JSON Formatter & Validator
Beautify, minify and validate JSON. Invalid input gets flagged with the exact line and column where the syntax breaks. Compare payload sizes before and after minification, then copy the result or download it as a .json file.
How to use
Paste your JSON
Drop any JSON into the input field — a single line or a fully formatted document.
Beautify or minify
Choose 2 or 4-space indent for readability, or Minify to strip all whitespace.
Fix errors if any
Invalid JSON shows the exact line and column where the syntax breaks.
Copy or download
One-click copy to clipboard, or save the result as a .json file.
Features
Beautify with 2 or 4 spaces
Clean, structured output with your preferred indentation.
Minify into one line
Strip all whitespace to shrink the payload before sending.
Validation with line and column
Pinpoints the exact character where the syntax breaks.
Size comparison before / after
See how much smaller the minified output is, in bytes.
Copy or download output
One-click copy to clipboard, or save the result as a .json file.
Handles large files
Works with files up to a few megabytes — limited only by browser memory.
Common use cases
- Debug an API response returned as one long line
- Find an unbalanced bracket in a config file
- Minify JSON before a build
- Find a missing comma in a deeply nested file
- Validate JSON before sending it