Go GraphQL API

Introduction to gqlgen

gqlgen is a Go library that allows developers to build a robust and type-safe GraphQL API. It simplifies the process of defining your GraphQL schema and generating Go code, ensuring type safety and better performance.

Setting Up a Go Project with gqlgen

To begin with gqlgen, you need to have Go installed on your system. Start by creating a new Go module and install gqlgen:

Creating a GraphQL Schema

The first step in using gqlgen is to define your GraphQL schema. This is typically done in a schema.graphql file. Below is an example of a simple schema defining a Query type:

Generating Go Code from Schema

Once your schema is defined, use gqlgen to generate the Go code. This step will create the necessary types and resolvers based on your schema.

Implementing Resolvers

Resolvers are the functions responsible for fetching the data for each field in your GraphQL schema. Implement the resolver for the hello query in the generated resolver.go file:

Running Your GraphQL Server

After implementing the resolvers, you can run your GraphQL server. Start the server and test your API using a GraphQL client or playground.

Testing Your GraphQL API

You can test your API by sending queries to the server. Here's an example query to test the hello field:

This will return:

Conclusion

With gqlgen, creating a type-safe and efficient GraphQL API in Go is straightforward. By following the above steps, you can define your schema, generate code, implement resolvers, and run your server with ease.