JSON Formatter & Validator
Paste messy JSON and instantly format it with proper indentation, or minify it for production use. The tool validates your JSON in real-time, showing clear error messages for syntax issues. All processing happens locally in your browser — nothing is sent to any server, making it safe for sensitive data.
About JSON Formatter
- Format — Pretty-print JSON with configurable indentation
- Minify — Remove all whitespace for smaller payloads
- Validate — Instantly detect syntax errors with clear messages
- All processing happens locally in your browser — nothing is sent to any server
How to Use
- 1
Paste Your JSON
Paste raw, messy, or minified JSON into the input field.
- 2
Choose an Action
Select "Format / Beautify" for readable output or "Minify" to compress it.
- 3
Set Indentation
When formatting, choose 2 spaces, 4 spaces, or tab indentation.
- 4
Copy the Result
Click the copy button to copy the formatted or minified JSON to your clipboard.
Examples by Niche
{"users":[{"id":1,"name":"John","email":"john@example.com"},{"id":2,"name":"Jane","email":"jane@example.com"}]}
{"compilerOptions":{"target":"ES2020","module":"ESNext","strict":true,"outDir":"./dist"},"include":["src/**/*"]}
{"name":"my-app","version":"1.0.0","scripts":{"dev":"astro dev","build":"astro build"},"dependencies":{"astro":"^5.0.0"}}
Frequently Asked Questions
Is my JSON data safe?
Yes, all processing happens entirely in your browser. No data is ever sent to our servers or any third party.
What is the maximum JSON size I can format?
There is no hard limit, but very large files (over 10MB) may cause your browser to slow down. For most use cases, the tool handles JSON instantly.
What is the difference between formatting and minifying?
Formatting (beautifying) adds indentation and line breaks to make JSON human-readable. Minifying removes all unnecessary whitespace to reduce file size for production use.
Can this tool fix invalid JSON?
The tool validates and shows you exactly where the error is, but it cannot auto-fix invalid JSON. You will need to correct the syntax based on the error message.
What is JSON formatting?
JSON formatting adds indentation and line breaks to make JSON human-readable.
What size JSON can I format?
No hard limit, but files over 10MB may slow your browser.
Format vs minify?
Formatting adds whitespace for readability. Minifying removes it for production.
Can this fix invalid JSON?
Shows exact error location, but cannot auto-fix the syntax.
Is this tool free?
Yes, completely free with no usage limits.
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