JSON Formatter & Validator - Format, validate, and minify JSON data with syntax highlighting and error detection. Perfect for developers working with APIs and configuration files.

Example: Paste {"name":"John","age":30} and click Format to get a properly indented, validated JSON structure with syntax highlighting.

JSON Formatter & Validator

Input JSON

Output

 
 
 
 
Frequently Asked Questions
 
 
What is JSON?
 
JSON (JavaScript Object Notation) is a lightweight data-interchange format that's easy for humans to read and write, and easy for machines to parse and generate.
 
 
 
What does JSON validation check?
 
JSON validation checks for proper syntax including: correct bracket matching, proper string quotes, valid data types (string, number, boolean, null, array, object), no trailing commas, and proper escape sequences.
 
 
 
Common JSON errors and how to fix them:
 
     
  • Missing quotes: All strings must be wrapped in double quotes (")
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  • Trailing commas: Remove commas after the last item in objects/arrays
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  • Single quotes: JSON only allows double quotes for strings
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  • Undefined values: Use null instead of undefined
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  • Comments: JSON doesn't support comments
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Benefits of formatting JSON:
 
     
  • Improved readability with proper indentation
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  • Easier debugging and error spotting
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  • Better understanding of data structure
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  • Consistent formatting across teams
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  • Easier to find and edit specific values
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When should I minify JSON?
 
Minify JSON when you need to reduce file size for transmission over networks, store data more efficiently, or when human readability is not required (e.g., in production APIs).
 
 
 
What's the difference between JSON and JavaScript objects?
 
JSON is a text format with stricter rules: requires double quotes for strings, doesn't support functions or undefined values, and keys must be strings. JavaScript objects are more flexible but not universally portable.