Скачать или смотреть Fixing Your Fetch Calls: Why .then(console.log) Doesn't Execute in Your React App

Learn why your fetch request's .then() might not be executing and how to fix it in your React application with a step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/67346553/ asked by the user 'kiko' ( https://stackoverflow.com/u/9571313/ ) and on the answer https://stackoverflow.com/a/67347007/ provided by the user 'Udendu Abasili' ( https://stackoverflow.com/u/9161549/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Fetch Requests in React: Why Your .then(console.log) May Not Execute

If you're a React developer, you may sometimes wonder why your console logs don't execute after making fetch calls. Recently, I encountered a similar issue while working on a URL shortener project. After updating the database, I expected my console to reflect that update, but it seemed my promise chain broke right at the .then() method. If you're facing a similar problem, let’s dive into how we can troubleshoot and fix it.

The Problem at Hand

When making a fetch request in React, it's common to expect the code within the .then() block to execute after a successful database update. The scenario I encountered was as follows:

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The main issue was that the .then(console.log) did not execute, leaving me puzzled as to what went wrong in my code.

Why Doesn't It Execute?

The primary reason that the console.log within .then() does not execute is that the server is not sending back a response. When your React app makes a fetch request, it waits for a response from the server. If a response is not received, the .then() block won't run. Here's how to resolve this issue step-by-step:

Step 1: Ensure the Server Sends a Response

In the server-side code, you need to send a response back after updating the database. Here’s how you can modify your code to include responses for both success and error scenarios:

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Step 2: Use Proper Fetch Syntax

When using the fetch API in React, it is essential to use a proper syntax that allows you to handle the response appropriately. If you aren't planning to extract the data from the response, you can still use .then() effectively. Here’s an improved version of your fetch request:

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Step 3: Setting Up a Proxy for Simplicity

For a better development experience, consider adding the backend link as a proxy in your package.json. This way, you don’t have to worry about the full path when making API calls:

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Now you can call the fetch like this:

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Conclusion

Debugging fetch requests can be tricky, but ensuring your server properly responds to requests is the key to making your React fetch calls work correctly. By following the steps outlined above, you can effectively resolve the issue of your console.log not executing after a fetch call. Now you can confidently update your database and see those updates reflected in your console! Happy coding!