Unable to mount domain.com/url as domain.com/ in Express + Nginx

[TracerDS]

Hey. Im using Nginx to host my main website (www.my.domain.name.com) and as a reverse proxy to the express app hosted in node (www.my.domain.name.com:8080).
I want to RP www.my.domain.name.com/api to express but I've encountered an issue:
When attaching function handler to the /, the express app looks at the path and ignores that handler.
Using app.use('/api', ...) should mount the function handler to domain.com/api/api path but it actually mounts it at domain.com/api instead.
Is there a way to somehow connect /api as / in express?

Connection steps:

1. Connect to the website
2. Nginx redirects you from domain.com/api to domain.com:8080
3. Express receives the request, looks at the path (/api) and mounts it as the root (/) path.

Code:

import * as fs from 'node:fs'
import * as http from 'node:http'
import * as path from 'node:path'
import * as dotenv from 'dotenv'
import express from 'express'

import api from './api/api'

dotenv.config({ path: path.resolve(path.join(__dirname, '../', '.env')) })
    
const config = {
    PORT: 8080
}

const app: express.Express = express()

app.use('*', (req, res, next) => {
    console.log(`Connection: ${req.socket.remoteAddress}:${req.socket.remotePort} [${req.originalUrl} - ${req.baseUrl} - ${req.url}]`)
    next()
})

app.use('/api/test', (req, res) => {
    res.send('Hello, test api')
})

app.use('/api', (req, res) => {
    res.send('Hello, API!')
})

app.get('/', (req, res) => {
    res.send('Hello World!')
})

app.listen(config.PORT, () => {
    console.log(`Listening on port ${config.PORT}`)
})

When connecting via domain.com/api:

When connecting via domain.com/api/test:

[IamLizu]

Perhaps its a more nginx problem, could you please try something like,

server {
    listen 80;
    server_name www.my.domain.name.com;

    location /api/ {
        proxy_pass http://localhost:8080/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    location / {
        # Your other settings for the main website
    }
}

[TracerDS]

I have nearly the exact same structure.

During writing of this comment, suddenly express and nginx started cooperating with each other. I guess its resolved.
Thanks for help ❤

[IamLizu]

Glad its solved🥳