- Strings need double quotes.
- No trailing commas.
- Keys must be quoted.
- Use null, not undefined.
How to use the JSON Formatter
Paste your raw JSON into the left panel and click Format. Your JSON is validated and beautified with proper indentation. Use Minify to compress it for production. If there are errors, the line number is highlighted.
Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight format for storing and exchanging data. It uses key-value pairs and is readable by both humans and machines. It is the most common format for API responses.
Common JSON errors include missing commas between items, trailing commas after the last item, using single quotes instead of double quotes, and missing closing brackets. Our formatter highlights the line with the error.
Pretty-printed JSON has indentation and line breaks making it easy to read. Minified JSON removes all whitespace making the file smaller — better for sending over a network. Use pretty-print for development and minify for production.
No. JSON formatting happens entirely in your browser using JavaScript. Your data never leaves your device.