Level 0 (SWAMP OF POX) — EK SINGLE URI, EK HI HTTP METHOD (TYPICALLY POST) SE, SAARE OPERATIONS HANDLE hote hain — SOAP jaisा, RPC-STYLE. Level 1 (RESOURCES) — MULTIPLE URIs (HAR RESOURCE ka APNA URI), LEKIN SAB, SAME HTTP METHOD USE karте hain.

Level 2 (HTTP VERBS) — DIFFERENT RESOURCES, DIFFERENT URIs, aur SAHI HTTP METHODS (GET, POST, PUT, DELETE) USE hote hain, PROPER STATUS CODES ke SAATH — MOST REAL-WORLD APIs, ISI LEVEL PAR HAIN. Level 3 (HYPERMEDIA/HATEOAS) — RESPONSE mein, "AGLE POSSIBLE ACTIONS" ke LINKS, INCLUDED hote hain — TRUE REST, ISI LEVEL PAR hai.

// Level 1 — resources, LEKIN, GALAT verb usage:
// POST /users/getUser/42

// Level 2 — MOST COMMON, real-world APIs:
// GET /users/42 → 200 OK
// DELETE /users/42 → 204 No Content

// Level 3 — HATEOAS ke SAATH:
// GET /orders/42 → {
//   "id": 42, "status": "PENDING",
//   "_links": {
//     "cancel": { "href": "/orders/42/cancel" },
//     "pay": { "href": "/orders/42/pay" }
//   }
// }