How to Access the Query String in Flask Routes?

Accessing the Query String in Flask Routes

In Flask, accessing the query string or query parameters received with an HTTP request is straightforward. The query string, which contains parameters and their values, is available in the Flask request object.

To retrieve the query string in a Flask route, you can use the request.args attribute, which is a MultiDict object. This object provides convenient access to query parameters as key-value pairs.

Example:

Consider the following Flask route:

<code class="python">@app.route('/data')
def data():
    user = request.args.get('user')
    return render_template('data.html', user=user)</code>

In this route, we retrieve the value of the user parameter using request.args.get('user') and then render the data.html template.

To access the entire query string as a string, you can use request.query_string. For instance, in the request:

example.com/data?abc=123&def=456

The request.query_string would return:

?abc=123&def=456

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