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100% Client-Side Developer Utility

JSON Formatter, Validator & Beautifier

Format, indent, validate, and debug JSON data instantly in your browser. Features syntax error detection with line numbers, custom indent spacing, minification, and zero server logging.

Input Raw JSON 0 chars
Formatted Output 0 chars

Understanding JSON (JavaScript Object Notation)

JSON is an open standard file and data exchange format that uses human-readable text to transmit data objects consisting of attribute–value pairs and arrays. Derived from the ECMAScript programming language standard, JSON is completely language-independent and universally supported across modern APIs, web services, and databases.

Valid JSON Data Types
String: "Enclosed in double quotes"
Number: Integer or floating-point (e.g. 42, 3.1415, -10)
Object: Key-value pairs {"key": "value"}
Array: Ordered lists [1, 2, "three"]
Boolean: true or false (all lowercase)
Null: null (representing empty value)

Common JSON Syntax Pitfalls

  • Single Quotes: JSON specification strictly forbids single quotes ('key': 'value'). Keys and strings must always be double quoted ("key": "value").
  • Trailing Commas: Commas after the last element in an object or array (e.g. {"a": 1,}) will cause strict JSON parsing to fail.
  • Unquoted Object Keys: Unlike JavaScript object literals, all keys in standard JSON must be enclosed in double quotes.
  • Special Numbers: NaN, Infinity, and undefined are invalid in JSON.

Frequently Asked Questions

No. All JSON formatting, minification, and validation occurs entirely inside your web browser using native JavaScript JSON.parse() and JSON.stringify(). Not a single byte is sent over the network.
When an invalid JSON string is parsed, the validator extracts the character position from the browser engine's exception message, computes the exact line and column number, and displays clear debugging guidance.
Privacy Commitment: Zero network transmission. 100% Client-Side browser sandboxed execution.
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