Question

How to check if a variable is a string in JavaScript

Answer 1

function isString(value){
   if (typeof value === 'string' || value instanceof String) {
       return true;
   }
   
   return false;
}
 
 
const s = "javascript";
const n = 84392;
 
console.log(isString(s)); 
console.log(isString(n)); 
 
console.log(isString('351')); 
    
        
        
        
/*
run:
    
true
false
true
    
*/

 

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Answer 2

const value = 'javascript';
  
if (typeof value === 'string' || value instanceof String) {
    console.log('string');
} else {
    console.log('not string');
}

    
    
    
/*
run:
    
string
    
*/

 

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