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.