If you understand what is a CRUD, you can build 80% of existing applications today. In this tutorial, I will explain CRUD from scratch, with practical mindset, real-world examples and modern approach.
CRUD means:
Possible it may sound simple… but here is the reality:
Instagram, Amazon, Spotify, Netflix, WhatsApp → Everything is CRUD.
Posts, users, likes, orders, messages… are data that are created, read, updated and deleted.
If you master CRUD, youd know how to build real applications.
A lot of people learn CRUD this way:
“Here are 4 endpoints and it’s done.”
Error.
A CRUD does not go to endpoints, goes to think about data and flows.
Before writing code, always ask yourself:
We’re going to something that EVERY project has.
User - id - name - email - password - created_at - updated_at - active
With this, your head should be thinking:
@app.post("/users") def create_user(user: UserCreate): return db.create(user)
READ – Leer usuarios
@app.get("/users") def get_users(): return db.get_all()
Read one:
@app.get("/users/{id}") def get_user(id: int): return db.get_by_id(id)
UPDATE – Actualizar usuario
@app.put("/users/{id}") def update_user(id: int, user: UserUpdate): return db.update(id, user)
Tip:
⚠️ Update only the necessary fields, do not update the entire object.
@app.delete("/users/{id}") def delete_user(id: int): return db.disable(id)
Bulk Delete
Mark as activo = false
A real CRUD never is public.
Ejemplo:
Aquí es donde entra:
And that’s where CRUD becomes non-basics.
If you know how to make one, you know how to make them all.
CRUD lives to be used from UI:
So React, Vue or Angular don’t serve anything without a CRUD behind.
Crud is not boring.
Crud is:
If you really understand Crud, you can build any app.
