17 unstable releases (6 breaking)

0.11.1 Dec 19, 2018
0.10.0 Sep 13, 2018
0.9.2 Jan 13, 2018
0.9.1 Dec 3, 2017
0.5.2 Nov 13, 2016

#16 in Web programming

Download history 746/week @ 2018-11-14 644/week @ 2018-11-21 790/week @ 2018-11-28 872/week @ 2018-12-05 794/week @ 2018-12-12 424/week @ 2018-12-19 251/week @ 2018-12-26 349/week @ 2019-01-02 341/week @ 2019-01-09 466/week @ 2019-01-16 471/week @ 2019-01-23 578/week @ 2019-01-30 558/week @ 2019-02-06 884/week @ 2019-02-13 519/week @ 2019-02-20

2,768 downloads per month
Used in 12 crates


28K SLoC



GraphQL is a data query language developed by Facebook 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 possible as Rust will allow.

Juniper does not include a web server - instead it provides building blocks to make integration with existing servers straightforward. It optionally provides a pre-built integration for the Iron and Rocket frameworks, including embedded Graphiql for easy debugging.

Getting Started

The best place to get started is the 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 Reference is the best place to look.

You can also check out src/tests/schema.rs to see a complex schema including polymorphism with traits and interfaces. For an example of web framework integration, see the rocket and iron examples folders.


Juniper supports the full GraphQL query language according to the 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>>>.


Data types

Juniper has automatic integration with some very common Rust crates to make building schemas a breeze. The types from these crates will be usable in your Schemas automatically.

Web Frameworks

API Stability

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


~102K SLoC