apollo-server-express CORS issue

Question

So I am migrating to apollo-server-express 2.3.3 ( I was using 1.3.6 ) I've followed several guides, making the necessary tweaks but am stuck in a CORS issue.

According to the docs you have to use the applyMiddleware function to wire up the apollo server with express.

I am currently doing the following:

const app = express();

// CORS configuration

const corsOptions = {
    origin: 'http://localhost:3000',
    credentials: true
}

app.use(cors(corsOptions))

// Setup JWT authentication middleware

app.use(async (req, res, next) => {
    const token = req.headers['authorization'];
    if(token !== "null"){
        try {
            const currentUser = await jwt.verify(token, process.env.SECRET)
            req.currentUser = currentUser
        } catch(e) {
            console.error(e);
        }
    }
    next();
});

const server = new ApolloServer({ 
    typeDefs, 
    resolvers, 
    context: ({ req }) => ({ Property, User, currentUser: req.currentUser })
});

server.applyMiddleware({ app });


const PORT = process.env.PORT || 4000;

app.listen(PORT, () => {
    console.log(`Server listening on ${PORT}`);
})

For some reason my express middleware doesn't seem to be executing, when I try to do a request from localhost:3000 (client app) I get the typical CORS error

With apollo-server-express 1.3.6 I was doing the following without no issues:

app.use(
    '/graphql',
    graphqlUploadExpress({ maxFileSize: 10000000, maxFiles: 10 }),
    bodyParser.json(),
    graphqlExpress(({ currentUser }) => ({
        schema,
        context: {
            // Pass Mongoose models
            Property,
            User,
            currentUser
        }
    }))
);

Now with the new version, event tho the docs make this look like a straightforward migration I does't seem to make it work. I've checked various articles and no one seems to be having the issue.

Hope you guys can help me.

Cheers!

Answer 1

From my understanding of the Apollo Server middleware API, CORS options, body-parser options and the graphql endpoint are treated as special entities that must be passed directly to the applyMiddleware param object.

So you want to try the following configuration:

const app = express();

// CORS configuration
const corsOptions = {
    origin: 'http://localhost:3000',
    credentials: true
}

// The following is not needed, CORS middleware will be applied
// using the Apollo Server's middleware API (see further below)
// app.use(cors(corsOptions))

// Setup JWT authentication middleware
app.use(async (req, res, next) => {
    const token = req.headers['authorization'];
    if(token !== "null"){
        try {
            const currentUser = await jwt.verify(token, process.env.SECRET)
            req.currentUser = currentUser
        } catch(e) {
            console.error(e);
        }
    }
    next();
});

const server = new ApolloServer({ 
    typeDefs, 
    resolvers, 
    context: ({ req }) => ({ Property, User, currentUser: req.currentUser })
});

// There is no need to explicitly define the 'path' option in
// the configuration object as '/graphql' is the default endpoint
// If you planned on using a different endpoint location,
// this is where you would define it.
server.applyMiddleware({ app, cors: corsOptions });

const PORT = process.env.PORT || 4000;

app.listen(PORT, () => {
    console.log(`Server listening on ${PORT}`);
})