how to avoid removing the zeros in front of a number?

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Having the following array of numbers

[0001, 0002, 0003]

I try to print them and keep the zeros, I thought that converting the numbers to string would solve the issue, but this is not the case, here are some options that I have tried

[0001, 0002, 0003].forEach(number => console.log(''+number)) // '1', '2', '3'

I get the same result if I try any of

  • String(number)
  • number.toString()
  • number + ''

The result I expect is

// '0001', '0002', '0003'

Thanks in advance

Hope you are looking for this. Convert the array of Number to array of String with leading zeros.

var size = 5;
var arr = [1,2,3,4,50];
var newArr = arr.reduce((result,v) => {
newStr = String(v);
while(newStr.length < (size || 2))
  newStr = "0" + newStr;
return result;


Entering leading zeroes in Excel, How do I remove zeros in front of a number in Excel? Delete same number of leading zeros. 1. Select cells you want to delete the leading zeros, and click Kutools > Text > Remove by Position. See screenshot: 2. In the popping dialog, type the number of zeros you want to remove, check option, and you can preview the result in the Preview pane. 3. Click Ok or Apply, now the leading zeros are removed at once.

If the numbers in your array have a fixed length then you can use the following

function pad(num, size) {
 var s = num+"";
 while (s.length < size) s = "0" + s;
 return s;

pad(1,4) returns 0001

In your context :

[0001, 0002, 0003].forEach(number => console.log(pad(number,4)) //0001,0002,0003

Please keep in mind that this answer is helpful only if the integers have a fixed length.

Format numbers to keep leading zeros in Excel for the web, Why won't excel Let me put a zero in front of a number? Click the Data tab, then From Text/CSV next to the Get Data button. If you don’t see the Get Data button, go to New Query > From File > From Text and browse to your text file, then press Import. Excel will load your data into a preview pane. Press Edit in the preview pane to load the Query Editor.

I think formatters like these have been on SO somewhere but in ES6 you could do it something like this:

var format = len => num =>
	((new Array(len)).fill("0").join("")+num).slice(len*-1);


How to keep or delete leading zeros in Excel?, When you type numbers that begin with zeros, like in some personal identification numbers, phone numbers, credit card numbers, product codes, or postal codes, Excel removes these leading zeros. To prevent this, you can first apply the Text format to the cells before you type or paste the numbers. For starters, let's see how you can put 0 in front of a number in Excel, for example type 01 in a cell. For this, simply change the cell format to Text: Select the cell(s) where you want to prefix numbers with 0. Go to the Home tab > Number group, and select Text in the Number Format box.

How to stop Excel removing your zeros, Click OK. Then the leading zeros in selection are removed. Method 4 Use Convert to Number feature. Select the range cells which are filled by numbers with  Only works if you type in after changing the format. Add a new column. Highlight the column and change format to TEXT via right clicking and format cells. Take your zip codes or numbers clumn and copy it. Paste into Notepad (to get rid of formatting) Copy the notepad data and paste into your new Excel column.

How do I prevent Excel from removing leading zeros in product id or , Perhaps it shortens it, drops decimal places or removes the leading zeros? Very frustrating if you Duration: 2:55 Posted: Jan 24, 2013 Hide zero values returned by a formula. Select the cell that contains the zero (0) value. On the Home tab, click the arrow next to Conditional Formatting > Highlight Cells Rules Equal To. In the box on the left, type 0. In the box on the right, select Custom Format. In the Format Cells box, click the Font tab.

4 easy steps to keep the leading zero in Excel!, This includes any leading zeros for Product ID's or UPC's. Excel spreadsheet you most likely discovered that Excel re-formats your number to something else, by removing leading zeros, Add an Apostrophe in front of the number in the cell​.

  • Numbers are numbers, not strings - they don't retain leading zeros.
  • ['0001', '0002', ..], or search for "[javascript] zero pad number".
  • Is there a fixed format to your numbers in the array? Like they can be five 4 digits only?
  • This post describes the same problem from another approach:…
  • Check this for similar problems:… or this…
  • Nice idea but I am getting wrong results when values are for example 0012, 0013, for 0012 I am getting 0010 and for 0013 I am getting 0011
  • Then you have to update pad function and check that number is greater than 9 then add 2 '0' ans same as for 99 then add 1 '0'
  • @user615274 Yes, I checked that. For some reason, js is returning var x= "" + 0023 as 19, I will check that and update the answer
  • @ChintanKukadiya thats taken care by the while loop in the pad function.
  • @hack4mer if we use like this then achieve it. function pad(num) { var size = num < 10 ? 4 : num < 100 ? 3 : 2 var s = num+""; while (s.length < size) s = "0" + s; return s; } and call like pad(9)