How To Extend Express Request Interface in Typescript

You will likely be caught in this situation where you create middleware that processes the request data before it reaches the resource route. Creating your own index.d.ts will help you add in additional properties easily.

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TS2339: Property 'user' does not exist on type 'Request' · Issue #46861 · DefinitelyTyped/DefinitelyTyped · GitHub

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Can't use custom type for Request and Response objects in Express 5 · Issue #5227 · expressjs/express · GitHub

How To Extend Express Request Interface in Typescript

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Can't extend express Request type · Issue #745 · TypeStrong/ts-node · GitHub