JSON Formatter
A powerful JSON editor with instant validation, beautify/minify controls, tree viewer, error fixing, and one-click copy/export. Everything happens in your browser—no server upload required.
JSON Tool
Valid
Input179 chars
Invalid JSON
Instant Validation
Real-time error detection and fixing
Tree Viewer
Collapsible structure with search
Format Controls
Beautify, minify, flatten & more
Export Options
Copy, download as JSON or TXT
Why Use This JSON Formatter?
API Development
Perfect for testing API responses, debugging REST APIs, and formatting JSON payloads with instant validation.
Configuration Files
Edit and validate configuration files like package.json, tsconfig.json, and more with error highlighting.
Data Analysis
Explore complex JSON structures with tree view, search functionality, and path navigation.
Privacy First
All processing happens in your browser. Your JSON data never leaves your device.
Supported Features
Real-time Validation
Beautify (2 or 4 spaces)
Minify JSON
Fix JSON Errors
Sort Keys A-Z
Flatten JSON
Expand JSON
Tree Viewer
Search & Filter
Duplicate Key Detection
Strict/Loose Mode
Undo/Redo (20 steps)
Auto-save
Copy to Clipboard
Download .json/.txt
Sample Presets
Dark Mode
Auto-format on Paste