JWT in Query String

You can also pass the token in as a paramater in the query string instead of as a header or a cookie (ex: /protected?jwt=<TOKEN>). However, in almost all cases it is recomended that you do not do this, as it comes with some security issues. If you perform a GET request with a JWT in the query param, it is possible that the browser will save the URL, which could lead to a leaked token. It is also very likely that your backend (such as nginx or uwsgi) could log the full url paths, which is obviously not ideal from a security standpoint.

If you do decide to use JWTs in query paramaters, here is an example of how it might look:

from flask import Flask, jsonify, request

from flask_jwt_extended import (
    JWTManager, jwt_required, create_access_token,
)

# IMPORTANT NOTE:
# In most cases this is not recommended! It can lead some some
# security issues, such as:
#    - The browser saving GET request urls in it's history that
#      has a JWT in the query string
#    - The backend server logging JWTs that are in the url
#
# If possible, you should use headers instead!

app = Flask(__name__)
app.config['JWT_TOKEN_LOCATION'] = ['query_string']
app.config['JWT_SECRET_KEY'] = 'super-secret'  # Change this!

jwt = JWTManager(app)


@app.route('/login', methods=['POST'])
def login():
    username = request.json.get('username', None)
    password = request.json.get('password', None)
    if username != 'test' or password != 'test':
        return jsonify({"msg": "Bad username or password"}), 401

    access_token = create_access_token(identity=username)
    return jsonify(access_token=access_token)


# The default query paramater where the JWT is looked for is `jwt`,
# and can be changed with the JWT_QUERY_STRING_NAME option. Making
# a request to this endpoint would look like:
# /protected?jwt=<ACCESS_TOKEN>
@app.route('/protected', methods=['GET'])
@jwt_required
def protected():
    return jsonify(foo='bar')

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