Answers for "how to check if a data is a string in javascript"

javascript check if var is string

if (typeof a_string === 'string') {
    // this is a string
}

check if value is a string javascript

let eventValue = event.target.value;

    if (/^\d+$/.test(eventValue)) {
      eventValue = parseInt(eventValue, 10);
    }

//If value is a string, it converts to integer. 

//Otherwise it remains integer.