Server-Side Development with Hapi.js — Throw 400-Series Errors

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Hapi.js is a small Node framework for developing back end web apps.

In this article, we’ll look at how to create back end apps with Hapi.js.

Method Not Allowed Error

We can throw a method not allowed error with @hapi/boom ‘s methodNotAllowed method.

For instance, we can write:

const Hapi = require('@hapi/hapi');
const Boom = require('@hapi/boom');
const init = async () => {
  const server = new Hapi.Server({
    port: 3000,
    host: '0.0.0.0'
  });
  server.route({
    method: 'GET',
    path: '/',
    handler(request, h) {      
      throw Boom.methodNotAllowed('that method is not allowed');
    }
  });
  await server.start();
  console.log('Server running at:', server.info.uri);
};
process.on('unhandledRejection', (err) => {
  console.log(err);
  process.exit(1);
});
init();

Then we get:

{"statusCode":405,"error":"Method Not Allowed","message":"that method is not allowed"}

as the response.

We can set the Allow header with the 3rd argument.

To do this, we write:

const Hapi =…