yea node is blocking, but in weird cases like this, you can defer

gistfile1.txt

// from this

app.get('/', function(req, res){

  for(var i = 0; i<100000; i++) {
    console.log(i); // your code here
  }
    
  res.send(true);

});

//to this
app.get('/', function(req, res){

  var done = function () {
    res.send(true);
  }
  
  var i=0;
  
  var iterate = function () {
    
    console.log(i); // Your code here
    
    if (i++ < 100000)
      // keep going
      setTimeout(iterate, 0);
    else
      done();
  }
  
  // start it
  iterate();
  
});

instead of setTimeout(iterate,0), process.nextTick(iterate) is probably faster and better