express-with-json

Add functions which return objects as middlewares to express.

Avoid calling res.json() catching errors and calling next in every json-returning middleware. Instead, why not just:

• returning the object you want JSON-ed to the client or
• throwing JsonErrorResponse to return JSON-ed error to the client or
• throwing any other error to have next() called with it

Installation:

npm install express-with-json

Usage example:

import express from 'express';
import bodyParser from 'body-parser';
import fetch from 'node-fetch';
import withJson, { JsonErrorResponse } from 'express-with-json';

const app = withJson(express());
// app is a regular express instance just with a few extra methods

app.use(bodyParser.json());

app.get('/', (req, res) => res.send('Hello World!'));

app.getJson('/ok', () => {
  return { ok: true };
});
app.getJson('/fail', () => {
  throw new JsonErrorResponse({ ok: false }, { statusCode: 501 });
});
app.getJson('/fail2', () => {
  throw new Error('This error will cause next to be called');
});
app.postJson('/echo', (req, res) => {
  return req.body;
});
app.getJson('/async-demo', async () => {
  const response = await fetch('https://api.github.com/repos/ikatun/express-with-json');
  return await response.json();
});

const port = 3000;
app.listen(port, () => console.log(`Example app listening on port ${port}!`));