Hey there! We've found the following might help you get unblocked faster:

• 🧵 Cannot post on [station.railway.com](station.railway.com) - CORS Error

• 🧵 502 Error

• 🧵 CORS Errors on Express API Deployed to Railway

If you find the answer from one of these, please let us know by solving the thread!

Solution

Ensure you place the app.use(cors(...)) call before you define any routes in your Express application. The CORS middleware needs to handle the preflight OPTIONS request before it reaches your route handlers.

const express = require('express');

const cors = require('cors');

const app = express();

// --- CORS Configuration ---

// THIS MUST COME BEFORE YOUR ROUTES

const allowedOrigins = [

'http://localhost:5173',

'https://parky.in',

'https://www.parky.in'

];

const corsOptions = {

origin: function (origin, callback) {

// allow requests with no origin (like mobile apps or curl requests)

if (!origin || allowedOrigins.includes(origin)) {

callback(null, true);

} else {

callback(new Error('Not allowed by CORS'));

}

},

credentials: true,

};

app.use(cors(corsOptions));

// It's also good practice to enable pre-flight requests for all routes

app.options('*', cors(corsOptions));

// --- Other Middleware ---

app.use(express.json());

// etc.

// --- YOUR API ROUTES ---

// e.g., app.use('/api/auth', authRoutes);

// e.g., app.post('/api/auth/login', ...);

app.get('/', (req, res) => {

res.send('API is running...');

});

// ... rest of your server setup

const PORT = process.env.PORT || 8080;

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

Hi, I made the changes as per your suggestion. Code is working fine in local. But getting the same CORS blocked error. I tried ChatGPT and Claude and code seems to be right. Probably issue with Railway side. Please check as a priority, this has been over 3 days.

Can you just try simple

Allow all origins

app.use(cors())

Then deploy to railway and then see if you are getting the error.