{"id":17109957,"url":"https://github.com/oe/composie","last_synced_at":"2026-01-20T22:36:30.524Z","repository":{"id":36259797,"uuid":"150833608","full_name":"oe/composie","owner":"oe","description":"compose middleware with router and run it like a 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reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["compose","koa","middleware"],"created_at":"2024-10-14T16:24:57.020Z","updated_at":"2026-01-20T22:36:30.509Z","avatar_url":"https://github.com/oe.png","language":"TypeScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"\u003ch1 align=\"center\"\u003eComposie\u003c/h1\u003e\n\n\u003cdiv align=\"center\"\u003e\n  \u003ca href=\"https://github.com/oe/composie/actions/workflows/pages.yml\"\u003e\n    \u003cimg src=\"https://github.com/oe/composie/actions/workflows/pages.yml/badge.svg\" alt=\"Github Workflow\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"#readme\"\u003e\n    \u003cimg src=\"https://badges.frapsoft.com/typescript/code/typescript.svg?v=101\" alt=\"code with typescript\" height=\"20\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"#readme\"\u003e\n    \u003cimg src=\"https://badge.fury.io/js/composie.svg\" alt=\"npm version\" height=\"20\"\u003e\n  \u003c/a\u003e\n  \u003ca href=\"https://www.npmjs.com/package/composie\"\u003e\n    \u003cimg src=\"https://img.shields.io/npm/dm/composie.svg\" alt=\"npm version\" height=\"20\"\u003e\n  \u003c/a\u003e\n\u003c/div\u003e\n\n\u003cbr\u003e\nComposie is a library similar to Koa and Koa-Router that allows you to compose middleware and run them with ease. In addition to being a middleware and routing solution, Composie can also serve as an advanced event bus with `on`, `off`, and `emit` methods.\n\n## Features\n\n- **Middleware Composition**: Supports chaining and complex middleware compositions.\n- **Routing**: Based on path routing for middleware.\n- **Event Bus**: Easily handle and trigger events using `on`, `off`, and `emit`.\n\n\n## Installation\nInstall via npm:\n\n```sh\nnpm install composie\n```\n\nOr via yarn:\n\n```sh\nyarn add composie\n```\n\n## Usage\n\n### Basic Usage\n```js\nimport Composie from 'composie'; // or const Composie = require('composie');\nconst composie = new Composie();\n// Add global middleware\ncomposie.use((ctx, next) =\u003e {\n  console.log('Global middleware');\n  return next();\n});\n\n// Add route middleware\ncomposie.route('api/user-info', (ctx, next) =\u003e {\n  ctx.response = 'User info';\n  return next();\n});\n\n// Run middleware\ncomposie.run('api/user-info').then(response =\u003e {\n  console.log(response); // 'User info'\n});\n\n// remove route\ncomposie.remove('api/user-info');\n```\n\n### Using as an Event Bus\n```js\nconst Composie = require('composie');\nconst composie = new Composie();\n\n// add general middleware for all events\ncomposie.use(async (ctx, next) =\u003e {\n  // simulate async operation\n  await Promise(resolve =\u003e setTimeout(resolve, 1000));\n  console.log(`Handling event: ${ctx.channel}`);\n  return next();\n});\n\n// Listen for events\ncomposie.on('user-registered', (ctx, next) =\u003e {\n  console.log(`Handling event for user: ${ctx.request.user}`);\n  // to continue to the next callback\n  return next();\n});\n// chain another callback\ncomposie.on('user-registered', (ctx, next) =\u003e {\n  if (ctx.request.user === 'Alice') {\n    ctx.response = 'Alice is registered';\n  } else {\n    // to continue to the next callback\n    return next()\n  }\n});\n// even chain more callbacks\ncomposie.on('user-registered', (ctx, next) =\u003e {\n  ctx.response = `User ${ctx.request.user} is not registered`;\n});\n\n// Emit events\ncomposie.emit('user-registered', { user: 'Alice' }).then((response) =\u003e {\n  console.log(response); // 'Alice is registered'\n});\n\ncomposie.emit('user-registered', { user: 'Bob' }).then((response) =\u003e {\n  console.log(response); // 'User Bob is not registered'\n});\n\n// Remove event listener\ncomposie.off('user-registered');\n```\n\n## API Documentation\n\nBefore you get started, there are some basic concepts of this library.\n\n1. Every middleware(callback) is a function that receive two parameters `ctx` and `next`:\n\n```js\nfunction (ctx, next) {\n  // your logic here\n}\n```\n\n2. `ctx` is an object contains request info:\n\n```js\n{\n  // channel name, required\n  channel: 'channel name',\n  // data you passed by run or emit, optional\n  request: 'any request data'\n  // response data, you should save your result in it\n  response: 'any response data'\n  // you can add your own property to ctx to share information between middlewares\n  ...