graphql-rust/juniper

★ 5,956RustAudience · developerComplexity · 3/5Setup · moderate

Mindmap

mindmap
  root((juniper))
    What it does
      GraphQL API server
      Code-first schema
      Rust types to schema
    Features
      Full GraphQL spec
      Async resolver support
      Graphiql browser UI
      Schema export
    Integrations
      Actix and Axum
      Rocket and Warp
      Hyper
    Use cases
      Rust backend APIs
      Type-safe GraphQL

mindmap root((juniper)) What it does GraphQL API server Code-first schema Rust types to schema Features Full GraphQL spec Async resolver support Graphiql browser UI Schema export Integrations Actix and Axum Rocket and Warp Hyper Use cases Rust backend APIs Type-safe GraphQL

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Things people build with this

USE CASE 1

Add a GraphQL endpoint to an existing Rust web server using Actix or Axum with minimal configuration code.

USE CASE 2

Define a type-safe GraphQL schema using Rust structs and enums without writing any SDL schema files by hand.

USE CASE 3

Serve a Graphiql browser interface during development so frontend developers can explore and test the API interactively.

USE CASE 4

Write async GraphQL resolvers that fetch data from a database without blocking the server thread.

Tech stack

RustCargoGraphQLActixAxumRocketWarp

Getting it running

Difficulty · moderate Time to first run · 1h+

Pre-1.0, API changes are expected between releases, pin a specific version in Cargo.toml to avoid breaking changes on update.

In plain English

Juniper is a GraphQL server library for Rust. GraphQL is a data query language created by Facebook that lets a frontend application describe exactly what data it needs in a single request, rather than calling multiple separate API endpoints. Juniper allows Rust programs to define and serve a GraphQL API. The library uses a code-first approach: a developer defines the data schema using Rust types and annotations in their code, and Juniper generates the corresponding GraphQL schema from that. It supports the full GraphQL specification from October 2021, including interfaces, unions, schema introspection, and validation. It can also export the schema in GraphQL Schema Language format. Both synchronous and asynchronous query execution are supported, with asynchronous execution working with any async runtime. Juniper does not include a web server. Instead, it provides building blocks that plug into existing Rust web frameworks. Pre-built integrations exist for Actix, Axum, Hyper, Rocket, and Warp. These integrations include embedded Graphiql and GraphQL Playground interfaces, which let developers test and explore their API from a browser during development. The library automatically handles common Rust data types from widely-used crates, including UUID values, URLs, date and time types from chrono and jiff, and BSON. This means those types can be used directly in schema definitions without additional conversion code. Documentation includes a Juniper Book with guides and examples, a full API reference on docs.rs, and an example Star Wars schema demonstrating advanced features like polymorphism with traits. The project is available as a Rust crate but has not yet reached version 1.0, so some API changes should be expected.

Copy-paste prompts

Prompt 1

Show me a minimal Juniper GraphQL schema in Rust with a User type, a query that returns a user by ID, and a mutation that creates a new user.

Prompt 2

I have an Axum web server in Rust and want to add a /graphql endpoint using Juniper. Show me the route setup, schema initialization, and how to expose Graphiql for development.

Prompt 3

How do I write an async resolver in Juniper that queries PostgreSQL using sqlx and returns the result without blocking the async runtime?

Prompt 4

Show me how to use Juniper interfaces and union types to return either a TextPost or an ImagePost from the same GraphQL query field.

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