Nest: CORS Demo?

Created on 23 Sep 2017 · 11Comments · Source: nestjs/nest

type question 🙌

Source

Feng-JY

Most helpful comment

You could also just in main.ts

```typescript
import { NestFactory } from '@nestjs/core';
import { ApplicationModule } from './app.module';
import * as cors from 'cors';

async function bootstrap() {
const app = await NestFactory.create(ApplicationModule);
app.use(cors());
await app.listen(5000);
}
bootstrap();

cschroeter on 13 Feb 2018

🎉12 ❤2

All 11 comments

Not active. use v4
Middleware ->

ApplicationModule ->

Feng-JY on 23 Sep 2017

👍1

Hey @Feng-JY,
As far as I know, everything is working correctly (the middlewares are applied). By the way, you can use https://github.com/expressjs/cors (cors package) and then just call app.use(cors()).

kamilmysliwiec on 23 Sep 2017

@kamilmysliwiec 100% works I'm using it in my project
https://github.com/illuminism/platform/blob/master/server/src/index.ts#L35

However, I think @Feng-JY wants to make it a middleware so he can scope a certain module and associated route(r/s) of the application. The way I did it, cors are open to all routes of the entire application, which isn't very robust.

matthewharwood on 23 Sep 2017

❤1

@Feng-JY how about something more complex, like this:

```typescript
import { Middleware, NestMiddleware, ExpressMiddleware } from '@nestjs/common';
import * as cors from 'cors'

@Middleware()
export class CorsMiddleware implements NestMiddleware {
resolve(...args: any[]): ExpressMiddleware {
return (req, res, next) => {
cors({}, req, res, next);
};
}
}```

cojack on 25 Sep 2017

❤5

Furthermore, I think functional middleware fits better here.

kamilmysliwiec on 25 Sep 2017

Hi @Feng-JY,
Are you still having some troubles with this middleware?

kamilmysliwiec on 1 Oct 2017

Hi!

I just to use the @matthewharwood link to use cors() and it works!.

Although, would be interesting a little reference in the documentation to "https://github.com/expressjs/cors" ;-)

Thanks.

Caballerog on 3 Oct 2017

👍5

You could also just in main.ts

```typescript
import { NestFactory } from '@nestjs/core';
import { ApplicationModule } from './app.module';
import * as cors from 'cors';

async function bootstrap() {
const app = await NestFactory.create(ApplicationModule);
app.use(cors());
await app.listen(5000);
}
bootstrap();

cschroeter on 13 Feb 2018

🎉12 ❤2

@cojack although it seems very nice and clean, it does not work for me. Function cors is never called.
Try this:

import { Middleware, NestMiddleware, ExpressMiddleware } from '@nestjs/common';
import * as cors from 'cors';

@Middleware()
export class CorsMiddleware implements NestMiddleware {
    resolve(...args: any[]): ExpressMiddleware {
        return cors();
    }
}

You can pass options as a first argument of cors().