Resolving 'UnhandledPromiseRejectionWarning' in Node.js
The 'UnhandledPromiseRejectionWarning' error in Node.js occurs when a Promise in your application is rejected, but the rejection is not handled properly.
This warning indicates potential issues in your application’s error-handling logic, which can lead to unpredictable behavior or crashes.
The error message often includes a stack trace, showing where the unhandled rejection occurred.
To fix this issue, ensure that all Promises in your code have proper .catch() handlers to manage errors.
For example, if you are using fetch() to make an API call, add a .catch() block to handle any network or response errors: fetch(url).then(...).catch(err => console.error(err)).
If you are using async/await, wrap your code in try-catch blocks to catch any errors that occur during asynchronous operations.
For instance: try { const data = await fetchData(); } catch (err) { console.error(err); }.
Node.js also allows you to handle unhandled Promise rejections globally by using the process.on('unhandledRejection') event, but this should be used as a last resort for logging and debugging rather than replacing proper error handling in individual Promises.
By ensuring robust error handling in Promises and addressing all rejections, you can eliminate 'UnhandledPromiseRejectionWarning' errors and improve the reliability of your Node.js application.
