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JavaScript Node.js Basics (2014) Building a Command Line Application Using try and catch

rd. ln.
rd. ln.
7,851 Points

In the catch block user call console.error to print out the error's message property. WHAT????

What is this even talking about?

app.js
var message = "This fucking sucks. He should find a new career other than teaching."
try {
var jsonString = 'This is not a JSON String';
var jsonObject = JSON.parse(jsonString);
} catch (error) {
  console.error(message);
}

3 Answers

William Li
PLUS
William Li
Courses Plus Student 26,868 Points

what it is talking about is var jsonObject = JSON.parse(jsonString); this statement can go wrong, you need to catch the exception and print its message property out with console.error.

Here's one way to do it.

var jsonString = 'This is not a JSON String';
try {
  var jsonObject = JSON.parse(jsonString);
} catch(error) {
  console.error(error.message);
};
Andrew Chalkley
STAFF
Andrew Chalkley
Treehouse Guest Teacher

The error passed in to the catch clause is an object. A variable encapsulated by an object that can be accessed by using dot notation is known as a property.

The error object has a property called message.

const jsonString = 'This is not a JSON String'; try { const jsonObject = JSON.parse(jsonString); } catch(error) { console.error(error.message); };