✅ 1. Philosophy (How They Think)

Tool Philosophy Mental Model
Sequelize ORM that maps JS classes → SQL tables “I will write models in JS and tell relations using .hasMany() etc.”
Prisma Schema-first, query-builder + ORM “I describe DB shape in a .prisma file, Prisma generates types & API.”

Sequelize = Dynamic ORM

Prisma = Generated & Type-Safe ORM

✅ 2. Defining Models (Huge Difference)

Sequelize

const User = sequelize.define("User", {
  id: { type: DataTypes.UUID, primaryKey: true },
  name: DataTypes.STRING,
});

Prisma

model User {
  id   String @id @default(uuid())
  name String
}

Interpretation

Point Sequelize Prisma
Where schema lives? In JS code In .prisma file
DB source of truth? Models Schema file
Type safety Weak/Manual Strong & Automatic

✅ 3. Relations (Difference You Will Feel Immediately)

Sequelize

User.hasMany(Post);
Post.belongsTo(User);

Prisma

model User {
  posts Post[]
}

Prisma automatically handles foreign keys, cascade behavior, constraints — cleaner and safer.

✅ 4. Querying