v3 (latest)

Migration

Express GraphQL

Migration from Express GraphQL

Installation

You can start with installing graphql-yoga package.

Terminal

yarn add graphql-yoga

Replace Express GraphQL’s middleware

You should replace Express GraphQL’s middleware with GraphQL Yoga’s;

const express = require('express');
- const { graphqlHTTP } = require('express-graphql');
+ const { createYoga } = require('graphql-yoga');
const { schema } = require('./schema');
 
const app = express();
 
-app.use('/graphql', graphqlHTTP(req => ({
-  schema: schema,
-  context: {
-    token: req.headers.authorization
-  },
-  graphiql: true,
-})));
 
+const yoga = createYoga({
+   schema,
+   context: (req) => ({ // Context factory gets called for every request
+      myToken: req.headers.get('authorization'),
+   }),
+   graphiql: true,
+})
+
+app.use('/graphql', yoga);
 
app.listen(4000);
console.log('Running a GraphQL API server at http://localhost:4000/graphql');

schema, context and other parameters can be passed dynamically per HTTP request. context parameter of GraphQL Yoga can be a factory function but schema cannot. So you should use @envelop/use-lazy-loaded-schema (opens in a new tab) for the same behavior.