The Problem
I’ve been working on a Node.js project with TypeScript and Express.js. At one point, I needed to attach a user object to the Express Request object, but I ran into this TypeScript error:
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.
My Initial Fix
To fix this, I extended the Request interface to add the user property. Here’s how I did it:
// src/types/express.d.ts import { User } from '@prisma/client'; // Assuming User is a Prisma model declare global { namespace Express { interface Request { user?: User; // Add user to the Request interface } } }
{ "compilerOptions": { //extra options here "typeRoots": ["./node_modules/@types", "./src/types"] // Add the types folder } }
At this point, the error disappeared from my code editor, so I thought I had fixed the problem. But when I tried running the project, I hit another error in the terminal:
error TS2339: Property 'user' does not exist on type 'Request'.
Stuck for Days
I spent 3-4 days troubleshooting this, trying everything I could find online. I was completely stuck and couldn’t figure out why it wasn’t working.
The Solution
Finally, I discovered the root issue and fixed it with these steps:
npm install -g typescript
Run the TypeScript Compiler in Watch Mode: I used the --watch flag to automatically recompile my TypeScript code as I worked:
tsc --watch
Restart My Code Editor: I restarted my editor (VS Code in my case) to make sure everything was loaded properly.
Run the Project: After restarting, I ran the project again—and it worked!
Conclusion
What I thought would be a small issue turned into days of frustration, but I finally got it working! If you're facing similar problems with TypeScript not recognizing new properties on Express’s Request object, remember to:
Extend the Request interface correctly.
Make sure TypeScript’s compiler (tsc) is installed and running properly.
Hopefully, this helps anyone else who's been stuck like I was!
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