GraphQL Tutorial

1. GraphQL Introduction

What GraphQL is, the over-fetching/under-fetching problems it solves, and a first query example.

2. Schema & Types

The GraphQL SDL: types, fields, scalars, non-null, input types, and a complete example schema.

3. Queries, Mutations & Resolvers

Writing queries with arguments, mutations for writes, and how resolvers fetch the actual data.

4. Advanced GraphQL

The N+1 query problem and DataLoader, Relay-style cursor pagination, and subscriptions.

5. GraphQL Security and Rate Limiting

Query depth and complexity attacks with real examples, and rate limiting by query cost instead of request count.

6. Caching Strategies

Why GraphQL breaks HTTP caching, normalized client caches, persisted queries, and field-level response caching.

7. Federation and Schema Stitching

Combining multiple GraphQL services into one graph: schema stitching vs. Apollo-style Federation.

8. GraphQL Interview Questions

Commonly asked GraphQL interview questions with clear, practical answers.