How to Upload and Display an Image Using Python Flask

Summary: Learn how to upload and display images in a Flask application by following this comprehensive guide. Perfect for developers looking to handle image uploads using Python Flask APIs.
---

How to Upload and Display an Image Using Python Flask

Handling image uploads can be a common yet tricky requirement for many web applications. Flask, the lightweight Python web framework, provides a simple and efficient way to upload and display images. In this guide, we will walk through the steps to upload an image in a Flask application and then display that image on a webpage.

Setting Up Your Flask Application

First and foremost, you need to set up your Flask application. If you don't already have Flask installed, you can install it using pip:

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

Creating the Flask App

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

In this code snippet, we initialize the Flask application and set an UPLOAD_FOLDER directory where the uploaded images will be stored.

Creating HTML Templates

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

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

Handling the Image Upload

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

In this code snippet:

The /upload route handles file uploads. It ensures that the file is present and allowed before saving it to the configured upload folder.

allowed_file is a helper function to check if the uploaded file is an image.

Testing Your Application

To test your application, run your Flask app by executing:

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

Conclusion

With just a few lines of code, you can create a Flask application that allows users to upload and display images. This guide covered setting up the Flask server, creating the necessary HTML templates, handling file uploads, and displaying the uploaded images. Flask's simplicity and extensibility make it an excellent choice for building web applications that require file uploads.