Error handling middleware
ExpressJS is a framework that is renowned for its utilization of error-handling middleware in MERN applications. It effectively captures and manages exceptions within the code, logging the errors and providing descriptive messages back to the user.
In the following example, if the API returns an error without a description, the Express middleware can be implemented as follows.
function ErrorHandling(err, req, res, next) {
// Log the error
console.error(`Error: ${err.message}`);
// Error message
res.status(500).json({ error: 'Internal server error' });
}
app.use(ErrorHandling);
Introduction to Testing in MERN
Testing in MERN (MongoDB, ExpressJS, React, NodeJS) applications is important for ensuring the reliability, functionality, and stability of your software. Testing helps identify bugs early in the development process, maintain code quality, and build confidence in your application’s behavior.
In this article, you will be walking through the basics of testing in MERN.
Table of Content
- What is Testing?
- Unit testing
- Error handling middleware
- API testing
- UI testing
- Testing in MongoDB
- Testing in ExpressJS
- Testing in React
- Testing in NodeJS
- Conclusion