Developer utilities

JSON Formatter

Format, minify, validate and analyze JSON locally with optional auto-fix and query features.

Ready in browser
No install
Fast, private, and responsive on desktop and mobile.

CSV ↔ JSON Converter

Convert between CSV and JSON formats locally in your browser with flexible delimiter and format options.

Max 10 MB. Supported: CSV, JSON 

  



        

  

    

      

        
JSON Formatter

        
Format, minify, validate and analyze JSON locally with optional auto-fix and query features.

      

    


    

      

        
        
        

          
          Local only. Max 10 MB.
        

        
      


      

        
        

          
          
          
          
          
          
          
          
          
          
        


        

          
          
        


        

          
          
        


        

          
          
        


        

          
          
        


        

          
          
        

      

    


    

      
      
      
      
    


    
    


    

      
Frequently Asked Questions

      

        

          

            
          

          

            
No. Formatting and validation happen locally in your browser.

          

        

        

          

            
          

          

            
Formatting preserves JSON values when the input is already valid. If you enable Auto-fix for invalid JSON, some repairs can change type, such as converting a leading-zero literal like 001 to the string "001" to make it valid JSON.

          

        

        

          

            
          

          

            
Yes, for safe syntax issues such as trailing commas, missing commas between values, unquoted object keys, hexadecimal, leading-zero, and leading-fraction numeric literals, invalid backslash escapes in strings and Windows paths, non-JSON literals like NaN or undefined, escaped literal newlines in strings, and common bracket mismatches. It will not guess missing semantic data.