This presentation takes you through the basics of GraphQL and the differences between the approaches of building an API in REST and GraphQL.

1. by Pawan Kumar
Software Engineer at SquareBoat
REST vs GraphQL

2. The REST Way

3. Topic Page
Topic
Tutorial
Tutorial
Tutorial
Tutorial
Tutorial

4. REST-ful API
GET - /topics/php
GET - /topics/php/tutorials
GET - /topics/php/related_tutorials
or
GET - /topics/php?include=tutorials,related_tutorials
GET - /topics/php?include=tutorials(name,description,vote_count)
or

5. REST-ful API Issues
● Response is Implicit
● Too many Round trips
● No way to get limited fields
● No way to manipulate nested resources

6. GraphQL Way

7. What is GraphQL ?
● Query Language
● Spec
What GraphQL is not?
● A Database
● Library
● Language Specific

8. The Query
What you asked is what you get

9. GRAPHIQL

10. Type System

11. GraphQL Types

12. Resolvers

13. Resolvers

14. Mutations

15. Mutations
creating a user

16. Mutations
updating a user

17. Validations

18. Validations

19. Formatting errors

20. N+1 Problem

21. Dataloader
https://github.com/facebook/dataloader

22. GraphQL Tools
https://github.com/apollographql/graphql-tools

23. Thank you