Catching console.log in node.js?

Question

Is there a way that I can catch eventual console output caused by console.log(...) within node.js to prevent cloggering the terminal whilst unit testing a modu

Answer 1

capture-console solves this problem nicely.

var capcon = require('capture-console');

var stderr = capcon.captureStderr(function scope() {
  // whatever is done in here has stderr captured,
  // the return value is a string containing stderr
});

var stdout = capcon.captureStdout(function scope() {
  // whatever is done in here has stdout captured,
  // the return value is a string containing stdout
});

and later

Intercepting

You should be aware that all capture functions will still pass the values through to the main stdio write() functions, so logging will still go to your standard IO devices.

If this is not desirable, you can use the intercept functions. These functions are literally s/capture/intercept when compared to those shown above, and the only difference is that calls aren't forwarded through to the base implementation.