JSON Formatter
Free online JSON Formatter.
Calculator
How to Use
- Enter the required values
- Click Calculate to see the result
- Review the detailed output
Formula
JSON structure: objects {} with key:value pairs, arrays [] with ordered values. Keys must be double-quoted strings. Values: strings, numbers, booleans, null, objects, arrays.
Example Calculations
Format Object
Input: {"name":"John","age":30,"city":"NYC"}
Result: Pretty-printed with 2-space indentation
Nested Data
Input: {"users":[{"id":1},{"id":2}]}
Result: Formatted with proper nesting and indentation
Validate JSON
Input: Input with trailing comma error
Result: Error detected: trailing comma at line 3
About This Calculator
Free online json formatter. Calculate instantly in your browser with our easy-to-use tool. No sign-up required.
Our json formatter is free, easy to use, and provides instant results. All calculations are performed in your browser for privacy and speed.
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Frequently Asked Questions
What is JSON?
JavaScript Object Notation: lightweight data format with key-value pairs and arrays. Human-readable.
What does a JSON formatter do?
Adds indentation and line breaks for readability. Can validate syntax and highlight errors.
Validate JSON?
Must have double-quoted keys/strings, proper commas, matching braces. Common error: trailing commas.
JSON vs XML?
JSON: lighter, key-value pairs, preferred for APIs. XML: tags, attributes, common in enterprise.
Arrays and nested objects?
Yes, JSON supports arrays (square brackets) and nested objects for complex structures.