console.log javascript [Function]

December 16, 2022 by Tarik

If it’s a user defined function you can use:

console.log(callback.toString());

Otherwise you’ll just get something like [native code] since built in functions are not written in JavaScript.

Example:

function x(){}

// Prints "function x(){}"
(function(callback){ console.log(callback.toString()); })(x);