What is JSON?
technologyDefinition
JSON (JavaScript Object Notation) is a lightweight, text-based data format used to store and exchange structured data. It uses human-readable key-value pairs, arrays, and nested objects. JSON is the dominant data format for REST APIs, web applications, and configuration files. Valid JSON requires double-quoted keys and no trailing commas.
Detailed Explanation
JSON was derived from JavaScript syntax but is now language-independent — virtually every programming language has built-in JSON parsing support. A JSON object looks like: {"name": "ToolsDock", "tools": 69, "free": true}. Values can be strings, numbers, booleans, arrays, objects, or null.
JSON replaced XML as the dominant API data format because it is more compact, easier to read, and faster to parse. A REST API returning user data in JSON might look like: {"id": 1, "name": "Azam", "email": "contact@toolsdock.in"}.
Common JSON errors: trailing commas (allowed in JavaScript but invalid in strict JSON), single-quoted strings (must use double quotes), unquoted keys, and undefined values. Use ToolsDock's JSON Formatter to validate and format any JSON string instantly.
{ } JSON Formatter & Validator
Format & validate JSON data