JSON Formatter & Validator

Format, validate, and pretty-print JSON instantly in your browser. Your data stays on your device—nothing is uploaded.
Input JSON
Runs in your browser
Tip: paste any JSON — the output updates instantly.
Formatted output

          

        

      


    


    

      Privacy note: we don’t upload your content anywhere — formatting happens locally.
    

            
          

                  
What this JSON formatter does

          
This tool formats (pretty-prints) and validates JSON so it is easier to read, review, and debug. It helps you spot missing quotes, trailing commas, and mismatched braces in seconds. Processing runs in your browser, so your JSON is not uploaded.

                  
When to use it

          
Use it when working with API responses, logs, configuration files, or documentation. Clean formatting improves readability for nested objects and arrays and reduces editing mistakes.

                  
Common errors and quick fixes

          
If you see an error, check for trailing commas, unescaped quotes inside strings, or missing brackets. JSON does not allow comments. If your input is JavaScript object notation, convert it to strict JSON before validating.

              

    
          

        
How to format JSON

                  
Paste JSON and get a formatted output.

                          
    
                          
  1. Paste your JSON into the input box.
    2. 
                          
  2. The formatted output appears below.
    3. 
                          
  3. Copy the formatted JSON when ready.
    4. 
                      

              

    
          

        
FAQ

                  

            Does this tool send my data to a server?
            
No. Formatting runs in your browser.

          

                  

            Why is my JSON invalid?
            
Look for missing quotes, trailing commas, or unescaped characters.