JSON Formatter
Format, validate, minify and convert JSON data online. Supports tree view, JSON to XML/CSV/YAML. Works entirely in browser — no data is sent to any server.
Upload JSON file or drag & drop here
Input JSON
Output
What is JSON Formatter?
JSON Formatter is a free online tool that helps you format, validate, minify and convert JSON data. Supports tree view navigation, JSON to XML/CSV/YAML conversion. All processing is done in your browser — your data never leaves your device.
Features
- Format (Beautify) — Add indentation (2 or 4 spaces) to make JSON readable
- Minify (Compress) — Remove all whitespace to reduce file size
- Validate — Check JSON syntax with exact error location and line number
- Tree View — Collapsible hierarchy display for navigating large JSON
- Format Conversion — Convert JSON to XML, CSV, YAML
- Copy & Download — One-click copy to clipboard or download as file
- File Upload — Load JSON from local file
Common JSON Errors Detected
- Missing commas between elements
- Trailing commas before closing brackets
- Single quotes instead of double quotes
- Unquoted property names
- Missing closing brackets
Tip: Click the "Sample" button to load example JSON and quickly test the formatter.
How to use
- 1. Paste JSON
- 2. Click format or minify
- 3. Fix the reported line/column
Example
`{"a":1}` → indented output with two-space formatting
FAQ
How do I find the error?
The tool reports line and column; usual causes are trailing commas, single quotes or raw newlines.
Is my data uploaded?
No, everything stays in your browser.