GraphQL
Client-specified queries instead of fixed endpoints.
GraphQL is taught here in 3 lessons, running from Schema and type system through to When GraphQL beats REST, and its pitfalls. Each lesson takes one topic, shows the working code, and links onward to the next, so the course can be read straight through in order.
| Track | Back-end Development |
| Lessons | 3 |
| Level | Beginner |
| Reading time | about 39 minutes |
| Prerequisites | Helpful, but not required: Ruby |
Lessons
- Schema and type systemThe schema definition language, nullability, and why the schema is the contract your clients are generated from.
- Queries, mutations and resolversHow a document becomes a result: the resolver map, the per-request context, and the execution stages.
- When GraphQL beats REST, and its pitfallsAn honest comparison with REST, plus the N+1, caching and cost-control problems you must plan for.
More in Back-end Development
Node.js PHP Java HTTP Go Rust Spring Boot Laravel Ruby
FAQ
How long does the GraphQL course take?
It has 3 lessons, about 39 minutes of reading. Expect roughly twice that if you type out and run every example.
Do I need prior experience for GraphQL?
Not strictly. It helps to have read Ruby first, because some lessons build on it, but every lesson explains its own assumptions.
What should I read after GraphQL?
This is the last course in Back-end Development right now. Browse the other tracks from the courses index to go sideways.
Last refreshed 2026-09-18.