How to Pass URL Variables to Flask API

We will show how you can build a flask API that gets URL variables. Recall that when we would like to pass a parameter to the URL we use the following syntax:

Assume that we want to pass the name and the age. Then the URL will be:

http://127.0.0.1:5000?name=Sergio&age=40

We will provide an example of how we can pass URL variables and the URL will be:

http://127.0.0.1:5000/Sergio/40

Let’s provide the code of the Flask API with these two cases:

from flask import Flask, jsonify, request


app = Flask(__name__)


@app.route('/with_parameters')
def with_parameters():
    name = request.args.get('name')
    age = int(request.args.get('age'))
    return jsonify(message="My name is " + name + " and I am " + str(age) + " years old")


@app.route('/with_url_variables/<string:name>/<int:age>')
def with_url_variables(name: str, age: int):
    return jsonify(message="My name is " + name + " and I am " + str(age) + " years old")


if __name__ == '__main__':
    app.run()

Let’s see the GET requests in Postman.

With Parameters:

With Variables: