Its an online programming ide for the compilation of simple programs, Mostly used in competitive programming servers to run the code according to certain set of rules.

var runner = require('code-runner');
runner(code,options,function(){
  //callback function
  ...
});

• code is the code to be executed.
• options is an object which should contain the following properties :
  1. timeout : time in ms, specifies the time after which the program must be terminated.
  2. language : the name of the language of the given code.