NimbleToolKit

Developer Tools

JSON Validator

Paste JSON to check its syntax. See a clear valid or invalid result without sending your input to a server.


      
Common JSON errors
Use double quotes around keys and strings, remove trailing commas, and paste one complete JSON value. The validator displays your browser's syntax error when the input cannot be parsed.

      

        

          
How to validate JSON

          
    
            
  1. Paste a JSON object, array, or other complete JSON value.
    2. 
            
  2. Select Validate JSON to check its syntax.
    3. 
            
  3. If invalid, use the reported error to fix the input and try again.
    4. 
          

        

        

          
Examples

          
{"ok": true} is valid. {"ok": true,} is invalid because the final comma must be removed.

        

      

      

        
Related tools

        
JSON FormatterFormat minified JSON into readable, indented JSON.
CSV to JSON ConverterConvert simple CSV rows into JSON objects in your browser.
JSON to CSV ConverterConvert JSON arrays of objects into CSV data.
Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to plain text.

      

      

        
FAQ

        
Is this tool free?

        
Yes. The core tool is free and works without sign-up.

        
Is my data uploaded?

        
Most tools run directly in your browser. Avoid pasting sensitive information into any online tool unless you trust the environment.