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Generates javascript file that defines all Rails named routes as javascript helpers


Your Rails Gemfile:

gem "js-routes"



rake js:routes 

Make routes available globally in app/javascript/packs/application.js:

window.Routes = require('routes');

Individual routes can be imported using:

import {edit_post_path, new_post_path} from 'routes';

Note: that this setup requires rake js:routes to be run each time routes file is updated.

Webpacker + automatic updates

This setup can automatically update your routes without rake js:routes being called manually. It requires rails-erb-loader npm package to work.

Add erb loader to webpacker:

yarn add rails-erb-loader
rm -f app/javascript/routes.js # delete static file if any

Create webpack ERB config config/webpack/loaders/erb.js:

module.exports = {
  test: /\.js\.erb$/,
  enforce: 'pre',
  exclude: /node_modules/,
  use: [{
    loader: 'rails-erb-loader',
    options: {
      runner: (/^win/.test(process.platform) ? 'ruby ' : '') + 'bin/rails runner'

Enable erb extension in config/webpacker/environment.js:

const erb = require('./loaders/erb')
environment.loaders.append('erb', erb)

Create routes file app/javascript/routes.js.erb:

<%= JsRoutes.generate() %>

Use routes wherever you need them app/javascript/packs/application.js:

window.Routes = require('routes.js.erb');

Sprockets (Deprecated)

If you are using Sprockets you may configure js-routes in the following way.

Require JsRoutes in app/assets/javascripts/application.js or other bundle

//= require js-routes

Also in order to flush asset pipeline cache sometimes you might need to run:

rake tmp:cache:clear

This cache is not flushed on server restart in development environment.

Important: If routes.js file is not updated after some configuration change you need to run this rake task again.


You can configure JsRoutes in two main ways. Either with an initializer (e.g. config/initializers/js_routes.rb):

JsRoutes.setup do |config|
  config.option = value

Or dynamically in JavaScript, although only Formatter Options are supported (see below)

  option: value
Routes.config(); // current config

Available Options

Generator Options

Options to configure JavaScript file generator. These options are only available in Ruby context but not JavaScript.

  • exclude - Array of regexps to exclude from routes.
    • Default: []
    • The regexp applies only to the name before the _path suffix, eg: you want to match exactly settings_path, the regexp should be /^settings$/
  • include - Array of regexps to include in routes.
    • Default: []
    • The regexp applies only to the name before the _path suffix, eg: you want to match exactly settings_path, the regexp should be /^settings$/
  • namespace - global object used to access routes.
    • Supports nested namespace like MyProject.routes
    • Default: Routes
  • camel_case - Generate camel case route names.
    • Default: false
  • url_links - Generate *_url helpers (in addition to the default *_path helpers).
    • Example: true
    • Default: false
    • Note: generated URLs will first use the protocol, host, and port options specified in the route definition. Otherwise, the URL will be based on the option specified in the default_url_options config. If no default option has been set, then the URL will fallback to the current URL based on window.location.
  • compact - Remove _path suffix in path routes(*_url routes stay untouched if they were enabled)
    • Default: false
    • Sample route call when option is set to true: Routes.users() => /users
  • application - a key to specify which rails engine you want to generate routes too.
    • This option allows to only generate routes for a specific rails engine, that is mounted into routes instead of all Rails app routes
    • Default: Rails.application
  • file - a file location where generated routes are stored
    • Default: app/javascript/routes.js if setup with Webpacker, otherwise app/assets/javascripts/routes.js if setup with Sprockets.
Formatter Options

Options to configure routes formatting. These options are available both in Ruby and JavaScript context.

  • default_url_options - default parameters used when generating URLs
    • Example: {format: "json", trailing_slash: true, protocol: "https", subdomain: "api", host: "", port: 3000}
    • Default: {}
  • prefix - string that will prepend any generated URL. Usually used when app URL root includes a path component.
    • Example: /rails-app
    • Default: Rails.application.config.relative_url_root
  • serializer - a JS function that serializes a Javascript Hash object into URL paramters like {a: 1, b: 2} => "a=1&b=2".
    • Default: nil. Uses built-in serializer compatible with Rails
    • Example: jQuery.param - use jQuery's serializer algorithm. You can attach serialize function from your favorite AJAX framework.
    • Example: function (object) { ... } - use completely custom serializer of your application.
  • special_options_key - a special key that helps JsRoutes to destinguish serialized model from options hash
    • This option exists because JS doesn't provide a difference between an object and a hash
    • Default: _options

