How to fix wrong get user method in sqlite in node js app?

Question

Node.js

I write Rest API on Node.js + Express.js
Sqlite database.
There is a method that gets one user by id. If I enter the user id in the request, which is in the database, then I can normally get it without any errors with status 200.
If I enter the wrong id, which is not in the database, then I do not get the user, but the status code is still 200 , errors are not handled for some reason
How can I fix the method to work correctly?

Valid id:


Incorrect id:


users.js:

const express = require('express')
const db = require("../database");
const router = express.Router()

//get single user
router.get("/api/user/:id", (req, res, next) => {
    let userId = [req.params.id];
    db.get(`SELECT * FROM user where id = ?`, userId, (err, row) => {
        if (err) {
            res.status(400).json({"error":err.message});
        }
        res.status(200).json(row);
    });
});

module.exports = router

server.js:

const express = require("express");
const app = express();


const router = require('./routes/users')

app.use(router)
// Server port
const PORT = 8000;
// Start server
app.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`)
});

database.js:

const sqlite3 = require('sqlite3').verbose();

const DBSOURCE = "database.db"

let db = new sqlite3.Database(DBSOURCE, (err) => {
    if (err) {
        // Cannot open database
        console.error(err.message)
        throw err
    } else {
        console.log('Connected to the SQLite database...')
    }
});


module.exports = db