why use try catch in javascript code example

Example 1: node js try catch

try {
  nonExistentFunction();
} catch (error) {
  console.error(error);
  // expected output: ReferenceError: nonExistentFunction is not defined
  // Note - error messages will vary depending on browser
}

Example 2: catch error message js

try {
  // test code
} catch (error) { // if error
  console.error(error); // return error
}