server.js

const express = require("express");
const app = express();
const mongoose = require("mongoose");
const cors = require("cors");
require("dotenv").config();

const conn = mongoose.connect(process.env.MONGO_URI, {
  useUnifiedTopology: true,
  useNewUrlParser: true,
  useFindAndModify: false,
});
mongoose.connection.on("connected", () => {
  console.log("MongoDB connected");
});
mongoose.connection.on("error", (error) => {
  console.log(error);
});

require("./models/User");
require("./models/Post");

app.use(express.json({ extended: false }));
app.use(cors());

app.use("/api/auth", require("./routes/auth"));
app.use("/api/users", require("./routes/user"));
app.use("/api/posts", require("./routes/post"));

if(process.env.NODE_ENV === "production") {
  app.use(express.static('client/build'))
  const path = require('path')
  app.get("*", (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'))
  })
}

app.listen(process.env.PORT || 5000, () => {
  console.log(`Server running on port: ${process.env.PORT}`);
});