Passing request parameter into middleware which uses ‘createHandler’ function of ‘graphql-http’

Question

I have created an express server which uses GraphQL for handling requests over HTTP. Among others, the express server has the two middlewares below.

app.use(authenticate);

app.use('/graphql', createHandler({ schema }));

The authenticate middleware invokes a function which has req, res and next as parameters and in certain conditions assigns a value to req.user.

How can I pass the req object into the next middleware which is responsible for handling GraphQL requests?

I’ve searched for it in graphql-http’s documentation but no luck. Any help will be appreciated.
Link to the package’s documentation: https://github.com/graphql/graphql-http#with-express

Please share enough code. Otherwise we have to guess what exactly you are doing here — 4 hours ago
I'll try to be more explanatory. In the authenticate middleware I'm checking if the incoming request contains a session parameter in it's headers. If it does, I search in the db for that user and if I find him, I set req.user = userFound and call next(). What I want to do, is pass the request object in the next middleware in the chain, which is the one handling GraphQL requests. Thanks in advance. — 2 hours ago

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