\n}\n```\n\n   1. You should save your result in `ctx.response`, you will get it in `.run`(or `.emit`) promise resolve\n   2. and you can add your own property to `ctx` to share information between middlewares\n   3. **use `return next()` or `await next()`(in async function) if you want `ctx` be processed by the next middleware, or just `return` to terminate it**\n   4. use `throw` to throw an error if an error occurred, you will catch it in `.run`(or `.emit`) promise reject\n\n### Composie\n\nCreate an instance\n\n```js\nimport Composie from 'composie'\n// no arguments is needed\nconst composie = new Composie()\n\n```\n\nThis libaray is writen in `class`, you should create an instance with `new` before use it\n\n### composie.use(middleware)\n\nAdd global middleware, all invoking will proccessed by global middleware\n\n```js\n// basic usage\ncomposie.use(function(ctx, next) {\n  // your logic here\n  return next();\n});\n\n// advanced usage\ncomposie.use(async function(ctx, next) {\n  try {\n    // your logic here\n    await next();\n  } catch (err) {\n    // handle error, you can throw it again or just log it\n    console.error(err);\n    // set a default response, if you want\n    ctx.response = '404 Not Found';\n    // or just throw it again, then you can catch it in `.run`(or `.emit`) promise reject\n    // throw err;\n  }\n})\n// chain more than one middleware\n.use(function(ctx, next) {\n  // your logic here\n  return next();\n});\n```\n\nYou can add more than more than one global `middleware`, they will run by the order you adding.\n\n### composie.use(channelPrefix, middleware)\n\nAdd a middleware for channel has specific prefix, when run the middleware, if the channel match the prefix, then will be processed by the that middleware.\n\n```js\ncomposie.use('api', function(ctx, next) {\n  // your logic here\n  return next()\n});\n```\nYou can also add as many middlewares as you want for one prefix, they will be called in the order they added.\n\n### composie.route(channel, middleware, [middleware...])\n\nAdd middlewares for a specific channel, you can add more than one at a time.\n\n`composie.on` is an alias of `composie.route`, use it as you like.\n\n```js\ncompose.route(\n  \"api/user\",\n  function(ctx, next) {\n    // your logic here\n  },\n  function(ctx, next) {\n    // another middleware\n  }\n);\n```\n\n### composie.route({channel: [middleware...]})\n\nAdd middlewares for more than one channel\n\n`composie.on` is an alias of `composie.route`, use it as you like.\n\n```js\ncompose.route({\n  \"api/user\": function(ctx, next) {\n    // your logic here\n  },\n  \"api/detail\": [\n    function(ctx, next) {\n      // your logic here\n    },\n    function(ctx, next) {\n      // another middleware\n    }\n  ]\n});\n```\n\n### chain `use`, `route` together\n\nYou can chain `use` and `route` together\n\n```js\ncompose\n  .use(function(ctx, next) {\n    // your logic here\n    // ...\n    return next();\n  })\n  .use('api', function(ctx, nexdt) {\n    // your logic here\n    // ...\n    return next();\n  })\n  .route('api/user', function(ctx, next) {\n    // your logic here\n  })\n  // `on` is an alias of `route`\n  .on('api/detail', function(ctx, next) {\n    // your logic here\n  });\n\n```\n\n### composie.alias(existingChannel, aliasName)\nadd an alias for an existing channel, when you run the alias, it will be processed by the middleware of the existing channel.\n\n```js\ncomposie.route('api/user', function(ctx, next) {\n  ctx.response = 'User info';\n});\ncomposie.alias('api/user', 'user');\n\ncomposie.run('user').then(response =\u003e {\n  console.log(response); // 'User info'\n});\n```\n\n\n\n### composie.removeRoute(channel, middleware?)\nRemove a middleware for a specific channel, if `middleware` is not provided, then all middlewares for that channel will be removed.\n\n`composie.off` is an alias of `composie.removeRoute`, use it as you like.\n\n```js\ncomposie.removeRoute('api/user');\n\ncompose.off('api/user', middleware);\n```\n\nWhen you remove a alias, the alias will be removed, but the existing channel will be kept.\n\n\n### composie.run(channel, request?)\n\nrun middleware for `channel`, it will return a promise\n\n`composie.emit` and `composie.call` are aliases of `composie.run`, use it as you like.