Using Fastify type-providers
A Fastify type-provider is a TypeScript-only package that simplifies the definition of JSON schemas by providing type annotations and generics. Using it will allow Fastify to infer type information directly from schema definitions. Type-providers enable developers to define API endpoints’ expected input and output data easily, automatically check the type correctness at compile time, and validate the data at runtime.
Fastify supports several type-providers, such as
TypeBox. In TypeScript projects, using a type-provider can help reduce the boilerplate code required for input validation and reduce the likelihood of bugs due to invalid data types. This can ultimately make your code more robust, maintainable, and scalable.
For the sake of brevity, in the following example, we will focus only on the
TypeBox type-provider. However, since which type-provider you use is based on personal preference, we encourage you to try other...