Скачать или смотреть How to Display Backend Data in an Angular Frontend

Struggling to display data retrieved from your Node.js and Express backend in your Angular app? This guide explains how to send and render that data seamlessly in your HTML template.
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This video is based on the question https://stackoverflow.com/q/63116335/ asked by the user 'Isaac Agatep' ( https://stackoverflow.com/u/9907814/ ) and on the answer https://stackoverflow.com/a/63117012/ provided by the user 'LeBavarois' ( https://stackoverflow.com/u/1568195/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display Backend Data in an Angular Frontend: A Step-by-Step Guide

When developing a web application, especially one built using the MEAN stack (MongoDB, Express, Angular, and Node.js), one common challenge developers face is effectively displaying data retrieved from the backend in the frontend. If you have successfully fetched your desired data from a MongoDB database, but find it challenging to show this information in your Angular HTML template, you are not alone! In this guide, we'll walk through the steps to ensure that data flows correctly from the backend to the frontend, allowing your application to provide a seamless user experience.

Understanding the Problem

From your description, it seems you've mastered various aspects of fetching data from the backend. However, the challenges you're experiencing are as follows:

Your existing console.log within the Angular component is not displaying any output in the Chrome developer tools console.

Modifying the subscription method in your Angular service appears to be affecting the ability to retrieve data in the terminal.

Let's dive deeper into how to tackle these issues and ensure your data is correctly displayed on the webpage.

Step 1: Sending Data from the Backend

The first thing to fix is the Express route that handles fetching data from MongoDB. In your current implementation, you're returning the result without sending it to the frontend. Instead of using the return statement, you should use the res.send() method to send the results back to the client.

Corrected Backend Code: api.js

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

Step 2: Consuming the Data in Angular

With the backend now sending data properly, it’s time to make sure your Angular service is correctly receiving that data.

Service Code: users.service.ts

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

Component Code: user-view-portfolio.component.ts

Next, we should ensure that your component is set up to handle the incoming data properly:

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

Step 3: Displaying Data in the HTML Template

Finally, to display your data effectively within your HTML template, you can use Angular's binding and directive capabilities:

HTML Template Example

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Conclusion

By following these steps, you should now be able to retrieve data from your backend and display it in your Angular application's HTML template. Remember:

Always send the response using res.send() in your Express route to relay data to the frontend.

Ensure your Angular service captures the API's response correctly and that your component assigns the fetched data appropriately.

Finally, utilize Angular directives in your HTML to showcase the data dynamically.

If you run into any further issues or challenges, feel free to reach out for more assistance. Happy coding!