Format, validate, beautify, and minify JSON instantly. Paste or upload your JSON and view it as a collapsible tree. 100% free, no registration, fully browser-based.
All formatting and validation happen locally in your browser. No data is uploaded or stored.
Instant JSON validation with precise error index mapped to line and column for quick fixes.
Switch to Tree view to explore nested JSON with collapsible nodes using a clean, readable layout.
Paste JSON into the editor or upload a .json/.txt file. Drag & drop is supported.
Set indentation size, enable key sorting, and toggle live validation as needed.
Click Format or Minify, then copy or download the result. Explore structure in Tree view.
JSON Formatter & Validator is a free online tool to beautify, validate, and minify JavaScript Object Notation (JSON). It helps developers and users quickly inspect and correct JSON by providing pretty printing, error locations, key sorting, and a collapsible tree viewer.
| Feature | Our Tool | Traditional Tools |
|---|---|---|
| Validation | β Error index β line & column | β Vague error messages |
| Beautify/Minify | β Indent: 2/4/Tabs | β Fixed formatting only |
| Key Sorting | β Recursive sort | β Limited or absent |
| Viewer | β Collapsible tree | β Flat output |
| Privacy | β 100% Browser-Based | β Server Upload Required |
| Use Case | Benefits | Notes |
|---|---|---|
| π API Debugging Inspect API responses |
Pretty print & validate | Find malformed JSON quickly |
| βοΈ Config Files Edit app settings |
Beautify & sort keys | Improves readability |
| π§ͺ Test Data Craft fixtures |
Minify for storage | Consistent formatting |
| π Documentation Example payloads |
Clean, readable JSON | Copy & download easily |
Your privacy is our priority. All processing occurs locally in your browser using JavaScript. No JSON is uploaded, stored, or transmitted.
Check for trailing commas, unquoted keys, or single quotes. The error index maps to the exact line and column.
For very large JSON, prefer Tree view and disable live validation to improve responsiveness.
Ensure input is UTF-8. Convert other encodings to UTF-8 before formatting.
You might also consider:
Convert tabular data to JSON
Transform JSON objects to rows
Clean and structure plain text
Quickly jump to related developer and data tools to continue your workflow without leaving the site.
Important: This tool is provided as-is for personal and commercial use. While we strive for accuracy, please verify formatted data before use in production environments.