Developer
8 min read
March 20, 2025

JSON Explained: A Beginner's Guide to Understanding JSON Data

JSON is the language the internet uses to pass data between apps. Six data types, two rules — then everything clicks.

JSON Explained: A Beginner's Guide to Understanding JSON Data

String, Number, Boolean, Null, Object, Array — exactly six, nothing else.

Common Mistakes That Break JSON

Trailing commas — valid JavaScript, invalid JSON:

{"name": "Ahmed", "age": 28,} — INVALID

Single quotes — JSON requires double quotes:

{'name': 'Ahmed'} — INVALID

Comments — JSON has no comment syntax whatsoever.

Real API Response Example

{

"city": "Karachi",

"temperature": { "current": 34, "unit": "celsius" },

"humidity": 72,

"timestamp": "2025-06-03T14:30:00Z"

}

JSON vs XML vs YAML

FeatureJSONXMLYAML
File sizeSmallLargeSmall
CommentsNoYesYes
Best forAPIs, dataDocumentsConfig files

Validate and format JSON with our JSON Formatter — shows exact error line numbers.

Written by the GMC Tools team

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