$ man json

JSON

JavaScript Object Notation. A text format for storing structured data.

by Shawn Tenam

APIs return JSON. Config files use JSON. Your daily tracker logs are JSON. It's readable by humans, parseable by machines. Key-value pairs, nested objects, arrays.

{ "name": "value", "count": 5, "tags": ["tag1", "tag2"] }. JSON files end in .json. Parse them with JSON.parse() in JavaScript or json.load() in Python.