@nozomuikuta/h3-cors

h3-native CORS event handler

Usage

Install package:

# npm
npm install @nozomuikuta/h3-cors

# yarn
yarn add @nozomuikuta/h3-cors

# pnpm
pnpm install @nozomuikuta/h3-cors

Import:

// ESM
import { defineCorsEventHandler } from '@nozomuikuta/h3-cors'

// CommonJS
const { defineCorsEventHandler } = require('@nozomuikuta/h3-cors')

Usage:

import { createServer } from 'http'
import { createApp } from 'h3'
import { defineCorsEventHandler } from '@nozomuikuta/h3-cors'

const app = createApp()
app.use(defineCorsEventHandler({ /* options */ }))
app.use('/', () => 'Hello world!')

createServer(app).listen(process.env.PORT || 3000)

Options

• origin is either of the following values to configure Access-Control-Allow-Origin CORS header
  • "*" (default)
  • "null"
  • array of strings or regular expressions
  • function that receives value of Origin header and returns boolean
    • If false is returned, an error is thrown
• methods is "*" or an array of HTTP methods to configures Access-Control-Allow-Methods CORS header (default: "*")
• allowHeaders is "*" or an array of HTTP headers to configure Access-Control-Allow-Headers CORS header (default: "*")
• exposeHeaders is "*" or an array of HTTP headers to configure Access-Control-Expose-Headers CORS header (default: "*")
• credentials is boolean to configure Access-Control-Allow-Credentials CORS header (default: false)
• maxAge is a string to configure Access-Control-Max-Age, or false to unset the header (default: false)
• preflight.statusCode is used to set event.res.statusCode for preflight request (default: 204)

interface CorsOptions {
  origin?: '*' | 'null' | (string | RegExp)[] | ((origin: string) => boolean)
  methods?: '*' | HTTPMethod[]
  allowHeaders?: '*' | string[]
  exposeHeaders?: '*' | string[]
  credentials?: boolean
  maxAge?: string | false
  preflight?: {
    statusCode?: number
  }
}

Utilities

You can import utility functions as well as event handler.

• isPreflight(event)
• isAllowedOrigin(origin, options)
• appendCorsPreflightHeaders(event, options)
• appendCorsActualRequestHeaders(event, options)

💻 Development

• Clone this repository
• Enable Corepack using corepack enable (use npm i -g corepack for Node.js < 16.10)
• Install dependencies using pnpm install
• Run interactive tests using pnpm dev

License

Made with 💛

Published under MIT License.