How to use error handling in JavaScript

What to know about error handling in JavaScript

Try/catch blocks help apps recover from failures and provide better user feedback when something goes wrong. This chapter explains the concept, demonstrates a practical example, and gives you a guided exercise.

How to use error handling in JavaScript

Start with a small function, make inputs and outputs explicit, and test both normal and edge cases. Use browser developer tools to inspect values and errors as you build.

Example: error handling in JavaScript

Use this example as a starting point. Identify the part that controls the result, then adapt it to your own page or project.

try { JSON.parse(invalidJson); } catch (error) { console.error(error.message); }

Common questions about error handling

When should I use error handling?

Use this technique when it expresses the structure, styling, or behavior your page needs. Keep the implementation focused and test it with the surrounding content.

What should I practice next?

Build one small interaction that reads a value, validates it, updates the page, and handles an empty or invalid input.