v4IntegrationsKoa
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This is the documentation for the old GraphQL Yoga version 4. We recommend upgrading to the latest GraphQL Yoga version 5.

Migrate to GraphQL Yoga v5

Integration with Koa

Koa is a new web framework designed by the team behind Express, which aims to be a smaller, more expressive, and more robust foundation for web applications and APIs. GraphQL Yoga can be integrated easily as a route to the existing Koa application with a few lines of code. So you can benefit middlewares written for Koa with GraphQL Yoga.

Installation

npm i koa graphql-yoga graphql

Example

import { createYoga } from 'graphql-yoga'
import Koa from 'koa'
 
const app = new Koa()
 
const yoga = createYoga<Koa.ParameterizedContext>()
 
// Bind GraphQL Yoga to `/graphql` endpoint
app.use(async ctx => {
  // Second parameter adds Koa's context into GraphQL Context
  const response = await yoga.handleNodeRequest(ctx.req, ctx)
 
  // Set status code
  ctx.status = response.status
 
  // Set headers
  response.headers.forEach((value, key) => {
    ctx.append(key, value)
  })
 
  // Converts ReadableStream to a NodeJS Stream
  ctx.body = response.body
})
 
app.listen(4000, () => {
  console.log(`Running a GraphQL API server at http://localhost:4000/${yoga.graphqlEndpoint}`)
})

You can also check a full example on our GitHub repository here

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