Having used GraphQL for quite some time, two of my favorite patterns are:

• Context as a class

• Abstracting complexity into **Service APIs **via context.services

*Note: *You can find the source code for the this screenshot & demo at: https://github.com/ericclemmons/graphql-context-services/

Rationale

• Using Context (instead of a plain {…} object) moves complexity from within your GraphQL middleware to a separate, testable layer.

• Context can have a strict, testable API for your resolvers to use, instead of ad-hoc reliance on req.query or req.body .

• API calls within resolvers are simplified, as their only responsibility is to shepherd arguments from the query to the service layer.

• You can leverage Apollo’s dataSources, even with the standard express-graphql library!

That’s it!

If you haven’t already, view & play with this example on CodeSandbox.

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