What types of JSON errors does this validator detect?

The validator detects all JSON syntax errors including missing commas, unclosed brackets, invalid escape sequences, trailing commas, and incorrect data types. It provides exact line and column numbers for each error.

What is the difference between formatting and minifying JSON?

Formatting (beautifying) adds proper indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size for production use or API transmission.

Is this JSON validator free to use?

Yes, this JSON validator and formatter is completely free with no usage limits. It runs entirely in your browser, so your data stays private.

JSON Validator & Formatter

Paste JSON to validate instantly. If it’s valid, beautify it into a clean readable format. If it’s invalid, you’ll get a clear line and column reference.

data_object JSON Input

Paste JSON or upload a .json file.

upload_file Upload

Invalid JSON

Tips

JSON keys and string values must use double quotes (")
Trailing commas are not allowed in JSON
Use Format to pretty-print valid JSON, or Minify to compact it