JSON4 min read

What is JSON?

A beginner-friendly overview of JSON, how it became the web standard, and how it works.

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JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format designed to be easy for humans to read and write, and easy for machines to parse and generate. Specified in RFC 8259 and ECMA-404, it is language-independent despite deriving its syntax from JavaScript.

Why JSON Became the Internet Standard

Before JSON gained widespread adoption in the mid-2000s, XML was the dominant data format for web APIs. JSON replaced XML for several reasons:

  • Simplicity: Minimal syntax without closing tags, namespaces, or schema verbosity.
  • Native Support: Built directly into JavaScript via JSON.parse() and JSON.stringify(), as well as native libraries in Python, Go, Java, Rust, and C#.
  • Smaller Payloads: Less boilerplate characters mean faster transmission over HTTP networks.

Example JSON Document

{
  "name": "Pixlint",
  "version": "1.0.0",
  "private": true,
  "features": ["formatting", "validation", "conversion"],
  "stats": {
    "speedMs": 12,
    "clientOnly": true
  }
}