JSON Formatter Online

Validate and pretty-print JSON with readable 2-space indentation.

Local processing: your JSON stays in this browser tab and is not uploaded to JSONyfier.


        


        
Ready. Press Ctrl+Enter or Cmd+Enter to format.


        
        
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What is a JSON formatter?

            
A JSON formatter validates JSON text and adds consistent indentation and line breaks so people can read its structure. JSONyfier uses 2 spaces per nesting level and highlights keys, strings, numbers, booleans, and null values.

            
Formatting is useful for debugging API responses, reviewing configuration, and documenting examples. If you need a compact production payload instead, use the JSON minifier.

            
            
How the formatter works

            
    
                
  1. Validate: the browser parses the input with JavaScript's JSON.parse().
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  2. Pretty-print: valid data is serialized with JSON.stringify(data, null, 2).
    3. 
                
  3. Highlight: the displayed result color-codes JSON token types.
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Important data note

            
Formatting rebuilds the document from JavaScript values. If exact numeric spelling or duplicate object keys must be preserved, keep the original source. For whitespace-only compaction, JSONyfier's minifier operates on the validated source text.

            
See RFC 8259 for the JSON standard, or read our JSON syntax guide.

            
Technical content reviewed by Dynamic Foundries on .