This document introduces GraphQL, highlighting its advantages over REST, including solutions to challenges such as over-fetching and under-fetching. It covers the fundamentals of GraphQL, including its schema, root types, and resolvers, and discusses its history and development. Additionally, it includes a demo using GitHub APIs and explores the application of GraphQL in a workshop centered on Pokémon.

1. Introduction to
GraphQL

2. > REST & GraphQL
> GraphQL Jargons
> Demo with GitHub APIs
> Tool Chains
> Workshop - Exploring the world of Pokemons with GraphQL
Agenda

3. Sakthivel Viswanathan
Senior Consultant, ThoughtWorks
Speakers Introduction
Muhil Varnan V
Consultant, ThoughtWorks

4. REST

6. Challenges faced when
working with REST?

7. Over-fetching & Under-fetching

9. > Rapid UI changes, when we scale and iterate our product
> No documentation, API explorability and schema
> No enforcement of specification
> New endpoints for new features
Other limitations?

10. What is GraphQL?
> Query language for the API
> Server runtime
> Specification
> Declarative data fetching

12. GraphQL History
2018
GraphQL Foundation,
Hosted by Linux Foundation
2012
Internally used by
facebook
2015
Publicly released

13. Schema
Scalar Types
Int Integer
Float Float
String String
Boolean Boolean
ID ID
Type Modifiers
String Nullable string
String! Required string
[String] List of strings
[String]! Required list of strings
[String!]! Required list of required strings
> Design or blueprint for our data.
> Schema has the type information, queries, mutations etc..
devhints.io/graphql

14. Schema
Express the data you have in the form of Schema
Query
Denote the data you require

15. > Request what we need
> Response will match what we
requested
> No Over-fetch and No Under-
fetch

16. Root Types

17. > A function implementing a GraphQL field
> Flexible - Query API, Query Database or any
other sources
Resolvers

18. REST GRAPHQL
http http/websocket/TCP
GET
POST
PUT
PATCH
DELETE
Methods
POST
Methods
Query
Mutation
Subscription
Action Types
GET

19. Checkpoint
> Limitations with REST
> What is GraphQL?
> Schema, Root Types, Resolvers

20. Demo

21. Github
Thinking in Graphs

22. What GraphQL is not?
> Specific to React
> Database technology
> Supports only Javascript

23. Caveats
> Caching
> Exposed to arbitrary requests
> Monitoring

24. Takeaways
> Schema, Root Types, Resolver
> Not a database technology

25. Pokemons
Exploring world of
With GraphQL

26. Don’t know what is pokemon?

27. Pokemon Types
Grass
Electric
Fire
water

28. Pokemon World

29. Capturing a pokemon

30. Apollo

31. https://graphql.org/code/
GraphQL Implementations