createRoute

Create a route with or without a path. Routes are the building blocks of navigation in effector/router.

API

// Path route
function createRoute<T extends string>(
  config: CreateRouteConfig<T>,
): PathRoute<ParseUrlParams<T>>;

// Pathless route
function createRoute<Params extends object | void = void>(
  config?: WithBaseRouteConfig,
): PathlessRoute<Params>;

Config

Parameter	Type	Description
path	string	Optional. URL path template with parameters
parent	Route<any>	Optional. Parent route for nesting
beforeOpen	Effect[]	Deprecated post-commit preparation Effects

Returns

Returns either PathRoute<T> or PathlessRoute<T> depending on whether path is provided. Both forms expose the same lifecycle units; createVirtualRoute remains a deprecated compatibility factory.

Property	Type	Description
$params	Store<T>	Route parameters
$isOpened	Store<boolean>	Whether route (or its children) are opened
$isPending	Store<boolean>	Deprecated route preparation is running
open	EventCallable<RouteOpenedPayload<T>>	Open the route and its parents
opened	Event<RouteOpenedPayload<T>>	Fires when route opens (client or server)
openedOnServer	Event<RouteOpenedPayload<T>>	Fires when opened on server (SSR)
openedOnClient	Event<RouteOpenedPayload<T>>	Fires when opened on client
updated	Event<RouteUpdatedPayload<T>>	Fires when an open route receives new params
close	EventCallable<void>	Closes the route
closed	Event<void>	Fires when route closes
path	string	PathRoute only: The route's path template
parent	Route<any>	Optional. The parent route
beforeOpen	Effect[]	Deprecated post-commit preparation Effects

Usage

Path Routes

Routes with paths for URL-based navigation:

import { createRoute } from '@effector/router';

// Basic route
const homeRoute = createRoute({ path: '/' });
homeRoute.open();

// Route with parameters
const userRoute = createRoute({ path: '/user/:id' });
userRoute.open({ params: { id: '123' } });

// Route with query
const searchRoute = createRoute({ path: '/search' });
searchRoute.open({ query: { q: 'hello' } });

Pathless Routes

Calling createRoute() without a path creates a self-contained virtual route. It can be opened directly, does not require router registration, and never writes to history.

For routes without required params, route.open(), route.open({}), and route.open({ params: {} }) are equivalent and produce one canonical empty payload. Parameterized routes use only the params supplied by the current open; missing values are never merged from previous route state.

When a route has a parent, the child receives the intersection of parent and child params. The parent route keeps only the params declared by its own path. Duplicate names are rejected during path validation.

The first activation emits opened, not updated. Later value changes emit one updated payload; equal params, query-only changes, and closing the route do not emit it. Param comparison ignores object key order but preserves array order and the difference between null and an absent key.

The route contract is shared by path and pathless routes, including nested parent chains and Fork/SSR usage. The deprecated createVirtualRoute alias is covered by the same compatibility matrix and remains history-independent.

Routes without paths for dialogs, modals, or other non-URL navigation:

import { createRoute } from '@effector/router';

// Without parameters
const dialogRoute = createRoute();
dialogRoute.open();

// With typed parameters
const confirmDialog = createRoute<{ title: string; message: string }>();
confirmDialog.open({
  params: { title: 'Delete', message: 'Are you sure?' },
});

Register Pathless Routes

Pathless routes must be assigned a path when registered in the router:

import { createRouter } from '@effector/router';

const router = createRouter({
  routes: [
    homeRoute, // Has path: '/'
    { path: '/dialog', route: dialogRoute }, // Assign path to pathless route
  ],
});

Path Parameters

Path parameters are automatically parsed and type-checked:

import { createRoute } from '@effector/router';

// String parameters (default)
const userRoute = createRoute({ path: '/user/:id' });
//    ^- Route<{ id: string }>

userRoute.open({ params: { id: '123' } });

Typed Parameters

Specify parameter types for validation and type safety:

// Number parameters
const postRoute = createRoute({ path: '/post/:id<number>' });
//    ^- Route<{ id: number }>

postRoute.open({ params: { id: 42 } });

// Union types
const modeRoute = createRoute({ path: '/edit/:mode<create|update>' });
//    ^- Route<{ mode: 'create' | 'update' }>

modeRoute.open({ params: { mode: 'create' } });

// Multiple parameters
const blogRoute = createRoute({
  path: '/blog/:year<number>/:month<number>/:slug',
});
//    ^- Route<{ year: number; month: number; slug: string }>

blogRoute.open({
  params: { year: 2024, month: 1, slug: 'hello-world' },
});

See @effector/router-paths for all supported parameter types and modifiers.

