JSON Formatter / Validator
Prettify, minify, or validate JSON, with clear error messages when something's wrong.
Paste any JSON and instantly prettify it with proper indentation, minify it to a single compact line, or just validate it and see exactly where a syntax error is if the JSON is broken. This is useful for reading messy API responses, debugging config files, or shrinking JSON before sending it somewhere with a size limit.
How to use it
- Paste your JSON into the input box.
- Click Prettify to format it with indentation, or Minify to compress it.
- If the JSON is invalid, an error message explains what's wrong and roughly where.
- Copy the formatted result.
Frequently asked questions
What happens if my JSON has a syntax error?
The tool shows the exact error message from the JSON parser, which usually points to the character position of the problem — a trailing comma or missing quote, for example.
Does minifying change the data?
No, minifying only removes whitespace and line breaks; the actual keys and values stay identical.
Can it handle very large JSON files?
Yes, though extremely large files (tens of megabytes) may take a moment to parse and render, since it all happens in your browser's memory.