Web Reference: Jun 7, 2017 · You're getting this error because there's no type definition for the user property in the the native express Request object. You should install the type definitions for the middleware you're using to add user to the request. Sep 14, 2024 · Property 'user' does not exist on type 'Request'. I quickly realized that this happens because Express's default Request object doesn't include a user property, and TypeScript wasn’t happy about it. To fix this, I extended the Request interface to add the user property. Here’s how I did it: namespace Express { interface Request { user?: Jan 3, 2026 · In this blog, we’ll demystify why this error happens and walk through step-by-step solutions to fix it—from quick workarounds to robust, scalable approaches using TypeScript’s type system. By the end, you’ll confidently extend Express types to avoid this error in any project.
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