wrong signature for req.body and next()

[its-dibo]

This is a regression in v5

import { NextFunction, Request, Response } from 'express';

export function someMiddleware(){
  return (req: Request, res: Response, next: NextFunction) => {
  
// Property 'body' does not exist on type 'Request<core.ParamsDictionary, any, any, core.Query, Record<string, any>>'.ts(2339)
req.body

// Property 'method' does not exist on type 'Request<core.ParamsDictionary, any, any, core.Query, Record<string, any>>'.ts(2339)
req.method 

// This expression is not callable.
// Type 'NextFunction' has no call signatures.ts(2349)
next()
}
}

Environment information

Version:

"dependencies": {
  "express": "^5.0.1",
"@types/express": "^5.0.0",
}

Platform:
Linux 3f32d8f1babe 6.11.0-17-generic #17~24.04.2-Ubuntu SMP PREEMPT_DYNAMIC Mon Jan 20 22:48:29 UTC 2 x86_64 GNU/Linux

Node.js version:
v22.12.0

[dpopp07]

I'm unable to reproduce. What version of Typescript are you using? Will you confirm your Express dependency versions?

npm ls express @types/express typescript

[aramis-it]

I think problem is:
link

req.body
The req.body property returns undefined when the body has not been parsed. In Express 4, it returns {} by default.

In my case get request body undefined. I don't know why body not parsed.
I solved this for my case:

      if (!req.body) {
          req.body = {}
      }

[bjohansebas]

If the body is not sent in the response, it will be undefined. That is one of the breaking changes that were made. Check the migration guide.

[its-dibo]

In my case get request body undefined. I don't know why body not parsed. I solved this for my case:

This is a breaking change, the body now is undefined instead of {}

[its-dibo]

What version of Typescript are you using?

$ pnpm ls express @types/express typescript --filter express
Legend: production dependency, optional only, dev only

@engineers/express@1.1.1 /workspaces/dibo/packages/express

dependencies:
express 5.0.1

devDependencies:
@types/express 5.0.0

[dpopp07]

This is a breaking change, the body now is undefined instead of {}

Correct - it is a breaking change introduced in v5 that is documented in the migration guide. I believe the purpose is to disambiguate between the user providing an empty body, and the app not parsing the body.

$ pnpm ls express @types/express typescript --filter express

By filtering on "express", the Typescript version is not shown 🙂

[its-dibo]

currently I don't use typescript in this package at all, as it meant to be imported directly in other apps without building, however I installed typescript but the same error still occurs

$ pnpm ls express @types/express typescript --filter express
Legend: production dependency, optional only, dev only

@engineers/express@1.1.1 /workspaces/dibo/packages/express

dependencies:
express 5.0.1

devDependencies:
@types/express 5.0.0
typescript 5.8.2

Env:

• Node: v22.14.0
• pnpm: 10.6.2

package.json

  "dependencies": {
    "express": "^5.0.1",
    "jsonwebtoken": "^9.0.2",
    "multer": "1.4.4",
    "parse-domain": "^8.2.2"
  },
  "devDependencies": {
    "@types/express": "^5.0.0",
    "@types/jsonwebtoken": "^9.0.7",
    "@types/multer": "^1.4.12",
    "semantic-release": "^24.2.1",
    "semantic-release-monorepo": "^8.0.2",
     "typescript": "^5.8.2"
  }