JAVASCRIPT

Express return JSON

res.status(200).json({ message: "Hello world" })

express return json

const express = require("express")
const port = process.env.PORT || 5000;

const app = express();

app.listen(port, () => console.log("Server startet at port ", port));

app.get("/api/goals", (req, res) => {
    res.status(200).json({ message: "Get goals" })
})

res.json in express

res.status(200).json({ message: "Hello world" })

res.json({token});

res.status(500).json('Server Error');

return res.status(400).json({
  errors: errors.array()
});