Generate a random string in JavaScript
In this short article, you will learn how to generate a random string in JavaScript. We’ll learn how to make strings of arbitrary length by selecting characters at random from A-Z, a-z, and 0-9. There are multiple ways to generate a random string but we will look at two of them.
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Ways to generate a random string in JavaScript
1. Generate a random string from characters
The Math.random() function is used in this example to get random characters from the provided characters (A-Z, a-z, 0-9).
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | // declare the list of characters const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; function generateString(length) { let result = ''; const charactersLength = characters.length; for ( let i = 0; i < length; i++ ) { result += characters.charAt(Math.floor(Math.random() * charactersLength)); } return result; } generateString(5); // Output: 5DYmV |
2. Built-in methods to generate a random string
Now let’s use the built-in methods to generate a random string.
1 2 3 4 5 6 | function generateString(length) { const result = Math.random().toString(36).substring(2, length + 2) return result; } generateString(5); // Output: ynbos |
The Math.random() function provides a random value between 0 and 1.
The toString(36) method, 36 represents base 36. The toString(36) represents digits beyond 9 by letters.
The substring() method returns number of characters.
That’s it for today.
Thank you for reading. Happy Coding..!! 🙂
