aspida

aspida

TypeScript friendly HTTP client wrapper for the browser and node.js.

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Breaking change (2020/06/16) :warning:

Since aspida >= 0.18.0 , the property data of the request and response has been changed to body.

const { body } = await client.v1.users.post({ body: { name: "taro" } })

const body = await client.v1.users.$post({ body: { name: "taro" } })

The modules affected by this change

• @aspida/axios >= 0.8.0
• @aspida/ky >= 0.6.0
• @aspida/fetch >= 0.6.0
• @aspida/node-fetch >= 0.5.0
• openapi2aspida >= 0.8.0

Features

• Path, URL query, header, body, and response can all specify the type
• FormData / URLSearchParams content can also specify the type
• HTTP client supports axios / ky / ky-universal / fetch / node-fetch

Procedure

1. Reproduce the endpoint directory structure in the "api" directory
2. Export a Type alias named "Methods"
3. Call "aspida" with npm scripts
4. API type definition file "api/$api.ts" will be generated, so import the application and make an HTTP request

Getting Started

Installation (axios ver.)

• Using npm:

  $ npm install @aspida/axios axios
  

• Using Yarn:

  $ yarn add @aspida/axios axios
  

Create "api" directory

$ mkdir api

Create an endpoint type definition file

• GET: /v1/users/?limit={number}

• POST: /v1/users

  api/v1/users/index.ts

  type User = {
    id: number
    name: string
  }
  
  export type Methods = {
    get: {
      query?: {
        limit: number
      }
  
      resBody: User[]
    }
  
    post: {
      reqBody: {
        name: string
      }
  
      resBody: User
    }
  }
  

• GET: /v1/users/${userId}

• PUT: /v1/users/${userId}

  api/v1/users/_userId@number/index.ts

  Specify the type of path variable “userId” starting with underscore with “@number”
  If not specified with @, the default path variable type is "number | string"

  type User = {
    id: number
    name: string
  }
  
  export type Methods = {
    get: {
      resBody: User
    }
  
    put: {
      reqBody: {
        name: string
      }
  
      resBody: User
    }
  }
  

Build type definition file

package.json

{
  "scripts": {
    "api:build": "aspida"
  }
}

$ npm run api:build

> api/$api.ts was built successfully.

Make HTTP request from application

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const userId = 0
  const limit = 10
  const client = api(aspida())

  await client.v1.users.post({ body: { name: "taro" } })

  const res = await client.v1.users.get({ query: { limit } })
  console.log(res)
  // req -> GET: /v1/users/?limit=10
  // res -> { status: 200, body: [{ id: 0, name: "taro" }], headers: {...} }

  const user = await client.v1.users._userId(userId).$get()
  console.log(user)
  // req -> GET: /v1/users/0
  // res -> { id: 0, name: "taro" }
})()

Read more posts by DEV Community

aspida - DEV Community

aspida official HTTP clients

• @aspida/axios
• @aspida/ky
• @aspida/fetch
• @aspida/node-fetch

Command Line Interface Options

Option	Type	Default	Description
--config -c	string	"aspida.config.js"	Specify the path to the configuration file.
--watch -w			Enable watch mode. Regenerate $api.ts according to the increase / decrease of the API endpoint file.
--version -v			Print aspida version.

Options of aspida.config.js

Option	Type	Default	Description
input	string	"api", "apis"	Specifies the endpoint type definition root directory
baseURL	string	""	Specify baseURL of the request
trailingSlash	boolean	false	Append / to the request URL
outputEachDir	boolean	false	Generate $api.ts in each endpoint directory

Node.js API

import { version, build, watch } from "aspida/dist/commands"

console.log(version()) // 0.x.y

build()
build("./app/aspida.config.js")
build({ input: "api1" })
build([
  { baseURL: "https://example.com/v1" },
  {
    input: "api2",
    baseURL: "https://example.com/v2",
    trailingSlash: true,
    outputEachDir: true
  }
])

watch()
watch("./app/aspida.config.js")
watch({ input: "api1" })
watch([
  { baseURL: "https://example.com/v1" },
  {
    input: "api2",
    baseURL: "https://example.com/v2",
    trailingSlash: true,
    outputEachDir: true
  }
])

Tips

1. Change the directory where type definition file is placed to other than "api"
2. Serialize GET parameters manually
3. POST with FormData
4. POST with URLSearchParams
5. Receive response with ArrayBuffer
6. Convert from OpenAPI / Swagger
7. Define endpoints that contain special characters
8. Import only some endpoints
9. Retrieve endpoint URL string
10. Reflect TSDoc comments
11. Use mock
12. Use with SWR (React Hooks)
13. Use with SWRV (Vue Composition API)

Change the directory where type definition file is placed to other than "api"

Create a configuration file at the root of the project

aspida.config.js

module.exports = { input: "src" }

Specify baseURL in configuration file

module.exports = { baseURL: "https://example.com/api" }

If you want to define multiple API endpoints, specify them in an array

module.exports = [
  { input: "api1" },
  { input: "api2", baseURL: "https://example.com/api" }
]

