reitit

A fast data-driven router for Clojure(Script).

• Simple data-driven route syntax
• Route conflict resolution
• First-class route data
• Bi-directional routing
• Pluggable coercion (malli, schema & clojure.spec)
• Helpers for ring, http, pedestal & frontend
• Friendly Error Messages
• Extendable
• Modular
• Fast

Presentations:

• Reitit, The Ancient Art of Data-Driven, Clojure/North 2019, video
• Faster and Friendlier Routing with Reitit 0.3.0
• Welcome Reitit 0.2.0!
• Data-Driven Ring with Reitit
• Reitit, Data-Driven Routing with Clojure(Script)

Status: stable

Full Documentation

There is #reitit in Clojurians Slack for discussion & help.

Main Modules

• reitit - all bundled
• reitit-core - the routing core
• reitit-ring - a ring router
• reitit-middleware - common middleware
• reitit-spec clojure.spec coercion
• reitit-malli malli coercion
• reitit-schema Schema coercion
• reitit-swagger Swagger2 apidocs
• reitit-swagger-ui Integrated Swagger UI
• reitit-frontend Tools for frontend routing
• reitit-http http-routing with Interceptors
• reitit-interceptors - common interceptors
• reitit-sieppari support for Sieppari
• reitit-dev - development utilities

Extra modules

• reitit-pedestal support for Pedestal

Latest version

All main modules bundled:

[metosin/reitit "0.7.0"]

Optionally, the parts can be required separately.

Malli requires Clojure 1.11.

Malli is tested with the LTS releases Java 8, 11, 17 and 21.

Quick start

(require '[reitit.core :as r])

(def router
  (r/router
    [["/api/ping" ::ping]
     ["/api/orders/:id" ::order]]))

(r/match-by-path router "/api/ping")
; #Match{:template "/api/ping"
;        :data {:name ::ping}
;        :result nil
;        :path-params {}
;        :path "/api/ping"}

(r/match-by-name router ::order {:id 2})
; #Match{:template "/api/orders/:id",
;        :data {:name ::order},
;        :result nil,
;        :path-params {:id 2},
;        :path "/api/orders/2"}

Ring example

A Ring routing app with input & output coercion using data-specs.

(require '[muuntaja.core :as m])
(require '[reitit.ring :as ring])
(require '[reitit.coercion.spec])
(require '[reitit.ring.coercion :as rrc])
(require '[reitit.ring.middleware.muuntaja :as muuntaja])
(require '[reitit.ring.middleware.parameters :as parameters])

(def app
  (ring/ring-handler
    (ring/router
      ["/api"
       ["/math" {:get {:parameters {:query {:x int?, :y int?}}
                       :responses  {200 {:body {:total int?}}}
                       :handler    (fn [{{{:keys [x y]} :query} :parameters}]
                                     {:status 200
                                      :body   {:total (+ x y)}})}}]]
      ;; router data affecting all routes
      {:data {:coercion   reitit.coercion.spec/coercion
              :muuntaja   m/instance
              :middleware [parameters/parameters-middleware
                           rrc/coerce-request-middleware
                           muuntaja/format-response-middleware
                           rrc/coerce-response-middleware]}})))

Valid request:

(app {:request-method :get
      :uri "/api/math"
      :query-params {:x "1", :y "2"}})
; {:status 200
;  :body {:total 3}}

Invalid request:

(app {:request-method :get
      :uri "/api/math"
      :query-params {:x "1", :y "a"}})
;{:status 400,
; :body {:type :reitit.coercion/request-coercion,
;        :coercion :spec,
;        :spec "(spec-tools.core/spec {:spec (clojure.spec.alpha/keys :req-un [:$spec20745/x :$spec20745/y]), :type :map, :keys #{:y :x}, :keys/req #{:y :x}})",
;        :problems [{:path [:y],
;                    :pred "clojure.core/int?",
;                    :val "a",
;                    :via [:$spec20745/y],
;                    :in [:y]}],
;        :value {:x "1", :y "a"},
;        :in [:request :query-params]}}

More examples

• reitit-ring with coercion, swagger and default middleware
• reitit-frontend, the easy way
• reitit-frontend with Keechma-style controllers
• reitit-http with Pedestal
• reitit-http with Sieppari

All examples are in https://github.com/metosin/reitit/tree/master/examples

External resources

• Simple web application using Ring/Reitit and Integrant: https://github.com/PrestanceDesign/usermanager-reitit-integrant-example
• A simple Clojure backend using Reitit to serve up a RESTful API: startrek. Technologies include:
  • Donut System
  • next-jdbc
  • JUXT Clip
  • Flyway
  • HoneySQL
  • Babashka
• https://www.learnreitit.com/
• Lipas, liikuntapalvelut: https://github.com/lipas-liikuntapaikat/lipas
• Implementation of the Todo-Backend API spec, using Clojure, Ring/Reitit and next-jdbc: https://github.com/PrestanceDesign/todo-backend-clojure-reitit
• Ping CRM, a single page app written in Clojure Ring, Reitit, Integrant and next.jdbc: https://github.com/prestancedesign/clojure-inertia-pingcrm-demo

More info

Check out the full documentation!

Join #reitit channel in Clojurians slack.

Roadmap is mostly written in issues.

Special thanks

• Existing Clojure(Script) routing libs, especially to Ataraxy, Bide, Bidi, calfpath, Compojure, Keechma and Pedestal.
• Compojure-api, Kekkonen, Ring-swagger and Yada and for ideas, coercion & stuff.
• Schema and clojure.spec for the validation part.
• httprouter for ideas and a good library to benchmark against

License

Copyright © 2017-2023 Metosin Oy

Distributed under the Eclipse Public License, the same as Clojure.