diff --git a/express/mau1-5427/.env.example b/express/mau1-5427/.env.example
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+++ b/express/mau1-5427/.env.example
@@ -0,0 +1,5 @@
+PORT=3001
+MONGO_USER=
+MONGO_PASSWORD=
+MONGO_HOSTNAME=
+DB_NAME=
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diff --git a/express/mau1-5427/README.md b/express/mau1-5427/README.md
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+# Semana 8: Crear y Listar productos con Mongoose
+
+Base de datos creada en MongoDB: `warehouse -> products`
+
+Crear producto, ejemplo:
+
+```bash
+curl --request POST \
+  http://localhost:3001/products \
+  --header "Content-Type: application/json" \
+  --data '{
+    "name": "Olive Oil Dispenser Bottle",
+    "description": "Leaflai oil bottle is made of lead-free glass and is 100% healthy and environmentally friendly.",
+    "tags": ["kitchen", "picnic", "home"],
+    "value": 15.99
+  }'
+```
+
+Listar productos:
+
+```bash
+http://localhost:3001/products
+```
diff --git a/express/mau1-5427/index.js b/express/mau1-5427/index.js
new file mode 100644
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+++ b/express/mau1-5427/index.js
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+import dotenv from "dotenv";
+dotenv.config();
+import express from "express";
+import mongoose from "mongoose";
+// router
+import { productRouter } from "./product/router.js";
+
+// environment variables
+const { PORT, MONGO_USER, MONGO_PASSWORD, MONGO_HOSTNAME, DB_NAME } = process.env;
+
+const MONGO_URI = `mongodb+srv://${MONGO_USER}:${MONGO_PASSWORD}@${MONGO_HOSTNAME}/?retryWrites=true&w=majority`;
+
+const app = express();
+app.use(express.json());
+
+app.get("/", (req, res) => {
+  res.send("API Running");
+});
+
+// set up router
+app.use("/products", productRouter);
+
+app.listen(PORT,
+  () => {
+    console.log(`Server running at port ${PORT} 💻`);
+    console.log(`http://localhost:${PORT}`);
+
+    mongoose.connect(MONGO_URI, {
+      dbName: `${DB_NAME}`
+    })
+  }
+)
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diff --git a/express/mau1-5427/package.json b/express/mau1-5427/package.json
new file mode 100644
index 0000000..72dea3e
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+++ b/express/mau1-5427/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "mau1-5427",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "dev":"node --watch index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^16.3.1",
+    "express": "^4.18.2",
+    "mongoose": "^7.3.1"
+  }
+}
diff --git a/express/mau1-5427/product/model.js b/express/mau1-5427/product/model.js
new file mode 100644
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--- /dev/null
+++ b/express/mau1-5427/product/model.js
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+import mongoose from "mongoose";
+import productSchema from "./schema.js";
+
+const productModel = mongoose.model("product", productSchema);
+
+export default productModel;
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diff --git a/express/mau1-5427/product/router.js b/express/mau1-5427/product/router.js
new file mode 100644
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+++ b/express/mau1-5427/product/router.js
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+import express from "express";
+import productModel from "./model.js";
+// crypto to generate the "product_id"
+import crypto from "crypto";
+
+export const productRouter = express.Router();
+
+// List / READ all
+productRouter.get("/", async (req, res) => {
+  const products = await productModel.find({}).limit(10);
+
+  res.status(200).json({
+    products
+  });
+});
+
+// CREATE
+productRouter.post("/", async (req, res) => {
+  const product_id = crypto.randomBytes(16).toString("base64url");
+
+  const productToSave = { ...req.body, product_id };
+
+  const createdProduct = await productModel.create(productToSave);
+
+  res.status(201).json({
+    product: createdProduct
+  });
+});
+
diff --git a/express/mau1-5427/product/schema.js b/express/mau1-5427/product/schema.js
new file mode 100644
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+++ b/express/mau1-5427/product/schema.js
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+import mongoose from "mongoose";
+import { Decimal128 } from "mongoose";
+
+const productSchema = mongoose.Schema( {
+  product_id: {
+    type: String,
+    unique: true,
+    required: true
+  },
+  name: {
+    type: String,
+    required: true,
+  },
+  description: {
+    type: String,
+    required: true
+  },
+  tags: {
+    type: [String]
+  },
+  value: {
+    type: Decimal128,
+    required: true
+  }
+})
+
+export default productSchema;
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