Observe Navigation and Applied Parameters

Use opened to react after a route opens on either the client or server. At that point $params contains the parameters applied to the route:

import { sample } from 'effector';

const userRoute = createRoute({ path: '/user/:id' });

sample({
  clock: userRoute.opened,
  source: userRoute.$params,
  fn: (params, openPayload) => ({ params, openPayload }),
  target: routeOpenedFx,
});

Subscribe to $params directly when every parameter update matters, including updates while the route remains open:

userRoute.$params.watch((params) => {
  console.log('Applied user id:', params.id);
});

For platform-specific SSR handling, use openedOnServer or openedOnClient instead of the combined opened event.

Nested Routes (Parent)

Create route hierarchies where child routes inherit their parent's path and lifecycle:

import { createRoute } from '@effector/router';

const profileRoute = createRoute({ path: '/profile/:userId' });

// Child routes inherit parent path
const friendsRoute = createRoute({
  path: '/friends',
  parent: profileRoute,
});
//    Full path: /profile/:userId/friends

const postsRoute = createRoute({
  path: '/posts',
  parent: profileRoute,
});
//    Full path: /profile/:userId/posts

// Opening child opens parent
postsRoute.open({ params: { userId: '123' } });
// profileRoute.$isOpened → true
// postsRoute.$isOpened → true

Parent Lifecycle

Parent routes open automatically when children open:

import { sample } from 'effector';

const parentRoute = createRoute({ path: '/parent' });
const childRoute = createRoute({ path: '/child', parent: parentRoute });

// Track parent opening
sample({
  clock: parentRoute.opened,
  fn: () => console.log('Parent opened'),
});

// Opens both parent and child
childRoute.open();

Deprecated beforeOpen

createRoute({ beforeOpen }) is kept for compatibility. It runs exactly once after the history adapter confirms the new location. It is therefore not a transition guard: the URL has already changed when the Effect starts. If it fails, the route does not emit opened, while the Effect exposes its normal fail/failData events. A route that was already open is closed so stale params cannot remain active for the new URL.

For new code, derive readiness with chainRoute:

const readyProfileRoute = chainRoute({
  route: profileRoute,
  beforeOpen: loadUserFx,
});

Use readyProfileRoute.$isPending for model preparation. To hold history before commit, use beforeNavigate instead.

Open with Query Parameters

Omitting query preserves the current URL query when a path route opens. A provided object replaces it, and query: {} clears it. The same semantics are used by redirects and links.

const searchRoute = createRoute({ path: '/search' });

searchRoute.open({
  query: { q: 'typescript', sort: 'recent' },
});
// URL: /search?q=typescript&sort=recent

Replace History Entry

const route = createRoute({ path: '/page' });

route.open({ replace: true });
// Replaces current history entry instead of adding new one

Best Practices

Use Path Routes for URLs

Use path routes when the route should be reflected in the browser URL:

// ✅ Good: URL-based navigation
const productsRoute = createRoute({ path: '/products' });
const productRoute = createRoute({ path: '/product/:id' });

Use Pathless Routes for UI State

Use pathless routes for UI elements that don't need URLs:

// ✅ Good: UI state without URL
const confirmDialog = createRoute<{ message: string }>();
const drawer = createRoute();
const tooltip = createRoute<{ text: string }>();

Type Your Parameters

Always specify parameter types for type safety:

// ✅ Good: Typed parameters
const route = createRoute({ path: '/user/:id<number>' });

// ❌ Bad: Untyped (defaults to string)
const route = createRoute({ path: '/user/:id' });

Compose Shared Policy Outside Route Creation

Use parent for path hierarchy. Compose authorization or confirmation from a shared controls instance:

const adminRoute = createRoute({ path: '/admin' });
const usersRoute = createRoute({ path: '/users', parent: adminRoute });
const settingsRoute = createRoute({ path: '/settings', parent: adminRoute });

beforeNavigate({
  controls,
  to: [adminRoute, usersRoute, settingsRoute],
  filter: $unauthorized,
});

See Also

• createRouter - Create router with routes
• createVirtualRoute - Create virtual routes
• beforeNavigate - Hold transitions before history
• chainRoute - Derive post-commit readiness
• @effector/router-paths - Path parameter syntax