connect-promiser v1.0.18

Connect Promiser

Connect Promiser is very simple middleware that lets you use promises to write your route handlers (and other middleware) without having to worry about explicity error handling. It mainly serves to stop you having to wrap every async function in a try/catch.

Usage

Setup

Connecting the middleware is easy, just app.use the require( "connect-promiser" ).

Using Promises

The middleware adds a function to res under res.promise. This function takes a next function and either a promise, or a () => promise.

If the promise is rejected, it is caught, and the error is passed to the next function as next(error)

Examples

Adding middleware

app.use( function( _req, res, next ) {
    res.promise( next, async function() {
        res.foobar = await doSomethingAsync();
        next();
    });
});

Sending a JSON response

app.use( function( req, res, next ) {
    res.promise( next, async function() {
        res.json( { result : await getSomethingAsync() } );
    });
});