What is Uncaught (in promise) DOMException Error?
The error message “uncaught (in promise) DOMException” typically indicates an issue with a JavaScript Promise that has been rejected with a DOMException.
When you make use of Promises in JavaScript, the code is structured in a way that allows it to handle asynchronous operations without blocking the main thread. Promises represent a value that might not be available yet but will be resolved at some point in the future. A Promise can either be fulfilled with a value or rejected with a reason (which is usually an error object).
A DOMException is an object that represents an error that occurs while manipulating the Document Object Model (DOM) of a web page. Some common causes of DOMExceptions include attempting to access an element that doesn’t exist, trying to modify a read-only attribute, or trying to manipulate the DOM while it’s still loading.
Now, when you chain Promises together, each Promise in the chain can either fulfill or reject. When a Promise is rejected, it will “bubble up” to the next available catch() block. If there is no available catch() block, the error will be “unhandled” and will result in an error message being printed to the console. This is what is happening when you see the “uncaught (in promise) DOMException” error.
It’s also possible that the error is caused by a browser-specific issue or a bug in a third-party library. In this case, you may need to consult the documentation for the library or search for similar issues reported by other developers.
How to solve Uncaught (in promise) DOMException Error?
To handle this error, you need to ensure that you are always handling rejected Promises by using the catch() method to catch any errors that occur during the execution of the promise chain. By doing this, you can log the error, display an error message to the user, or take other appropriate actions.
Here’s an example of how you can catch a DOMException in a Promise chain:
fetch('https://example.com/data.json')
.then(response => {
if (!response.ok) {
throw new DOMException('Network response was not ok');
}
return response.json();
})
.then(data => {
// do something with the data
})
.catch(error => {
console.error('Error:', error);
// display an error message to the user
});
In this example, the fetch() function is used to retrieve data from an API. If the response is not successful (i.e., the ok property is false), a DOMException is thrown. This exception is caught in the catch() block, where it is logged to the console, and an error message can be displayed to the user.
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