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JSON Formatter & Validator

Beautify, minify, and validate JSON instantly — runs entirely in your browser, nothing is uploaded anywhere.

Input
Output

      
Paste JSON on the left to get started.

    

  






  
Want this formatted JSON saved for later? We'll email it to you.

  

    
    
    

  






  
How to Use the JSON Formatter

  

    
1
Paste Your JSON
Paste raw or minified JSON into the input box on the left.

    
2
Format or Minify
Beautify for readability, or minify to strip whitespace for production.

    
3
Check the Status Bar
Invalid JSON shows the real parse error and where it happened.

    
4
Copy the Result
One click copies the formatted or minified output.

  






  
Frequently Asked Questions

  
Does this tool send my JSON anywhere?
No — formatting and validation both run entirely in your browser using JavaScript's built-in JSON parser. Nothing you paste is sent to a server, which matters if the JSON contains real data you'd rather not upload anywhere.

  
What's the difference between formatting and minifying?
Formatting (beautifying) adds indentation and line breaks to make JSON readable by a human. Minifying strips all unnecessary whitespace to make the file as small as possible — the right choice for production payloads where file size matters more than readability.

  
Why does my JSON fail validation?
The most common causes are a trailing comma after the last item in an object or array (not allowed in strict JSON), missing quotes around a key, or using single quotes instead of double quotes for strings. The error message shown includes the position where parsing actually failed.






  
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