CORS

The cors feature in LightTs enables Cross-Origin Resource Sharing (CORS), letting your API handle requests from web clients across domains.

Add CORS Support

1. Run the Command

   lts add cors

2. Apply Middleware

   Use the generated middleware in index.ts.

Core

src/core/cors.core.ts

import { app } from '@/config';

const originsList = [app.url];

...

export function checkCorsOrigin(
    origin: string | undefined,
    callback: (error: any, state: boolean) => void
) {
    if (!origin) return callback(null, true); // for * origins

    const origins = Object.values(originsList);
    let result = origins.find((url) =>
        typeof url === 'string' ? extractHostname(url) == extractHostname(origin) : null
    );

    if (result || !origin) {
        callback(null, true);
    } else {
        callback(
            `The CORS policy for this site does not allow access from the specified Origin.(${origin})`,
            false
        );
    }
}

Usage

index.ts

...
import { corsMiddleware } from '@/core/cors.core';

...

// cors
app.use(
    cors({
        origin: checkCorsOrigin,
        credentials: true
    })
);

...

Notes

• Customize origin to restrict domains (e.g., ['http://example.com']).
• Adjust methods and allowedHeaders as needed.

See CORS in Action Try a CORS-enabled route example.