Let’s say the following is our object −
var details = { firstName: 'John', lastName: '', countryName: 'US' }
Use Object.keys() along with find() to get the key name with empty value. Following is the code −
Example
var details = { firstName: 'John', lastName: '', countryName: 'US' } var result = Object.keys(details).find(key=> (details[key] === '' || details[key] === null)); console.log("The key is="+result);
To run the above program, you need to use the following command −
node fileName.js.
Output
Here, my file name is demo118.js. This will produce the following output −
PS C:\Users\Amit\JavaScript-code> node demo118.js The key is=lastName