Please check if the following works

Here’s a step-by-step verification based on your code:

Server (server.js)

import express from 'express';
import dotenv from 'dotenv';
import colors from 'colors';
import connectDB from './config/db.js';
import testRoutes from './routes/testRoutes.js';
import cors from 'cors';
import morgan from 'morgan';

// dotenv config
dotenv.config();
connectDB();

// rest object
const app = express();

// middlewares
app.use(cors());
app.use(express.json());
app.use(morgan('dev'));

// routes
app.use("/api1/v1/test", testRoutes);

// port
const PORT = process.env.PORT || 8080;
app.listen(PORT, () => {
  console.log(`node server running in ${process.env.DEV_MODE} mode on route ${PORT}`.bgBlue);
});

Routes (testRoutes.js)

import express from "express";
import { testPostController } from "../controllers/testController.js";
const router = express.Router();

// routes
router.post("/test-post", testPostController);

export default router;

Controller (testController.js)

export const testPostController = (req, res) => {
  const { name } = req.body;
  res.status(200).send(`Your Name Is ${name}`);
};

Additional Checks:

• Import Paths:
  Ensure the import paths are correct and the files are in the expected directories.
• Environment Variables:
  Check that the .env file is correctly configured and accessible by the dotenv.config() call.
• Network Issues:
  Make sure there are no network issues or port conflicts on your local machine.

By following these steps, you should be able to identify and resolve the 404 error. If the issue persists, please provide any error logs or console messages you are seeing for further assistance.