api-delay

What?

• Deliberately cause a delayed http response in an express app.

Why?

• Simulate a slow api response to test front end handling.
• Throttle api access to abusers, non-premium users, etc.

How?

• Creates a function that can be used as app middleware or a route handler.
• Set the time and trigger options to customize the delayed call to next().

When?

• delayNext will always delay the call to next().
• delayNextIf will only delay the call to next() if Trigger returns a truthy value.

Installation

npm install api-delay

Testing

npm test

Usage

'use strict';

// create express app
const app = require('express')();

// get configurable middleware
const { delayNext, delayNextIf } = require('api-delay');

// will add a 200 millisecond delay in express request/response
const middleWareDelay = delayNext({ time: 200 });

// will add a 500 millisecond delay in express request/response if trigger function returns truthy
const conditionalMiddleWareDelay = delayNextIf({
  time: 500,
  trigger: receiver => {
    // if username is falsey, expression returns truthy to trigger delay
    return !receiver.req.body.username;
  }
});

// add as middleware to all routes
app.use(middleWareDelay);

// add as a handler to a specific route
app.all('/somepath', [conditionalMiddleWareDelay], (req, res) => {
  res.send('some_response');
});

See more usage in docs, examples, and tests