JSON Formatter
Paste any JSON and instantly get a clean, indented, syntax-highlighted version — with clear error messages if it's invalid.
How to use JSON Formatter
- 1Paste or type your JSON into the editor.
- 2Click Format to beautify it, or Minify to compress it to a single line.
- 3If the JSON is invalid, the error message shows the line and reason.
- 4Copy the result or download it as a .json file.
About JSON Formatter
Minified or poorly-indented JSON is hard to read and debug. This formatter parses your JSON, checks it's valid, and re-prints it with consistent indentation and syntax highlighting so you can quickly scan the structure.
Benefits
- • Instantly spot syntax errors with precise line numbers instead of guessing.
- • Turn minified API responses into a readable structure for debugging.
- • Works entirely in your browser — nothing you paste is sent to a server.
Common mistakes
- • Using trailing commas or single quotes, which are valid in JavaScript objects but not in strict JSON.
- • Forgetting that JSON keys must always be double-quoted strings.
Frequently Asked Questions
No. Formatting and validation happen entirely in your browser using JavaScript — your data never leaves your device.
Formatting adds indentation and line breaks for readability. Minifying strips all unnecessary whitespace to produce the smallest possible file size.
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