halting after errors happen in catch

Question

I recently read about it is a good practice to write throw error when an error appears in order to stop dealing with the errant results. I am not sure if whether it applies to the server of a web app built with node.js and express. Should I handle all the .catch with throw error. Would throw error causes my app to crash?

Answer 1

The catch block is where you handle the error. In other words, this is where you could potentially trigger an alternate result from the function. Example:

try {
  const result = await fetchSomeData();
  if(result !== null) {  
    return result;
  }else{
    throw "nothing was fetched"
  }
} catch(error) {
  console.log(error);
  const result = { error: "a custom error message", function: customCallBack };
  return result;
}