guisehn/express-delay-header

Simulates latency on express requests when header is provided

express-delay-header

Use case

You want to test your fancy ajax loaders, spinners and stuff, but your dev machine is too damn fast for that shit!

-- boo1ean - creator of express-delay

I couldn't come with a better description than this. This library has the same goal with a few improvements:

• It allows you to control whether or not the delay should be present from the client by passing a Delay header with the desired latency.
• It'll only kick in when NODE_ENV is development, so you can safely commit the code to production and have the delay code running only on your local environment.

Installation

npm install express-delay-header --save

Usage

const app = require('express')()
const delay = require('express-delay-header')

app.use(delay())

// ...

Important: make sure the NODE_ENV environment variable is development for it to work.

On your client, pass a Delay header in the request with the desired delay in miliseconds (e.g. 3000 for 3 seconds).

curl --request GET \
  --url http://localhost:3000/ \
  --header 'delay: 3000'