JSON Formatter & Validator — Free Online Tool
Format, validate and beautify JSON data — free developer tool.
How to Use JSON Formatter
Paste your JSON data
Click Format to beautify or Validate to check
Copy the formatted output
Your files never leave your browser
No upload wait time. Results in seconds
No daily limits, no file count limits
No account, no subscription, no fees
About JSON Formatter
JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. Whether you're debugging an API response, configuring a package.json, or inspecting webhook payloads, properly formatted JSON is essential for readability and error detection.
Features
- Format/Beautify: Pretty-print JSON with configurable indentation (2 or 4 spaces)
- Minify: Compress JSON into a single line for production use
- Validate: Instant syntax error detection with position reporting
- Copy & Paste: One-click copy output to clipboard
Common JSON Issues
The most frequent JSON errors are trailing commas, single quotes instead of double quotes, and unquoted keys — all of which are caught instantly by the validator with specific position info.
Frequently Asked Questions
Can this tool minify JSON too?
Yes — switch between formatted (pretty-printed) and minified output with one click.