ReactJS componentDidCatch() Method

componentDidCatch() is a React lifecycle method used to handle errors in child components and prevent the entire app from crashing. It also allows side-effects like logging errors during the commit phase.

• Catches rendering errors in child components or lifecycle methods.
• Enables creation of Error Boundaries for graceful UI fallback.
• Allows logging errors to external monitoring services.
• Supports side-effects safely since it runs after the render phase.

Syntax:

componentDidCatch(error, info)

Parameters: It accepts two parameters i.e, error, and info as described below:

• error: It is the error that was thrown by the descendant component.
• info: It stores the componentStack trace of which component has thrown this error.

Create React Application

Follow the steps to create React application:

Step 1: Create a React application using the following command:

npx create-react-app foldername

Step 2: After creating your project folder i.e. folder name, move to it using the following command:

cd foldername

Project Structure: It will look like the following.

Example: Program to demonstrate the use of componentDidCatch() method.

Filename: App.js:  

Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output:

Reference: https://legacy.reactjs.org/docs/react-component.html#componentdidcatch