JSON Formatter
Paste raw JSON below, then format or minify it.
About JSON Formatter
The JSON Formatter instantly transforms compact or minified JSON into a readable, indented structure with syntax highlighting. Paste raw API responses, config files, or any JSON data and see it beautifully formatted in one click. The tool also validates your JSON and highlights any syntax errors with helpful messages so you can fix issues quickly.
Whether you're debugging an API, reviewing a configuration file, or just trying to make sense of a blob of data, a properly formatted JSON view saves significant time. This tool runs entirely in your browser — your data never leaves your device.
You can customize indentation levels (2 or 4 spaces) and copy the formatted result instantly. It works with any valid JSON, including deeply nested objects and large arrays.
Features
- ✓Real-time JSON formatting and validation
- ✓Syntax error highlighting with line/column info
- ✓Configurable indentation (2 or 4 spaces)
- ✓One-click copy of formatted output
- ✓Handles deeply nested objects and large arrays
- ✓Runs entirely in-browser — no data sent to servers
Common Use Cases
- →Debugging API responses from REST or GraphQL endpoints
- →Reviewing JSON configuration files (package.json, tsconfig.json)
- →Formatting minified JSON for readability
- →Validating JSON before storing or sending it
- →Teaching or demonstrating JSON structure
Frequently Asked Questions
Does this formatter send my data anywhere?
No. All processing happens in your browser. Your JSON data never leaves your device.
What's the maximum JSON size I can format?
There's no hard limit — performance depends on your browser, but typical API responses and config files format instantly.
Can I format JSON with comments (JSONC)?
Standard JSON does not support comments. If your input contains comments, the validator will report a syntax error. Remove comments first.
Why use a JSON formatter instead of my IDE?
This tool is faster for quick checks — no need to open a file or install plugins. It's ideal for pasting API responses on the fly.