How to count the correct length of a string with emojis in javascript?

I’ve a little problem. I’m using NodeJS as backend. Now, an user has a field “biography”, where the user can write something about himself. Suppose that this field has 220 maxlength, and suppose this as input: As you can see there aren’t 220 emojis (there are 37 emojis), but if I do in my nodejs server where bio is the input text, I got 221. How could I “parse” the string input to get the correct length? Is it a problem about unicode? SOLVED I used this library: I tried that: and the length is 37. It works very