JSON Formatter & Validator
Paste your JSON to format, validate, or minify it instantly. Catches errors and shows exactly where they are.
How to Use This JSON Formatter
- Paste or type your JSON in the input area
- Click Format to beautify or Minify to compress
- Errors appear instantly with line and position info
- Click Copy to copy the result to your clipboard
What This Tool Does
- Format/Beautify — Adds proper indentation (2 or 4 spaces) so nested objects and arrays are easy to read
- Validate — Checks if your JSON is syntactically correct and pinpoints errors with line numbers
- Minify — Strips all whitespace and newlines for the smallest possible file size, ideal for API payloads and config files
Why Formatting JSON Matters
Raw JSON from APIs and databases is often minified — a single line of text that is nearly impossible to read. Properly formatted JSON with indentation makes it easy to spot nested structures, find specific keys, and debug issues. Validation catches syntax errors like trailing commas, missing quotes, and mismatched brackets before they cause runtime failures in your application.
Frequently Asked Questions
Is my data safe?
Yes. Everything runs in your browser using JavaScript. No data is sent to any server, and nothing is stored or logged.
What JSON errors does it catch?
Missing commas, trailing commas, unquoted keys, mismatched brackets and braces, invalid values, duplicate keys, and malformed Unicode escape sequences.
Can I use this for large JSON files?
This tool handles files up to several megabytes comfortably in modern browsers. For very large files (50MB+), consider using a desktop tool like VS Code or jq.