Serialize GET parameters manually

aspida leaves GET parameter serialization to standard HTTP client behavior
If you want to serialize manually, you can use config object of HTTP client

src/index.ts

import axios from "axios"
import qs from "qs"
import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(
    aspida(axios, { paramsSerializer: params => qs.stringify(params, { indices: false }) })
  )

  const users = await client.v1.users.$get({
    // config: { paramsSerializer: (params) => qs.stringify(params, { indices: false }) },
    query: { ids: [1, 2, 3] }
  })
  console.log(users)
  // req -> GET: /v1/users/?ids=1&ids=2&ids=3
  // res -> [{ id: 1, name: "taro1" }, { id: 2, name: "taro2" }, { id: 3, name: "taro3" }]
})()

POST with FormData

api/v1/users/index.ts

export type Methods = {
  post: {
    reqFormat: FormData

    reqBody: {
      name: string
      icon: Blob
    }

    resBody: {
      id: number
      name: string
    }
  }
}

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(aspida())

  const user = await client.v1.users.$post({
    body: {
      name: "taro",
      icon: imageBlob
    }
  })
  console.log(user)
  // req -> POST: h/v1/users
  // res -> { id: 0, name: "taro" }
})()

POST with URLSearchParams

api/v1/users/index.ts

export type Methods = {
  post: {
    reqFormat: URLSearchParams

    reqBody: {
      name: string
    }

    resBody: {
      id: number
      name: string
    }
  }
}

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(aspida())

  const user = await client.v1.users.$post({ body: { name: "taro" } })
  console.log(user)
  // req -> POST: /v1/users
  // res -> { id: 0, name: "taro" }
})()

Receive response with ArrayBuffer

api/v1/users/index.ts

export type Methods = {
  get: {
    query: {
      name: string
    }

    resBody: ArrayBuffer
  }
}

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(aspida())

  const user = await client.v1.users.$get({ query: { name: "taro" } })
  console.log(user)
  // req -> GET: /v1/users/?name=taro
  // res -> ArrayBuffer
})()

Convert from OpenAPI / Swagger

Compatible with yaml/json of OpenAPI3.0/Swagger2.0

tarminal

$ npx openapi2aspida -i https://petstore.swagger.io/v2/swagger.json
# api/$api.ts was built successfully.

Docs of openapi2aspida

Define endpoints that contain special characters

Special characters are encoded as percent-encoding in the file name
Example ":" -> "%3A"

api/foo%3Abar/index.ts

export type Methods = {
  get: {
    resBody: string
  }
}

With clients, "%3A" -> "_3A"

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(aspida())

  const message = await client.foo_3Abar.$get()
  console.log(message)
  // req -> GET: /foo%3Abar (= /foo:bar)
})()

Import only some endpoints

If you don't need to use all of api/$api.ts , you can split them up and import only part of them
outputEachDir option generates $api.ts in each endpoint directory
$api.ts will not be generated under the directory containing the path variable

aspida.config.js

module.exports = { outputEachDir: true }

Import only $api.ts of the endpoint you want to use and put it into Object

src/index.ts

import aspida from "@aspida/axios"
import api0 from "../api/v1/foo/$api"
import api1 from "../api/v2/bar/$api"
;(async () => {
  const aspidaClient = aspida()
  const client = {
    foo: api0(aspidaClient),
    bar: api1(aspidaClient)
  }

  const message = await client.bar._id(1).$get()
  // req -> GET: /v2/bar/1
})()

Retrieve endpoint URL string

src/index.ts

import aspida from "@aspida/axios"
import api from "../api/$api"
;(async () => {
  const client = api(aspida())

  console.log(client.v1.users.$path())
  // /v1/users

  console.log(client.vi.users.$path({ query: { limit: 10 } }))
  // /v1/users?limit=10

  console.log(client.vi.users.$path({
    method: 'post',
    query: { id: 1 }
  }))
  // /v1/users?id=1
})()

Reflect TSDoc comments

api/index.ts

/**
 * root comment
 * 
 * @remarks
 * root remarks comment
 */
export type Methods = {
  /**
   * post method comment
   * 
   * @remarks
   * post method remarks comment
   */
  post: {
    /** post query comment */
    query: { limit: number }

    /** post reqHeaders comment */
    reqHeaders: { token: string }

    reqFormat: FormData
    /** post reqBody comment */
    reqBody: UserCreation

    /**
     * post resBody comment1
     * post resBody comment2
     */
    resBody: User
  }
}

$ npm run api:build

api/$api.ts

/**
 * root comment
 * 
 * @remarks
 * root remarks comment
 */
const api = <T>({ baseURL, fetch }: AspidaClient<T>) => {
  return {
    /**
     * post method comment
     * 
     * @remarks
     * post method remarks comment
     * 
     * @param option.query - post query comment
     * @param option.headers - post reqHeaders comment
     * @param option.body - post reqBody comment
     * @returns post resBody comment1
     * post resBody comment2
     */
    $post: (option: { body: Methods0['post']['reqBody'], query: Methods0['post']['query'], headers: Methods0['post']['reqHeaders'], config?: T }) =>
      fetch<Methods0['post']['resBody']>(prefix, PATH0, POST, option).json().then(r => r.body)
  }
}

Use mock

GitHub aspida-mock

Use with SWR (React Hooks)

GitHub @aspida/swr

Use with SWRV (Vue Composition API)

GitHub @aspida/swrv

Support

License

aspida is licensed under a MIT License.