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JSON Formatter & Validator

Free JSON formatter and validator — free online JSON beautifier, minifier and syntax validator. Format and validate JSON for free. No registration required. 100% free JSON developer tool.

Instantly format, validate, and minify JSON with full syntax highlighting. Works 100% in your browser — nothing is sent to any server.

JSON Input
Output
Output will appear here after formatting 

            

          

        


      


      
      

        
About JSON Formatter & Validator

        

          JSON (JavaScript Object Notation) is the universal data interchange format for APIs, configuration files, and data storage. This free online tool lets you instantly format messy or minified JSON into readable, indented output and validates it at the same time. The syntax highlighter colour-codes keys, strings, numbers, booleans, and nulls so you can scan large payloads at a glance. Everything runs locally in your browser; your data is never transmitted to any server.
        


        
How to Use

        
    
          
  1. Paste your raw or minified JSON into the input area.
    2. 
          
  2. Click Format (or press Ctrl+Enter) to pretty-print with 2-space indentation.
    3. 
          
  3. Click Minify to compress JSON by removing all whitespace.
    4. 
          
  4. Use Copy to copy the output to your clipboard, then Clear to reset.
    5. 
        


        
Frequently Asked Questions


        

          What is JSON and why do I need a formatter?
          
JSON is a lightweight text format for representing structured data. When JSON is minified (all whitespace removed) for transmission efficiency, it becomes unreadable by humans. A formatter re-adds indentation and line breaks so you can read, debug, or audit the structure easily.

        


        

          Does this tool validate JSON?
          
Yes. When you click Format or Minify, the tool attempts to parse your input using the native JSON.parse() function. If parsing fails, the exact error message is shown in red so you can fix it quickly.

        


        

          Is my JSON data kept private?
          
Absolutely. All processing happens entirely in your browser using JavaScript. No data is sent to any server, logged, or stored anywhere. You can use this tool safely with sensitive API responses or configuration files.

        


        

          What is the difference between Format and Minify?
          
Format (also called "pretty print" or "beautify") adds indentation and newlines to make JSON human-readable. Minify strips all unnecessary whitespace to produce the smallest possible JSON string, which is ideal for sending over a network or storing in a database.

        


        

          What do the syntax highlight colours mean?
          
Keys are shown in cyan, string values in green, numbers in orange, booleans (true/false) in purple, and null in red. These colours follow popular code-editor conventions for quick visual scanning.