ExpressJS router not working

const express = require("express");
const database = require("../database.js")
const argon2 = require('argon2')
const router = express.Router();

router.post("/api/login", async (req, res) => {
    const data = await database.get_password(req.body.username)
    console.log("hei")
    if (data.success == false) {
        res.json({
            token: null,
            error: "User does not exist or password is wrong"
        })
        return
    }

    //check password
    const valid = await argon2.verify(data.password, req.body.password)
    if (valid) {
        res.json({
            token: data.token,
            error: null
        })
    } else {
        res.json({
            token: null,
            error: "User does not exist or password is wrong"
        })
    }
})

module.exports = router;

const api_login_router = require("./routes/login")
app.use("/api/login", api_login_router);