Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

JSON

A text format for data made of objects, lists, strings, numbers, true/false and null.

JavaScript Object Notation (RFC 8259) is a text format of objects, arrays, strings, numbers, booleans and null, the default interchange format for web APIs.

Loading interactive…

Examples

  • { "name": "Ana", "points": 120, "tags": ["gold"] } is an object with a string, a number and a list.

See also

serialization CSV
Read the full section →