GraphQL is a query language for APIs and a runtime for fulfilling queries with existing data. Learn how to use NestJS to harness the power of GraphQL APIs.

NestJS is a TypeScript Node.js framework that helps you build enterprise-grade, efficient, and scalable Node.js applications. It supports both RESTful and GraphQL API design methodologies.

In a previous post, we covered how to build RESTful APIs using NestJS. In this tutorial, we’ll demonstrate how to use NestJS to harness the power of GraphQL APIs.

GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. It provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and facilitates the use of powerful developer tools.

Nest offers two methods of building GraphQL APIs: code-first and schema-first. The code-first approach involves using TypeScript classes and decorators to generate GraphQL schemas. With this approach, you can reuse your data model class as a schema and decorate it with the @ObjectType() decorator and Nest will autogenerate the schema from your model. The schema-first approach involves defining the schema using GraphQL’s Schema Definition Language(SDL) and then implementing a service by matching the definitions in the schema.

#graphql #javascript #nestjs #typescript #api