Python (Flask) example

from flask import Flask, request, jsonify from flask_sqlalchemy import SQLAlchemy from flask_bcrypt import Bcrypt from flask_login import LoginManager

app = Flask(name) db = SQLAlchemy(app) bcrypt = Bcrypt(app) login_manager = LoginManager(app)

User model

class User(db.Model): id = db.Column(db.Integer, primary_key=True) username = db.Column(db.String(30), unique=True, nullable=False) email = db.Column(db.String(120), unique=True, nullable=False) password = db.Column(db.String(60), nullable=False)

Register route

@app.route("/register", methods=['POST']) def register(): username = request.json.get('username') email = request.json.get('email') password = bcrypt.generate_password_hash(request.json.get('password')).decode('utf-8')

user = User(username=username, email=email, password=password)
db.session.add(user)
db.session.commit()

return jsonify(message="User created."), 201

Login route

@app.route("/login", methods=['POST']) def login(): user = User.query.filter_by(email=request.json.get('email')).first()

if user and bcrypt.check_password_hash(user.password, request.json.get('password')):
    login_user(user)
    return jsonify(message="Logged in successfully."), 200

return jsonify(message="Invalid credentials."), 401