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What is JSON? A Practical Definition

2026-07-283 min read

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What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data format for representing structured data as key-value pairs, arrays, and nested objects. It is the de facto format for web APIs because it maps directly onto native data structures in most programming languages and is far less verbose than XML.

Example

{
  "name": "ToolSphere",
  "tags": ["json", "developer-tools"],
  "active": true
}

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