Juniper (GraphQL server library for Rust)

• Juniper Book (current | edge)
• Changelog

GraphQL is a data query language developed by Facebook and intended to serve mobile and web application frontends.

Juniper makes it possible to write GraphQL servers in Rust that are type-safe and blazingly fast. We also try to make declaring and resolving GraphQL schemas as convenient as Rust will allow.

Juniper doesn't include a web server - instead it provides building blocks to make integration with existing servers straightforward, including embedded GraphiQL and/or GraphQL Playground for easy debugging.

Getting Started

The best place to get started is Juniper Book, which contains guides with plenty of examples, covering all features of Juniper.

To get started quickly and get a feel for Juniper, check out the "Quickstart" section.

For specific information about macros, types and the Juniper API, the API docs is the best place to look.

Features

Juniper supports the full GraphQL query language according to October 2021 GraphQL specification, including interfaces, unions, schema introspection, and validations. It does not, however, support the schema language.

As an exception to other GraphQL libraries for other languages, Juniper builds non-null types by default. A field of type Vec<Episode> will be converted into [Episode!]!. The corresponding Rust type for e.g. [Episode] would be Option<Vec<Option<Episode>>>.

Integrations

Types

Juniper provides out-of-the-box integration for some very common Rust crates to make building schemas a breeze. The types from these crates will be usable in your schemas automatically after enabling the correspondent self-titled Cargo feature:

• bigdecimal
• bson
• chrono, chrono-tz
• rust_decimal
• time
• url
• uuid

Web server frameworks

• actix-web (juniper_actix crate)
• axum (juniper_axum crate)
• hyper (juniper_hyper crate)
• rocket (juniper_rocket crate)
• warp (juniper_warp crate)

API stability

Juniper has not reached 1.0 yet, thus some API instability should be expected.

License

This project is licensed under BSD 2-Clause License.