routers

A group of router helpers for server-side use

Installation

$ npm install --save routers

Included Router Helpers

apiResolver(handlerRootPathname, { dataType = 'json' })

Composes promisedResolver and handlerResolver with a response formatter based on dataType.

The resolver will also have a method named errorHandler that you can use to handle middleware errors in a standard way (uses the error resolution and data formatter from the resolver).

import express from 'express';
import { apiResolver } from 'routers';
 
const app = express();
const resolve = apiResolver('routes');
 
// resolve to module at routes/users, method index
app.get('/users', resolve('users#index'));
app.get('/users/:id', resolve('users#get'));
 
app.use(resolve.errorHandler);

Your routes/users.js file might look like:

function index() {
  return Users.array();
}
 
function get({ params: { id } }) {
  return Users.where({ id }).first();
}
 
export { index, get };

classApiResolver(handlerRootPathname, { dataType = 'json' })

A specialized version of apiResolver (and is used the same way) that expects a class to be exported from the resolved module. It will instantiate this class once and then each request will call the appropriate method on that class.

This is very useful when you want to use decorators, which are not available on first-class functions.

import express from 'express';
import { classApiResolver } from 'routers';
 
const app = express();
const resolve = classApiResolver('routes');
 
// resolve to module at routes/users, method index
app.get('/users', resolve('users#index'));
app.get('/users/:id', resolve('users#get'));
 
app.use(resolve.errorHandler);

Your routes/users.js file might look like:

import { propTypes, strip } from './magical-decorators';
 
class UsersRoute {
  constructor() {
    // run only once
    // will run when the first route that resolves to this module (lazy instantiation)
  }
 
  @strip('password')
  index() {
    return Users.array();
  }
 
  @propTypes({
    params: { id: '!string' }
  })
  @strip('password')
  get({ params: { id } }) {
    return Users.where({ id }).first();
  }
};
 
export default UsersRoute;

handlerResolver(handlerRootPathname)

Maps a root path and string to file and method.

import express from 'express';
import { handlerResolver } from 'routers';
 
const app = express();
const resolve = handlerResolver('routes');
 
// resolve to module at routes/users, method index
app.get('/users', resolve('users#index'));

promisedResolver(resolver, handleResponse, handleError)

Adapts another resolver to handle promises.

import express from 'express';
import { promisedResolver } from 'routers';
 
const app = express();
const resolve = promisedResolver(
  handlerResolver('routes'),
  (data, res, next) => res.send(data),
  (err, res, next) => res.statusCode(err.statusCode).send(err.stack)
);
 
// resolve to module at routes/users, method index
app.get('/users', resolve('users#index'));

If the handler is of the form function(req), the return value will be interpreted as a promise. Otherwise the handler acts as any normal request handler (you write to res and then call next).

guard(app, middleware, fn)

Adds a middleware to every route added inside fn.

import express from 'express';
import { guard } from 'routers';
 
const app = express();
 
guard(app, authMiddleware, (app) => {
  app.get('/users', loggedInUsers.index);
});