JSON Formatter & Validator
Pretty-print, minify, or validate JSON with live feedback.
About this tool
Clean up API responses, config files, and log snippets. Format with indentation, compress to one line, or check whether a string is valid JSON.
What you get
- Pretty-printed JSON with 2-space indent
- Minified single-line JSON
- Validation verdict and parse errors
How to use
Pick Pretty, Minify, or Validate, paste JSON, and copy the formatted output or read the validation result.
FAQ
How to pretty print JSON online?
Select Pretty mode, paste minified or messy JSON, and copy the indented output with consistent 2-space formatting.
How to validate JSON syntax online?
Choose Validate and paste your text. You get a pass/fail verdict plus the exact line or token where parsing fails.
How to minify JSON to one line?
Use Minify mode to strip whitespace and newlines, producing a compact single-line string for logs, URLs, or storage.
How to fix invalid JSON errors?
Run Validate first to locate trailing commas, unquoted keys, or mismatched brackets, fix the snippet, then format again.
By using this tool you agree to our Terms of Use and Privacy Policy. Results are provided as-is without warranty.