Building GraphQL APIs in C# GraphQL is an exciting new API architecture that enables huge performance benefits over REST APIs. But what is GraphQL? Why is it better than REST? And how do you create a GraphQL API in C#. Join me as we learn all of this and more! - Introduction to GraphQL - Difference between REST & GraphQL - C# libraries for building GraphQL APIs - How to create a GraphQL API in C# using Hot Chocolate - How AWS App Sync makes it easy to publish to the cloud

1. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
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3. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/

4. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
https://facebook.com/user/id
https://facebook.com/user/id/events
https://facebook.com/user/id/friends-suggestions
https://facebook.com/user/id/friends-birthdays
…

5. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/

6. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
GraphQL API Requests
query {
user(id:18794326) {
name
events {
count
}
friends_suggestions(first: 1) {
name
mutual_friends {
count
}
}
}
}
{
"data": {
"user": {
"name": "Brandon Minnick",
"events": {
"count": 4
},
"friends_suggestions": [{
"name": "Seth Juarez",
"mutual_friends": {
"count": 18
}
}
]
}
}
}
Query Response

7. GitHub
GraphQL API

9. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
GraphQL APIs Have One Endpoint
Each GraphQL Request Uses The Same API Endpoint

10. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
GraphQL APIs Are Self Documenting
Users can explore GraphQL APIs using GraphiQL

11. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
GraphQL Requests Are POST Requests
GraphQL requests leverage the HTTP POST Method

12. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
{ “query” : “[Your GraphQL Query]” }
GraphQL Request Body is JSON
JSON contains one field: query

13. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
GraphQL Response is JSON
Like REST APIs, GraphQL APIs return JSON

14. Let’s Write
Some Code

15. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/

16. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
 GraphQL-DotNet
 Open Source (150+ Contributors)
 16.5M NuGet Downloads

17. AWS
AppSync

18. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
Resources
https://codetraveler.io/dotnet-graphql-orlando/

19. @TheCodeTraveler https://codetraveler.io/dotnet-graphql-orlando/
Thank You
https://codetraveler.io/dotnet-graphql-orlando/