Free Course — No signup required

Learn GraphQL
in 5 Days

GraphQL replaces REST for complex APIs. Clients ask for exactly what they need — no over-fetching, no under-fetching. Learn schema, queries, mutations, resolvers, and Apollo.

5 lessons
Self-paced
~60 min/day
Free forever
Start Day 1 — Free → See what's covered
What you'll learn

GraphQL in 5 Days

GraphQL replaces REST for complex APIs. Clients ask for exactly what they need — no over-fetching, no under-fetching. Learn schema, queries, mutations, resolvers, and Apollo.

  • Define a GraphQL schema with types and fields
  • Write queries and mutations from a client
  • Build resolvers that connect your schema to real data
  • Add authentication to a GraphQL API
  • Use Apollo Client to fetch data in React or Vue
5
practical lessons
1
endpoint for everything
$0
cost to take this course
Zero
over-fetching
5-Day Curriculum

Every lesson ships working code.
No theory without practice.

01
Schema, Types, and Your First Query
Set up Apollo Server, define types and queries in SDL, write your first resolvers, and explore the API in GraphiQL.
SDLtypesQueryresolvers
→
02
Queries: Fetching Exactly What You Need
Write queries with arguments, aliases, and fragments. Understand how GraphQL eliminates over-fetching.
argumentsaliasesfragmentsvariables
→
03
Mutations: Writing Data
Define mutations in your schema, write mutation resolvers with database interaction, and handle input validation.
Mutationinput typesresolversvalidation
→
04
Authentication and Context
Pass auth tokens via headers, validate them in the context function, and restrict resolver access by role.
contextJWTauthorizationroles
→
05
Apollo Client
Connect a React or Vue app to your GraphQL API using Apollo Client. Queries, mutations, caching, and loading states.
Apollo ClientuseQueryuseMutationcache
→
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Your instructor
B
Bo Peng
Founder, Precision AI Academy

Kaggle Top 200 data scientist. Trained 400+ professionals across universities and federal agencies. Built production systems used by thousands. This course skips toy examples and gives you patterns that work in real projects.

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