Advanced Setup

In case you need multiple route files for different parts of your application, you have to create the files manually. If your application has an admin and an application namespace for example:

# app/javascript/admin/routes.js.erb
<%= JsRoutes.generate(namespace: "AdminRoutes", include: /admin/) %>
# app/javascript/customer/routes.js.erb
<%= JsRoutes.generate(namespace: "CustomerRoutes", exclude: /admin/) %>

In order to generate the routes JS code to a string:

routes_js = JsRoutes.generate(options)

If you want to generate the routes files outside of the asset pipeline, you can use JsRoutes.generate!:

path = "app/javascript"
JsRoutes.generate!("#{path}/app_routes.js", namespace: "AppRoutes", exclude: [/^admin_/, /^api_/])
JsRoutes.generate!("#{path}/adm_routes.js", namespace: "AdmRoutes", include: /^admin_/)
JsRoutes.generate!("#{path}/api_routes.js", namespace: "ApiRoutes", include: /^api_/, default_url_options: {format: "json"})


Configuration above will create a nice javascript file with Routes object that has all the rails routes available:

Routes.users_path() // => "/users"
Routes.user_path(1) // => "/users/1"
Routes.user_path(1, {format: 'json'}) // => "/users/1.json"
Routes.user_path(1, {anchor: 'profile'}) // => "/users/1#profile"
Routes.new_user_project_path(1, {format: 'json'}) // => "/users/1/projects/new.json"
Routes.user_project_path(1,2, {q: 'hello', custom: true}) // => "/users/1/projects/2?q=hello&custom=true"
Routes.user_project_path(1,2, {hello: ['world', 'mars']}) // => "/users/1/projects/2?hello%5B%5D=world&hello%5B%5D=mars"

Using serialized object as route function arguments:

var google = {id: 1, name: "Google"};
Routes.company_path(google) // => "/companies/1"
var google = {id: 1, name: "Google", to_param: "google"};
Routes.company_path(google) // => "/companies/google"

In order to make routes helpers available globally:

jQuery.extend(window, Routes)

Get spec of routes and required params

Possible to get spec of route by function toString:

Routes.users_path.toString() // => "/users(.:format)"
Routes.user_path.toString() // => "/users/:id(.:format)"

This function allow to get the same spec for route, if you will get string representation of the route function:

'' + Routes.users_path // => "/users(.:format)", a string representation of the object
'' + Routes.user_path // => "/users/:id(.:format)"

Route function also contain inside attribute required_params required param names as array:

Routes.users_path.required_params // => []
Routes.user_path.required_params // => ['id']

Rails Compatibility

JsRoutes tries to replicate the Rails routing API as closely as possible. If you find any incompatibilities (outside of what is described below), please open an issue.

Object and Hash distinction issue

Sometimes the destinction between JS Hash and Object can not be found by JsRoutes. In this case you would need to pass a special key to help:

Routes.company_project_path({company_id: 1, id: 2}) // => Not enough parameters
Routes.company_project_path({company_id: 1, id: 2, _options: true}) // => "/companies/1/projects/2"

What about security?

JsRoutes itself does not have security holes. It makes URLs without access protection more reachable by potential attacker. In order to prevent this use :exclude option for sensitive urls like /admin_/

JsRoutes and Heroku

When using this setup on Heroku, it is impossible to use the asset pipeline. You should use the "Very Advanced Setup" schema in this case.

For example create routes.js.erb in assets folder with needed content:

<%= JsRoutes.generate(options) %>

This should just work.

Advantages over alternatives

There are some alternatives available. Most of them has only basic feature and don't reach the level of quality I accept. Advantages of this one are:

  • Rails 4,5,6 support
  • Rich options set
  • Full rails compatibility
  • Support Rails #to_param convention for seo optimized paths
  • Well tested

Version 2 TODO

  • Add routes generation .d.ts file
  • Add config option on the output format: js, ts, d.ts
  • Add prettier
  • Add eslint
  • Add development guide
  • Upgrade guide

Thanks to contributors

Have fun


FOSSA Status