ederrafo / api-problem

HTTP Problem Utility

API Problem

RFC 7807 - Problem Details for HTTP APIs Utility

Install

npm install --only=production --save api-problem

API

Constructor: Problem(status[, title][, type][, members])

name	type	required	default	description	referece
status	String	✔	N/A	The HTTP status code generated by the origin server for this occurrence of the problem	Section 3.1
title	String	✖	HTTP status phrase	A short, human-readable summary of the problem type	Section 3.1
type	String	✖	about:blank	A URI reference that identifies the problem type	Section 3.1
details	Object	✖	N/A	additional details to attach to object	Section 3.1

import Problem from 'api-problem'

// HTTP defaults
new Problem(404)
//=> { status: '404', title: 'Not Found', type: 'http://www.iana.org/assignments/http-status-codes#404' }


// override defaults
new Problem(404, 'Oops! Page Not Found')
//=> { status: '404', title: 'Oops! Page Not Found', type: 'http://www.iana.org/assignments/http-status-codes#404' }


// custom values
new Problem(403, 'You do not have enough credit', 'https://example.com/probs/out-of-credit')
//=> { status: '403', title: 'You do not have enough credit', type: 'https://example.com/probs/out-of-credit' }


// additional details
new Problem(403, 'You do not have enough credit', 'https://example.com/probs/out-of-credit', {
  detail: 'Your current balance is 30, but that costs 50.',
  instance: '/account/12345/msgs/abc',
  balance: 30,
  accounts: ['/account/12345', '/account/67890']
})

//=> { status: '403', title: 'You do not have enough credit', type: 'https://example.com/probs/out-of-credit', detail: 'Your current balance is 30, but that costs 50.', instance: '/account/12345/msgs/abc', balance: 30, accounts: ['/account/12345', '/account/67890'] }


// HTTP defaults + Details
new Problem(403, {
  detail: 'Account suspended',
  instance: '/account/12345',
  date: '2016-01-15T06:47:01.175Z',
  account_id: '12345'
})
//=> { status: '403', title: 'Forbidden', type: 'http://www.iana.org/assignments/http-status-codes#404', detail: 'Account suspended', instance: '/account/12345', account_id: 12345, 'date: 2016-01-15T06:47:01.175Z' }

Method : toString()

returns a simplified, human-readable string representation

let prob = new Problem(403, 'You do not have enough credit', 'https://example.com/probs/out-of-credit')

prob.toString() //=> [403] You do not have enough credit ('https://example.com/probs/out-of-credit')

Method : send(response)

uses response.writeHead and response.end to send an appropriate error respnse message with the Content-Type response header to application/problem+json

import http from 'http'
import Problem from 'api-problem'

let response = new http.ServerResponse()
Problem.send(response)

Express Middleware

A standard connect middleware is provided. The middleware intercepts Problem objects thrown as exceptions and serializes them appropriately in the HTTP response while setting the Content-Type response header to application/problem+json

import express from 'express'
import Problem from 'api-problem'
import Middleware from 'api-problem/lib/middleware'

let app = express()

app.get('/', (req, res) => {
  throw new Problem(403)
})

app.use(Middleware)

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