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JSON Formatter & Validator

Format, validate, and beautify your JSON data with syntax highlighting.

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Overview
Format and validate JSON so it is readable and safe to use.
Best for
  • Pretty-print API responses for debugging.
  • Check config files before deployment.
  • Prepare JSON snippets for documentation.
Step-by-step
  1. Paste your JSON input.
  2. Choose indentation or sorting options.
  3. Copy the formatted output.
Examples

        
Example 1

        

          

            
Input

            
{"name":"Acme","count":3,"tags":["a","b"]}

          

          

            
Output

            
{"name": "Acme", "count": 3, "tags": ["a", "b"]}

          

        

        
Same data, clearer formatting.

      

        
Example 2

        

          

            
Input

            
{"price":"12.50","priceNum":12.5}

          

          

            
Output

            
{"price":"12.50","priceNum":12.5}

          

        

        
Check types: quotes make strings.

      

        
Example 3

        

          

            
Input

            
{"env":"prod","retries":3,"flags":{"beta":false}}

          

          

            
Output

            
{"env": "prod", "retries": 3, "flags": {"beta": false}}

          

        

        
Nested objects become easier to scan.

      
Common mistakes
  • Trailing commas or comments break strict JSON.
  • Numbers in quotes become strings.
  • Large integers can lose precision in JavaScript.
Pro tips
  • Use consistent indentation (2 or 4 spaces).
  • Validate before committing to version control.
FAQ
Does formatting change the data?
No, it only changes whitespace (and order if you enable sorting).
Does this upload my data?
No. Everything runs locally in your browser.
Can I use it offline?
Yes. After the page loads, most tools work offline. Some assets (like fonts) may need a connection.
Data & privacy
All processing happens locally in your browser. No data is uploaded or stored.