How to Properly Alert Database Records Using Fetch JavaScript API and PHP

Learn how to effectively use the Fetch JavaScript API and PHP to retrieve and alert database records. This guide addresses common issues and provides a clear solution for displaying data.
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How to Properly Alert Database Records Using Fetch JavaScript API and PHP

When fetching records from a database and displaying them using alerts in JavaScript, it can be frustrating to see nothing or an empty alert. If you have encountered this issue, don’t worry — you’re not alone! In this guide, we’ll explore a common problem faced by developers working with the Fetch API in JavaScript and PHP, and we’ll break down the solution step-by-step.

The Problem

You may have written code to retrieve data from your server using the Fetch API. However, when you attempt to alert the id and name fields from the returned data, nothing shows up. This issue can be tied to how you're handling the JSON response from the server.

Here’s a summary of the situation you might be facing:

Empty Alerts: Alerts show no data — they are empty.

Suspicion of Error: You may feel that an error lies in how you are chaining the promises with .then() on the response object.

Here’s a snippet of this problematic code:

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

In this snippet, the alerts for id and name do not function as expected.

Analyzing the Structure of the Response

Let's take a look at the expected JSON response from the database:

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

This indicates you should be able to access id and name within an object contained in an array.

The Solution: Fixing the Fetch Code

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

Key Changes Made

Looping Through Data: The forEach loop is executed on the JSON response array to alert each record’s id and name.

Error Handling Added: I included a .catch() block to catch any potential errors during the fetch process.

The Server-Side Code (PHP)

Here’s a reminder of how your PHP code should look to return the proper JSON response.

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

Important Notes

Ensure that your PHP code returns valid JSON and that there are no syntax errors in your database connection or response generation.

Conclusion