Development
What is JSON?
JavaScript Object Notation — a lightweight text format for data interchange.
JSON (JavaScript Object Notation) is a text-based data format derived from JavaScript object syntax. It stores data as key-value pairs and ordered lists, making it human-readable and easy for machines to parse.
JSON supports six data types: strings, numbers, objects, arrays, booleans (true/false), and null. It is the dominant format for web APIs, configuration files, and data exchange between systems.
JSON Syntax Rules
- Keys must be strings in double quotes
- String values must use double quotes (not single)
- No trailing commas after the last item
- No comments
- Numbers must not have leading zeros
Examples
{"name": "Alice", "age": 30, "active": true}
{"tools": ["JSON Formatter", "Base64", "UUID Generator"]}
FAQ
Is JSON the same as JavaScript?
No. JSON is a text format derived from JavaScript syntax, but it is language-agnostic. Any programming language can parse and generate JSON.
What is the difference between JSON and XML?
JSON is more compact and faster to parse. XML supports attributes, namespaces, and comments. JSON is the standard for modern web APIs; XML persists in enterprise systems and document formats.
Related Terms