How to Extract Named Parameters from a URL Query String in Flask?

Acquiring Named Parameters from a URL in Flask

When developing a Flask application, it's often necessary to extract named parameters from a URL query string. These parameters allow you to retrieve specific information entered by the user in their request.

Consider the following URL running on a Flask app:

http://10.1.1.1:5000/login?username=alex&password=pw1

In this scenario, you want your web service to capture the parameters specified after the question mark, which are "username" and "password" in this case. To achieve this, Flask provides a convenient solution.

Solution: Using request.args

Rather than using request.form, which is typically used for form data, you can access named parameters using request.args. This object contains the parsed contents of the query string.

To extract the "username" parameter:

username = request.args.get('username')

To extract the "password" parameter:

password = request.args.get('password')

These lines of code will assign the respective parameter values to the username and password variables, allowing you to manipulate and process them as needed in your application logic.

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