\n\n```js\ncompose.run(\"api/user\", { id: \"xxx\" }).then(\n  resp =\u003e {\n    console.log(\"response \", resp);\n  },\n  err =\u003e {\n    console.log(\"error\", err);\n  }\n);\n```\n### createEventBus(options)\nUtilize Composie as an Event Bus for efficient event handling in your applications.\n\n```ts\nimport { createEventBus } from 'composie';\n\nconst eventBus = createEventBus(...)\n\ninterface IEventBusOptions\u003cIContext extends IBaseContext\u003e {\n  /**\n   * convert a normal callback to a route handler\n   */\n  convertCallback2Middleware?: (fn: Function) =\u003e ((ctx: IContext, next: Function): any)\n  /**\n   * create context function\n   */\n  createContext?: (channel: string, request: any) =\u003e IContext\n  /**\n   * throw when no route found\n   */\n  throwWhenNoRoute?: boolean\n}\n```\n\nfor detail usage check the example below\n\n\n## Use Composite as a Event Bus\n\n```ts\nimport { createEventBus } from 'composie';\nconst eventBus = createEventBus({\n  // this is default the default converter\n  convertCallback2Middleware: (fn) =\u003e {\n    return async (ctx, next) =\u003e {\n      try {\n        const response = await fn(ctx.request);\n        if (typeof response !== 'undefined') {\n          ctx.response = response\n        }\n        return next();\n      } catch (err) {\n        throw err;\n      }\n    }\n  }\n});\n\neventBus.use(...)\neventBus.on('userChanged', (userInfo) =\u003e {\n  console.log(userInfo)\n})\neventBus.emit('userChanged', { name: 'xxx', email: 'xxxx'})\n```\n\n\n\n## Advanced Example\n\nFollowing example shows how to use Composie as an advanced fetch module for a real world application.\n\n```js\n\nimport Composie, { ComposieError } from 'composie';\nconst grab = new Composie({\n  createContext: (channel, request) =\u003e ({\n    // lower case the channel name\n    channel: channel.toLowerCase(),\n    request,\n  },\n  throwWhenNoRoute: true\n));\n\ngrab.use(async (ctx, next) =\u003e {\n  try {\n    // append query string to the url\n    if (ctx.request.qs) {\n      const qs = new URLSearchParams(ctx.request.qs);\n      const url = new URL(ctx.request.url);\n      // append query string to the url, concat with the existing query string\n      url.search = new URLSearchParams([...url.searchParams, ...qs]);\n      ctx.request.url = url.toString();\n    }\n\n    await next();\n  } catch (err) {\n    if (err instanceof ComposieError) {\n      if (err.code === ComposieError.CODES.ROUTE_NOT_FOUND) {\n        console.error('Route not found');\n      } else if (err.code === '') {\n        console.error('Method not allowed');\n      }\n      console.error(err.message);\n    } else {\n      if (err.code === '401') {\n        location.path = '/login';\n      }\n    }\n  }\n});\ngrab.use('post/', (ctx, next) =\u003e {\n  ctx.request.method = ctx.request.method || 'POST';\n  return next();\n});\n\ngrab.on('post/json', (ctx, next) =\u003e {\n  if (ctx.request.data) {\n   ctx.request.headers = {\n     ...ctx.request.headers,\n     'Content-Type': 'application/json'\n   };\n   ctx.request.body = JSON.stringify(ctx.request.data);\n  }\n  ctx.response = await fetch(ctx.request).then(res =\u003e res.json());\n});\n\ngrab.on('post/form', async (ctx, next) =\u003e {\n  if (ctx.request.data) {\n    ctx.request.headers = {\n      ...ctx.request.headers,\n      'Content-Type': 'application/x-www-form-urlencoded'\n    };\n    ctx.request.body = new URLSearchParams(ctx.request.data);\n  }\n  ctx.response = await fetch(ctx.request).then(res =\u003e res.json());\n})\n\n\ngrab.use('get/', (ctx, next) =\u003e {\n  ctx.request.method = ctx.request.method || 'GET';\n  return next();\n});\n\n\ngrab.on('post/json', async (ctx, next) =\u003e {\n  ctx.response = await fetch(ctx.request).then(res =\u003e res.json());\n  return next();\n});\n\n\ngrab.emit('post/json', {\n  url: 'https://jsonplaceholder.typicode.com/users/1'\n}).then((response) =\u003e {\n  console.log(response);\n});\n\n```\n\n\n## Contribution Guide\nWe welcome contributions! Please read the following guide to understand how to contribute to the project.\n\n## Submitting Issues\nIf you find a bug or have a feature request, please submit an issue detailing the problem or suggestion.\n\n## Submitting Pull Requests\n1. Fork the repository\n2. Create a new branch (`git checkout -b feature-branch`)\n3. Commit your changes (`git commit -am 'message'`)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Foe%2Fcomposie","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Foe%2Fcomposie","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Foe%2Fcomposie/lists"}