javascript convert number with leading zero to string it change the decimal number to octal

4.2k Views Asked by CK8 At 04 April 2025 at 14:12

I try to convert a number with leading zero. JavaScript interpret the number with leading zero as octal number. But I would like to convert the number to string as decimal number and preserve the leading zero. Any idea?

<!DOCTYPE html>
 <html>
 <body>

<p>Click the button to display the formatted number.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
    function myFunction() {
    var num = 015;

    var n = Number(num).toString();
    document.getElementById("demo").innerHTML = n;
}
</script>

</body>
</html>

Original Q&A

There are 2 best solutions below

ravikumar533 On 29 December 2016 at 02:25

try below code

function pad(num, size) {
        var s = num + "";
        while (s.length < size) s = "0" + s;
        return s;
    }
    document.getElementById("demo").innerHTML = pad(15, 4);

output: 0015

Yichong On 29 December 2016 at 02:50

The parseInt() and parseFloat() functions parse a string until they reach a character that isn't valid for the specified number format, then return the number parsed up to that point. However the "+" operator simply converts the string to NaN if there is an invalid character contained within it. Just try parsing the string "10.2abc" with each method by yourself in the console and you'll understand the differences better.

+"42"; // 42
+"010"; // 10
+"0x10"; // 16

a = "0042";
alert(typeof +a); // number
alert(+a); // 42

javascript convert number with leading zero to string it change the decimal number to octal

There are 2 best solutions below

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