Handling Errors with async/await
Handling errors in asynchronous JavaScript code is essential for building reliable applications. When you use async/await, you can write asynchronous code that looks and behaves much like synchronous code, making error handling more straightforward. Instead of relying on chained .then() and .catch() methods with promises, you can use a try/catch block to manage errors that occur during asynchronous operations. This approach helps you catch both promise rejections and unexpected issues in a single, unified way, improving code clarity and maintainability. The following example shows how to implement error handling in an async function using try/catch to manage potential failures when fetching data from an external API.
1234567891011121314async function fetchUserData(userId) { try { const response = await fetch(`https://api.example.com/users/${userId}`); if (!response.ok) { throw new Error(`Request failed with status ${response.status}`); } const data = await response.json(); return data; } catch (error) { console.error("Error fetching user data:", error.message); // Handle or rethrow error as needed throw error; } }
This code demonstrates how you can handle errors in asynchronous JavaScript functions by combining async/await with a try/catch block. When you declare a function as async, it allows you to use the await keyword inside the function to pause execution until a promise settles. In this example, the function fetchUserData takes a userId and tries to fetch user data from a remote API.
The try block wraps all await operations. If the fetch call fails due to network issues or if the response status is not OK, the function throws an error. This error is then caught by the catch block, where you can log the error or handle it in another way. By rethrowing the error after logging, you allow the calling code to handle the error further up the chain if needed.
Using try/catch with async/await ensures that both synchronous and asynchronous errors are managed in a consistent way, making your error handling more robust and your code easier to read. This approach helps you avoid unhandled promise rejections and keeps error flow clear and predictable in asynchronous operations.
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Handling errors in asynchronous JavaScript code is essential for building reliable applications. When you use async/await, you can write asynchronous code that looks and behaves much like synchronous code, making error handling more straightforward. Instead of relying on chained .then() and .catch() methods with promises, you can use a try/catch block to manage errors that occur during asynchronous operations. This approach helps you catch both promise rejections and unexpected issues in a single, unified way, improving code clarity and maintainability. The following example shows how to implement error handling in an async function using try/catch to manage potential failures when fetching data from an external API.
1234567891011121314async function fetchUserData(userId) { try { const response = await fetch(`https://api.example.com/users/${userId}`); if (!response.ok) { throw new Error(`Request failed with status ${response.status}`); } const data = await response.json(); return data; } catch (error) { console.error("Error fetching user data:", error.message); // Handle or rethrow error as needed throw error; } }
This code demonstrates how you can handle errors in asynchronous JavaScript functions by combining async/await with a try/catch block. When you declare a function as async, it allows you to use the await keyword inside the function to pause execution until a promise settles. In this example, the function fetchUserData takes a userId and tries to fetch user data from a remote API.
The try block wraps all await operations. If the fetch call fails due to network issues or if the response status is not OK, the function throws an error. This error is then caught by the catch block, where you can log the error or handle it in another way. By rethrowing the error after logging, you allow the calling code to handle the error further up the chain if needed.
Using try/catch with async/await ensures that both synchronous and asynchronous errors are managed in a consistent way, making your error handling more robust and your code easier to read. This approach helps you avoid unhandled promise rejections and keeps error flow clear and predictable in asynchronous operations.
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