99designs/gqlgen

★ 10,721GoAudience · developerComplexity · 3/5Setup · moderate

Mindmap

mindmap
  root((gqlgen))
    What it does
      Generates Go server code
      From GraphQL schema
    Key features
      Type safety
      Schema first
      Lazy loading
      Concurrent resolvers
    Setup
      Init Go module
      Run init command
      Fill in logic
    Config
      YAML file
      Type mappings
      Generation rules

mindmap root((gqlgen)) What it does Generates Go server code From GraphQL schema Key features Type safety Schema first Lazy loading Concurrent resolvers Setup Init Go module Run init command Fill in logic Config YAML file Type mappings Generation rules

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Things people build with this

USE CASE 1

Define a GraphQL schema file and auto-generate the Go server code to handle queries and mutations.

USE CASE 2

Add a type-safe GraphQL API to an existing Go application without writing low-level parsing code.

USE CASE 3

Use lazy-loading resolvers to fetch related data only when clients specifically request it.

Tech stack

GoGraphQLYAML

Getting it running

Difficulty · moderate Time to first run · 30min

Requires initializing a Go module and running the gqlgen generator before writing any business logic.

In plain English

gqlgen is a Go library for building GraphQL servers. GraphQL is a way to define an API where clients specify exactly what data they need, and the server returns only that. This library is made for developers writing Go applications who want to expose a GraphQL API without writing a lot of repetitive boilerplate code. The library is schema-first, which means you start by writing a file that describes your API using GraphQL's own schema language. From that schema, gqlgen automatically generates the Go code that handles incoming queries, validates data types, and wires everything together. You then fill in the actual logic, such as fetching data from a database, without worrying about the scaffolding. Type safety is a central priority. The generated code uses concrete Go types rather than generic key-value maps, which means the Go compiler can catch mistakes at build time rather than at runtime. This is a deliberate choice to reduce a category of bugs that shows up in more loosely typed approaches. Getting started requires a few steps: initializing a Go module, adding gqlgen as a dependency, running the initialization command to generate a configuration file and initial models, and then running a server. The documentation site at gqlgen.com includes a step-by-step tutorial and real-world example projects. The library also handles more advanced patterns, such as lazy-loading related objects only when a client actually requests them, customizing how GraphQL IDs map to Go integer or string types, and tuning how many field resolvers run concurrently. Configuration lives in a YAML file that lets you adjust type mappings and generation behavior without modifying generated code by hand.

Copy-paste prompts

Prompt 1

I have a Go project and want to add a GraphQL API using gqlgen. Walk me through defining a schema and generating the server code.

Prompt 2

Show me a gqlgen schema for a blog app with posts and comments, and the Go resolver code that fetches from a database.

Prompt 3

In gqlgen, how do I map a GraphQL ID field to a Go int64 type in the config YAML?

Prompt 4

Explain how lazy-loading resolvers work in gqlgen and when I should use them.

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