Shows how to configure and use friendly error pages using extension events in hapi within node.

hapi-friendly-error-pages.js

'use strict';
const Hapi = require('hapi');
const Boom = require('boom');
const server = new Hapi.Server();
server.connection({ port: 8000 });

// test by using this in browser:
// http://localhost:8000

server.register(require('vision'), () => {

  server.views({
    engines: { hbs: require('handlebars') },
    relativeTo: __dirname,
    path: 'views'
  });

  server.ext('onPreResponse', (request, response) => {
    let resp = request.response;
    if (!resp.isBoom) return response.continue();
  
    response.view('error', resp.output.payload)
      .code(resp.output.statusCode);
  });

  server.route({
	  method: 'GET',
	  path: '/',
	  config: {
		  handler: function(request, response) {
			response(Boom.notFound());
		  }
	  }
  });
  
  server.start(() => console.log(`Started at ${server.info.uri}`));
});