Generate a unique ID in Javascript
In this tutorial, we are going to see how to generate a unique ID. JavaScript does not have a built-in method for generating unique identifiers, but you can use a method called Math.random() which generates a unique alphanumeric string on each call.
How to Generate a unique ID in Javascript
<!DOCTYPE html> <html> <body> <p>Click on the button to generate a unique ID.</p> <button onclick="generate()">Click here</button> <p id="uniqueID"></p> <script> function generate() { let id = () => { return Math.floor((1 + Math.random()) * 0x10000) .toString(16) .substring(1); } document.getElementById("uniqueID").innerHTML = id(); } </script> </body> </html>
Result |
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Click on the button to generate a unique ID. |
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This is not unique.
Let us not confuse unique with random!