DeveloperLocal processing
JSON Formatter
Paste JSON for auto-formatting, syntax highlighting, and error line hints
Input JSON
Formatted Result
Formatted result will appear here
About This Tool
JSON Formatter is a free online tool. Format and validate JSON All processing runs locally in your browser — files are never uploaded to any server, keeping your data private.
Use Cases
- Format JSON, YAML, TOML, SQL, and XML for API debugging
- Encoding, hashing, JWT decode, AES crypto, and security tasks
- Regex, JSONPath, IP, Cron, and other developer utilities
- Run locally — configs and secrets never leave your device
How to Use
- Step 1
Paste JSON text in the left panel
- Step 2
See formatted output on the right automatically
- Step 3
Errors are highlighted with line numbers
- Step 4
One-click copy of formatted JSON
Frequently Asked Questions
- Is JSON Formatter free?
- Yes, completely free with no registration required and no usage limits.
- Are my files uploaded to a server?
- No. JSON Formatter processes everything locally in your browser. Your data never leaves your device or gets uploaded to any server.
- Which browsers are supported?
- Chrome, Firefox, Safari, Edge, and other modern browsers. We recommend using the latest version for the best experience.
- How do I use JSON Formatter?
- 1. Paste JSON text in the left panel 2. See formatted output on the right automatically 3. Errors are highlighted with line numbers 4. One-click copy of formatted JSON