Post request isn't working in node.js express/mongoose - node.js

Question

I have a route to create a category and when I try to run it in postman it returns an error saying, "Cannot POST /api/category"
I have tried to run through my code again and again but I cannot see where is the problem.
Thank for your help in advance
My schema:
const mongoose = require("mongoose");
const CategorySchema = new mongoose.Schema({
user: {
type: mongoose.Schema.Types.ObjectId,
ref: "user",
},
categoryName: {
type: String,
required: true,
},
date: {
type: Date,
default: Date.now,
},
});
module.exports = Categories = mongoose.model("category", CategorySchema);
My route:
const express = require("express");
const router = express.Router();
const auth = require("../../middleware/auth");
const { check, validationResult } = require("express-validator");
const Category = require("../../models/Category");
// #route POST api/category
// #desc Create or update users category
// #access Private
router.post(
"/",
[auth, [check("categoryName", "Category name is required").not().isEmpty()]],
async (req, res) => {
console.log(categoryName);
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
}
);
module.exports = router;
this is the way my code is organized

Answer 1

Ok thanks to Molda I found the problem.
I was missing my route definition in my server.js file.
All good now, thank you for your help.
const express = require("express");
const connectDB = require("./config/db");
const app = express();
//Connect DB
connectDB();
// Init Middleware
app.use(express.json({ extended: false }));
app.get("/", (req, res) => res.send("API Running"));
// Define routes
app.use("/api/users", require("./routes/api/users"));
app.use("/api/auth", require("./routes/api/auth"));
app.use("/api/profile", require("./routes/api/profile"));
app.use("/api/category", require("./routes/api/category"));
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(`Server started on port ${PORT}`));