Checks if a string is a valid base64 encoded string. This is a utility Typescript function that can be copy & pasted into your codebase.

Step-By-Step Guide

1. Copy the Source Code


2 * Checks if a string is a valid base64 encoded string.
3 *
4 * @param str - The string to be checked.
5 * @returns A boolean indicating whether the string is base64 encoded or not.
6 */
7export function isBase64(str: string): boolean {
8	const base64Regex =
9		/^(?:[A-Za-z0-9+\/]{4})*?(?:[A-Za-z0-9+\/]{2}(?:==)?|[A-Za-z0-9+\/]{3}=?)?$/;
10	return base64Regex.test(str);

2. Use it in a file


1import { isBase64 } from '@/lib/utils'; 
3const encodedString = 'R290IFlhIQ==';
4console.log(isBase64(encodedString)); // Outputs: true

3. Examples


2import { isBase64 } from '@/lib/utils';
4export default function Page() {
5    const searchParams = useSearchParams();
6    const hopefullyBase64EncodedParam = searchParams.get('q');
8    if(!isBase64(hopefullyBase64EncodedParam)){
9        //Do something
10    }
11    return({/*YOUR CODE*/})

Tech Stack

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TypeScript ensures that your code is always correct. It is the best way to write JavaScript.

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