Question 1

REST vs GraphQL, which should I choose?

Accepted Answer

REST: simpler, stateless, caches well, multiple requests for relations. GraphQL: one request, flexible queries, over-fetching eliminated, complex to implement. For 90% of APIs: REST. For complex data graphs (mobile apps, dashboards): GraphQL. Most teams use both (REST for public APIs, GraphQL for internal/mobile).

Question 2

What do HTTP status codes really mean?

Accepted Answer

2xx = success (200 OK, 201 Created, 204 No Content). 3xx = redirect. 4xx = client error (400 Bad Request, 401 Unauthorized, 403 Forbidden, 404 Not Found). 5xx = server error (500 Internal, 503 Service Unavailable). Never return 200 for errors, status codes are your error handling.

Question 3

How do I paginate large datasets?

Accepted Answer

Offset/limit: ?page=2&limit=20 (simple, breaks with deletes). Cursor-based: ?cursor=abc123&limit=20 (stable, scales). Keyset: ?after_id=123&limit=20 (fastest for huge tables). Return pagination metadata: {data: [], pagination: {page, limit, total, pages}}.

Question 4

How do I version my API?

Accepted Answer

URL versioning (/v1/users, /v2/users) is most common. Header versioning (Accept: application/vnd.api.v2+json) is cleaner but harder to test in browsers. Never break without versioning, deprecate old versions 6-12 months before removal. Parallel versions = customers migrate at their own pace.

Question 5

What's the difference between PUT and PATCH?

Accepted Answer

PUT: full replacement (idempotent, same request = same result). PATCH: partial update (may not be idempotent). Most APIs use PATCH for convenience, but PUT is cleaner semantically. Both should be idempotent for retries.

Question 6

Do I need hypermedia (HATEOAS) in my API?

Accepted Answer

HATEOAS (links in responses) is REST-pure but adds complexity. For public APIs: optional (most skip it). For internal APIs: document relations in docs instead. If client needs to discover endpoints: include links in response. If client knows endpoints: skip hypermedia.

Question 7

What are REST API naming conventions?

Accepted Answer

Use nouns, not verbs (/users not /getUsers). Plural resources (/users, /products). Nested for relations (/users/123/posts). Hyphens for multi-word routes (/user-preferences). Query params for filters (/users?status=active). Use HTTP verbs for actions, not URLs.

प्रदेश	ज्युनियर	मध्यम	सीनियर
USA	$95k	$135k	$185k
UK	£55k	£80k	£115k
EU	€60k	€85k	€125k
CANADA	C$100k	C$145k	C$195k

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