LLM JSON Repairer

Paste JSON that a model returned but that won't parse. The tool fixes the common LLM failure modes, shows valid pretty-printed JSON, and lists every repair it applied.


          

        


        

          
          
          
          
          
        


        
        


        
      


      

        What it fixes: markdown code fences around the JSON, leading or trailing prose ("Here is the JSON: ..."), trailing commas, single-quoted keys and strings, unquoted keys, Python literals (True / False / None), smart quotes, comments (// and /* */), raw newlines inside strings (best effort), missing closing brackets and braces, and several JSON values concatenated back to back (wrapped into one array). Valid JSON passes through untouched, it is only pretty-printed. Everything runs locally in your browser; nothing you paste is uploaded anywhere.
      


      
Free tool from AI School - no signup, runs in your browser.