MERN-STACK-BACKEND

Frontend Repo

Backend URL

Model View Controller

Model: Data
View: UI (N/A here because we're usin React)
Controller: Logic

SQL vs NoSQL

tables and records (SQL) are called collections and documents in NoSQL

SQL: Relational Databases (MySQL, Postgres, SQLite, Oracle, Microsoft SQL Server) enforces strict data schema Relations are a core feature... Records are related
NoSQL: Non-Relational Databases (MongoDB , Firebase, DynamoDB, Cassandra, etc) enforces no data schema Less focus on relations ...independent documents

Common Use Cases

SQL: shopping carts, contacts, users, etc
NoSQL: blog posts, comments, messages, etc

mongodb+srv://bgoonz:Ruletheweb2023!@cluster0.tf5ehoc.mongodb.net/?retryWrites=true&w=majority

https://cloud.mongodb.com/v2/643dc6f4d31bc92e7f8dc9b6#/metrics/replicaSet/643dc73e81f8fc67caa856d3/explorer/test

Application Data:

Users

name
email
password
image

Places

title
description
address
Location
image
One user can create multiple places and one place can be created by only a single user.

Authentication

Hashing Passwords (done one backend)

npm install bcryptjs

in the code below hashedPassword = await bcrypt.hash( password, 12 ); 12 is the number of rounds of hashing (salting) we want to do. the more rounds the more secure the password but the longer it takes to hash the password.

let hashedPassword;
try {
  hashedPassword = await bcrypt.hash(password, 12);
} catch (err) {
  const error = new HttpError(
    "Could not create user, error hashing password.",
    500
  );
  return next(error);
}

Generating Tokens (done on backend)

npm install jsonwebtoken

Generating Tokens Example

let token;
// jwt.sign() is not a promise but it could fail so we still wrap it in a try catch
try {
  // jwt.sign() returns a string that will serve as our token
  // jwt.sign() takes 3 arguments (payload, secret, options)
  //createdUser.id is the id generated by mongoose
  token = jwt.sign(
    { userId: createdUser.id, email: createdUser.email },
    "supersecret",
    { expiresIn: "1h" }
  );
} catch (err) {
  const error = new HttpError("Signup failed, please try again.", 500);
  return next(error);
}

bgoonz / MERN-STACK-BACKEND