Router <Context>

Simple router that works based on request labels. This instance can then serve as a requestHandler of your crawler.

import { Router, CheerioCrawler, CheerioCrawlingContext } from 'crawlee';

const router = Router.create<CheerioCrawlingContext>();

// we can also use factory methods for specific crawling contexts, the above equals to:
// import { createCheerioRouter } from 'crawlee';
// const router = createCheerioRouter();

router.addHandler('label-a', async (ctx) => {
   ctx.log.info('...');
});
router.addDefaultHandler(async (ctx) => {
   ctx.log.info('...');
});

const crawler = new CheerioCrawler({
    requestHandler: router,
});
await crawler.run();

Alternatively we can use the default router instance from crawler object:

import { CheerioCrawler } from 'crawlee';

const crawler = new CheerioCrawler();

crawler.router.addHandler('label-a', async (ctx) => {
   ctx.log.info('...');
});
crawler.router.addDefaultHandler(async (ctx) => {
   ctx.log.info('...');
});

await crawler.run();

For convenience, we can also define the routes right when creating the router:

import { CheerioCrawler, createCheerioRouter } from 'crawlee';
const crawler = new CheerioCrawler({
    requestHandler: createCheerioRouter({
        'label-a': async (ctx) => { ... },
        'label-b': async (ctx) => { ... },
    })},
});
await crawler.run();

Middlewares are also supported via the router.use method. There can be multiple middlewares for a single router, they will be executed sequentially in the same order as they were registered.

crawler.router.use(async (ctx) => {
   ctx.log.info('...');
});

Hierarchy

• Router
  • RouterHandler

Index

Methods

• addDefaultHandler
• addHandler
• getHandler
• use
• create

Methods

addDefaultHandler

• addDefaultHandler<UserData>(handler: (ctx: Omit<Context, request> & { request: Request<UserData> }) => Awaitable<void>): void

• Registers default route handler.

  ---

  Type parameters

  • UserData: Dictionary = GetUserDataFromRequest<Context[request]>

  Parameters

  • handler: (ctx: Omit<Context, request> & { request: Request<UserData> }) => Awaitable<void>

  Returns void

addHandler

• addHandler<UserData>(label: string | symbol, handler: (ctx: Omit<Context, request> & { request: Request<UserData> }) => Awaitable<void>): void

• Registers new route handler for given label.

  ---

  Type parameters

  • UserData: Dictionary = GetUserDataFromRequest<Context[request]>

  Parameters

  • label: string | symbol

  • handler: (ctx: Omit<Context, request> & { request: Request<UserData> }) => Awaitable<void>

  Returns void

getHandler

• getHandler(label?: string | symbol): (ctx: Context) => Awaitable<void>

• Returns route handler for given label. If no label is provided, the default request handler will be returned.

  ---

  Parameters

  • optionallabel: string | symbol

  Returns (ctx: Context) => Awaitable<void>

  • • (ctx: Context): Awaitable<void>

    • Returns route handler for given label. If no label is provided, the default request handler will be returned.

      ---

      Parameters

      • ctx: Context

      Returns Awaitable<void>

use

• use(middleware: (ctx: Context) => Awaitable<void>): void

• Registers a middleware that will be fired before the matching route handler. Multiple middlewares can be registered, they will be fired in the same order.

  ---

  Parameters

  • middleware: (ctx: Context) => Awaitable<void>

  Returns void

staticcreate

• create<Context, UserData>(routes?: RouterRoutes<Context, UserData>): RouterHandler<Context>

• Creates new router instance. This instance can then serve as a requestHandler of your crawler.

  import { Router, CheerioCrawler, CheerioCrawlingContext } from 'crawlee';
  
  const router = Router.create<CheerioCrawlingContext>();
  router.addHandler('label-a', async (ctx) => {
     ctx.log.info('...');
  });
  router.addDefaultHandler(async (ctx) => {
     ctx.log.info('...');
  });
  
  const crawler = new CheerioCrawler({
      requestHandler: router,
  });
  await crawler.run();

  ---

  Type parameters

  • Context: CrawlingContext<unknown, Dictionary> = CrawlingContext<unknown, Dictionary>
  • UserData: Dictionary = GetUserDataFromRequest<Context[request]>

  Parameters

  • optionalroutes: RouterRoutes<Context, UserData>

  Returns RouterHandler<Context>