Error: Module '"express"' has no exported member

[kaiunido]

Hi...

I'm using express 5.0.1 (tried with last 4.x too) and trying to use with module.

And change my package.json adding:

"exports": "./dist/index.js",
  "type": "module",
  "engines": {
    "node": ">=20"
  },

package.json dependencies and scripts:

"scripts": {
    "start": "tsc-watch --onSuccess \"node dist/index.js\""
  },
...
"dependencies": {
    ...
    "express": "^5.0.1",
    ...
  },
"devDependencies": {
    "@eslint/js": "^9.13.0",
    "@tsconfig/node20": "^20.1.4",
    "@types/express": "^5.0.0",
    "@types/node": "^22.8.1",
    "eslint": "^9.13.0",
    "eslint-config-prettier": "^9.1.0",
    "eslint-plugin-prettier": "^5.2.1",
    "globals": "^15.11.0",
    "tsc-watch": "^6.2.0",
    "typescript": "^5.6.3",
    "typescript-eslint": "^8.11.0"
  },

And my tsconfig:

{
  "extends": "@tsconfig/node20/tsconfig.json",
  "compilerOptions": {
    "rootDir": "src",
    "outDir": "dist",
    "sourceMap": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noEmitOnError": true,
    "strictNullChecks": true,
    "noUnusedLocals": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "resolveJsonModule": true
  },
  "compileOnSave": true,
  "include": ["src/**/*", "src/locales/**/*.json"],
  "exclude": ["**/*.spec.ts"]
}

I tried change types version, express version, make a lot of search but don't find any way to fix.
When I run with pnpm start i`m getting a lot of errors like:

(4,15): error TS2305: Module '"express"' has no exported member 'NextFunction'.
(4,29): error TS2305: Module '"express"' has no exported member 'Request'.
(4,38): error TS2305: Module '"express"' has no exported member 'Response'.
(1,15): error TS2305: Module '"express"' has no exported member 'Response'.
(3,15): error TS2305: Module '"express"' has no exported member 'Response'.
# this one is in the "import express from 'express'"
src/index.ts(1,8): error TS1192: Module '"U:/projects/express/src/index"' has no default export.

Is the same with import ... or import type ...

If anyone can give me some light or direction I would appreciate it.

Thank you... :D

[kaiunido]

If it helps, here is a repo with the minimum to reproduce the behavior: https://github.com/kaiunido/express-module-error

Edit: for a little more context, I was trying to test @auth/express and it is ESM only.

[Abdel-Monaam-Aouini]

you can enable esModuleInterop to allow importing default exports without explicit naming.
Add the following option to your tsconfig.json:

{
  "compilerOptions": {
    "esModuleInterop": true
  }
}

[kaiunido]

@Abdel-Monaam-Aouini this option is already enabled in the extended tsconfig:

"extends": "@tsconfig/node20/tsconfig.json",

---

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "_version": "20.1.0",

  "compilerOptions": {
    "lib": ["es2023"],
    "module": "node16",
    "target": "es2022",

    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "moduleResolution": "node16"
  }
}

[IamLizu]

Hi 👋

Its rather simple, in your package.json file you have defined the package name as express. It is causing a conflict. Please change it to something else and the app will work as expected.

[kaiunido]

Is it, thank you so much.
I created the test folder with "express" name and the pnpm init get the folder name for the name in package.json.
After rename in the package.json as you said, the problem was solved... =D

Thank you. ;)