The console.log() function is throwing an error message, saying, "Cannot read properties of undefined (reading 'log')"

I'm currently working on a NestJS application and running into an issue with the console.log function. No matter what I input, I keep getting this error:

[Nest] 71101  - 04/03/2023, 2:14:45 PM   ERROR [ExceptionsHandler] Cannot read properties of undefined (reading 'log')

Even something as simple as console.log("OK"); triggers the error.

I'm unsure of the potential causes for this problem and would like guidance on how to debug it.

The code surrounding the console.log call is minimal. Even when placed at the beginning of a function, the error persists. Although I have a Winston logger set up in my code, it's not being utilized in this service:

var winston = require('winston');
var config = {
  host: '',
  port: 2,
  timeout: 3.0,
  requireAckResponse: false, 
};
var fluentTransport = require('fluent-logger').support.winstonTransport();
var fluent = new fluentTransport('docker_logs', config);

const logger = winston.createLogger({
  level: 'verbose',
  format: winston.format.json(),
  defaultMeta: { service: 'service' },
  transports: [
    fluent,
  ],
});
export default logger;

Answer №1

When working in JavaScript, it's important to be aware that anyone can override your native objects and functions. One common example is overriding the console.log function:

 const originalLog = console.log;
 window.console.log = (...args) => originalLog.call(console, 'prefix', ...args);

To prevent this from happening, you can inspect your console object in the browser's inspector tool. You can also override setters for window.console to trigger the debugger if someone tries to change it:

const console= window.console; 
Object.defineProperty(window, 'console', {
  get() {
    return console;
  },
  set(newValue) {
      debugger;
  },
  enumerable: true,
  configurable: true,
});

It's recommended to implement these safeguards early on in your code, possibly at the beginning of your HTML file. Additionally, consider applying the same approach for other potentially overridden functions, such as window.console.log.

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