Question

How to add leading zeros to a number in Node.js

Answer 1

function addLeadingZeros(num, len) {
  	return String(num).padStart(len, '0');
}

console.log(addLeadingZeros(7, 2)); 
console.log(addLeadingZeros(8, 3)); 
console.log(addLeadingZeros(9, 4)); 
console.log(addLeadingZeros(1000, 3)); 
  
  
  
  
/*
run:
  
07
008
0009
1000
  
*/

 

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