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Flask API JWT Authentication without database.

To get a token make a request to the auth resource:

POST /auth HTTP/1.1 Host: localhost:5000 Content-Type: application/json

{ "username": "joe", "password": "pass" }

The response should look similar to:

HTTP/1.1 200 OK Content-Type: application/json

{ "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZGVudGl0eSI6MSwiaWF0IjoxNDQ0OTE3NjQwLCJuYmYiOjE0NDQ5MTc2NDAsImV4cCI6MTQ0NDkxNzk0MH0.KPmI6WSjRjlpzecPvs3q_T3cJQvAgJvaQAPtk1abC_E" }

This token can then be used to make requests against protected endpoints:

GET /protected HTTP/1.1 Authorization: JWT eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZGVudGl0eSI6MSwiaWF0IjoxNDQ0OTE3NjQwLCJuYmYiOjE0NDQ5MTc2NDAsImV4cCI6MTQ0NDkxNzk0MH0.KPmI6WSjRjlpzecPvs3q_T3cJQvAgJvaQAPtk1abC_E

from flask import Flask
from flask_jwt import JWT, jwt_required, current_identity
from import safe_str_cmp
class User(object):
def __init__(self, id, username, password): = id
self.username = username
self.password = password
def __str__(self):
return "User(id='%s')" %
users = [
User(1, 'joe', 'pass'),
User(2, 'user2', 'abcxyz'),
username_table = {u.username: u for u in users}
userid_table = { u for u in users}
def authenticate(username, password):
user = username_table.get(username, None)
if user and safe_str_cmp(user.password.encode('utf-8'), password.encode('utf-8')):
return user
def identity(payload):
user_id = payload['identity']
return userid_table.get(user_id, None)
app = Flask(__name__)
app.debug = True
app.config['SECRET_KEY'] = 'super-secret'
jwt = JWT(app, authenticate, identity)
def protected():
return '%s' % current_identity
if __name__ == '__main__':
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