Verify if the variable is a non-empty string in JavaScript

Published on May 31, 2016 by abundantcode

Filed under JavaScript

Last modified May 31, 2016

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If you want to test if a variable that is defined is a non-empty string in JavaScript , you can use the typeof keyword to find if the type is a sring as well as check for the length of the string as shown below.

How to verify if the variable is a non-empty string in JavaScript ?

<script>
    var input = 'This is a test string';
    if (typeof input === 'string' && input.length > 0) {
        console.log('valid non-empty string');
    } else {
        console.log('Invalid string input');
    }
</script>

This will cause the else part to execute if the variable is non-empty string.

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