Error: Attempting to modify the ip property of an #<IncomingMessage> object that is read-only

Currently, I am in the process of developing a middleware that is intended to assign the user's IP address based on the cloudflare header provided. This method has worked successfully on previous projects of mine, but now it seems to be encountering issues.

Upon attempting to access the application, an error message is displayed:

TypeError: Cannot set property ip of #<IncomingMessage> which has only a getter
    at /media/chen/storage/development/urlshortener/index.ts:67:11
    at Layer.handle [as handle_request] (/media/chen/storage/development/urlshortener/node_modules/express/lib/router/layer.js:95:5)
    ... (additional error details omitted for brevity)

app.use((req, res, next) => {
  req.ip = req.header('cf-connecting-ip') || req.ip; // The problematic line mentioned in the error at Line 67
  next()
})

If necessary, I can provide more of my code. The snippet above covers everything except for the app.listen statement following the completion of setting up all routes, middlewares, and express configurations.

To clarify, I am utilizing Express version 4.17.1

typescriptexpresscloudflare

Answer №1

It seems like you are attempting to assign a value to a request property that is actually a getter method, as defined in the source code.

This action can result in an error when running in strict mode.

To illustrate:

(function() {
  'use strict';
  
  let obj = {};

  Object.defineProperty(obj, 'myProp', {
    configurable: true,
    enumerable: true,
    get: () => { return 'from getter' }
  });

  // In 'strict mode': Uncaught TypeError: Cannot set property myProp of #<Object> which has only a getter
  // Not in 'strict mode': Executed without errors and does not affect the `myProp` property.
  obj.myProp = 'explicitly set';

  // In 'strict mode': This line is never reached
  // Not in 'strict mode': Logs 'from getter'
  console.log(obj.myProp);
}());

To resolve this issue, consider creating a new property on the request object, such as req.endUserIp, and utilize that instead.

Since your question is related to TypeScript, it is recommended to extend the Request interface to include the new property as well.

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