API with NestJS #30. Scalar Types in GraphQL

API with NestJS #30. Scalar types in GraphQL - With GraphQL, we model our API as a graph. Within a schema, we have various types of nodes that can relate to each other.

• 1.  API with NestJS #1. Controllers, routing and the module structure
• 2.  API with NestJS #2. Setting up a PostgreSQL database with TypeORM
• 3.  API with NestJS #3. Authenticating users with bcrypt, Passport, JWT, and cookies
• 4.  API with NestJS #4. Error handling and data validation
• 5.  API with NestJS #5. Serializing the response with interceptors
• 6.  API with NestJS #6. Looking into dependency injection and modules
• 7.  API with NestJS #7. Creating relationships with Postgres and TypeORM
• 8.  API with NestJS #8. Writing unit tests
• 9.  API with NestJS #9. Testing services and controllers with integration tests
• 10.  API with NestJS #10. Uploading public files to Amazon S3
• 11.  API with NestJS #11. Managing private files with Amazon S3
• 12.  API with NestJS #12. Introduction to Elasticsearch
• 13.  API with NestJS #13. Implementing refresh tokens using JWT
• 14.  API with NestJS #14. Improving performance of our Postgres database with indexes
• 15.  API with NestJS #15. Defining transactions with PostgreSQL and TypeORM
• 16.  API with NestJS #16. Using the array data type with PostgreSQL and TypeORM
• 17.  API with NestJS #17. Offset and keyset pagination with PostgreSQL and TypeORM
• 18.  API with NestJS #18. Exploring the idea of microservices
• 19.  API with NestJS #19. Using RabbitMQ to communicate with microservices
• 20.  API with NestJS #20. Communicating with microservices using the gRPC framework
• 21.  API with NestJS #21. An introduction to CQRS
• 22.  API with NestJS #22. Storing JSON with PostgreSQL and TypeORM
• 23.  API with NestJS #23. Implementing in-memory cache to increase the performance
• 24.  API with NestJS #24. Cache with Redis. Running the app in a Node.js cluster
• 25.  API with NestJS #25. Sending scheduled emails with cron and Nodemailer
• 26.  API with NestJS #26. Real-time chat with WebSockets
• 27.  API with NestJS #27. Introduction to GraphQL. Queries, mutations, and authentication
• 28.  API with NestJS #28. Dealing in the N + 1 problem in GraphQL
• 29.  API with NestJS #29. Real-time updates with GraphQL subscriptions
• 30. API with NestJS #30. Scalar types in GraphQL
• 31.  API with NestJS #31. Two-factor authentication

With GraphQL, we model our API as a graph. Within a schema, we have various types of nodes that can relate to each other. While the fields in our query might have sub-fields, at some point, we want to work on concrete data. We refer to the type that describes an individual value as the scalar. It does not have any sub-fields and represents a leaf in the graph. In some way, scalars are similar to  primitive values.

A leaf in a graph is a node that does not have any children

GraphQL supports a set of scalar types out of the box:

• Int: a signed 32-bit  integer
• can’t hold fractional values,
• Float: signed double-precision floating-point value,
• can hold fractional values,
• Boolean: either true or false,
• ID: represents a unique identifier, serialized in the same way as String.

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