Understanding the Error: await is only valid in async function in JavaScript

Learn why you're encountering the "await is only valid in async function" error in your JavaScript code and how to properly use async and await for handling asynchronous operations.
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Understanding the Error: await is only valid in async function in JavaScript

When working with JavaScript to handle asynchronous operations, you might have encountered the "await is only valid in async function" error. This error can be perplexing, especially for developers who are new to the world of asynchronous programming in JavaScript. In this post, we will delve into why this error occurs and how to resolve it.

The Purpose of async and await

Before addressing the error, it's essential to understand what async and await do.

async Function: The async keyword is used to define a function that will handle asynchronous operations. When a function is marked with async, it implicitly returns a promise, and it can use the await keyword within its body.

await Keyword: The await keyword can be placed before a promise to pause the execution of the async function until the promise settles (either resolves or rejects). It's a way to write asynchronous code that looks synchronous, improving readability.

Why the Error Occurs

The error "await is only valid in async function" occurs because JavaScript requires that await only be used inside an async function. Attempting to use await outside of an async function results in this error.

Example of Incorrect Usage

[[See Video to Reveal this Text or Code Snippet]]

In this example, await is used in a regular function (getData) that is not marked with async, hence the error.

Resolving the Error

To fix this error, you need to ensure that you are using await within a function that is declared with the async keyword.

Example of Correct Usage

[[See Video to Reveal this Text or Code Snippet]]

Here, by marking getData as an async function, the await keyword is used correctly. The function now returns a promise that will resolve to the data fetched from the API.

Conclusion

The "await is only valid in async function" error in JavaScript is a common hurdle for developers working with asynchronous code. By ensuring that await is used within an async function, you can avoid this error and write more readable and maintainable asynchronous code. Remember to always define your asynchronous functions with the async keyword when you need to use await within them.

Understanding and mastering async and await can significantly enhance your ability to handle asynchronous operations in JavaScript, making your code cleaner and more intuitive.