javascript return error from catch code example

Example 1: try catch javascript

try {
  // code may cause error
} catch(error){
  // code to handle error
}

Example 2: try catch throwing error in javascript

let json = '{ "age": 30 }'; // incomplete data

try {

  let user = JSON.parse(json); // <-- no errors
  alert( user.name ); // no name!

} catch (e) {
  alert( "doesn't execute" );
}