to a server — this one does all parsing and formatting locally, so you can safely paste payloads that contain tokens, internal IDs, or customer data.
How to format JSON
- 1
Paste your JSON — minified, messy, or hand-written — into the input box.
- 2
Click Beautify to get indented, human-readable output, or Minify to collapse it to a single compact line.
- 3
If the JSON is invalid, read the error message: it describes what went wrong so you can find the missing comma, quote, or bracket.
- 4
Copy the formatted result and drop it straight into your code, ticket, or documentation.
Why developers use a JSON formatter
Beautify and minify
Switch between readable indented JSON and compact single-line output with one click.
Real validation
Invalid JSON returns a clear parse error instead of silently producing nothing.
Local and secure
Parsing happens in your browser, so tokens, IDs, and customer data never hit a server.
Copy-ready output
Formatted results are one click from your clipboard and ready to paste anywhere.
Formatting, minifying, and validating JSON
JSON (JavaScript Object Notation) is the default data format for web APIs because it is both human-readable and easy for machines to parse. Beautifying it adds consistent indentation and line breaks so nested objects and arrays are easy to scan; minifying strips all of that whitespace to shrink the payload for faster transfer in production. This tool does both using the browser's native JSON engine, so the output is spec-correct.
Validation is the other half of the job. JSON has strict rules that trip people up: keys and strings must use double quotes, no trailing commas are allowed, and comments are not part of the standard. When parsing fails, the error message points you toward the offending spot — often a missing quote, an extra comma before a closing bracket, or an unescaped character inside a string.
If you only need a yes/no answer on whether a document is valid, the dedicated JSON validator gives a focused check. For other formats, the XML formatter and XML validator do the same job for XML, and the Base64 and JWT tools help when your data is encoded rather than plain.