JSON Formatter & Validator
Paste your JSON to format, validate, or minify it instantly.
How to Format JSON Online
- 1Paste your raw or minified JSON into the input field on the left.
- 2Choose your preferred indentation (2 spaces, 4 spaces, or tab).
- 3Click "Format" to beautify your JSON, or "Minify" to compress it into a single line.
- 4The formatted result appears in the output field. Click "Copy Output" to copy it to your clipboard.
- 5If your JSON contains syntax errors, a clear error message will tell you exactly what went wrong.
Features
✓Instant JSON formatting with syntax validation
✓Minify JSON to reduce file size
✓Configurable indentation (2 spaces, 4 spaces, or tabs)
✓Real-time error messages for invalid JSON
✓Copy formatted output to clipboard with one click
✓100% client-side — your data never leaves your browser
✓Works with large JSON files
✓No sign-up or installation required
Frequently Asked Questions
What is JSON?▼
JSON (JavaScript Object Notation) is a lightweight data interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. JSON is commonly used for APIs, configuration files, and data storage.
What does a JSON formatter do?▼
A JSON formatter takes raw or minified JSON and adds proper indentation and line breaks to make it human-readable. It also validates the JSON structure and reports any syntax errors.
Is my data safe?▼
Yes. This tool runs entirely in your browser using JavaScript. No data is sent to any server. Your JSON stays on your machine.
What is the difference between formatting and minifying?▼
Formatting adds indentation and line breaks for readability. Minifying removes all unnecessary whitespace to reduce the size of the JSON, which is useful for production APIs and storage optimization.
Can I format large JSON files?▼
Yes. Since the processing happens in your browser, you can format JSON files of any reasonable size. For very large files (50MB+), performance may depend on your device.