fetch-gremlin v1.0.5

Fetch Gremlin

A drop-in replacement for fetch that injects failure into your application.

Why inject failure into your application?

Because if your application is failing all of the time, you will be forced to write resilient code.

Usage

You normally use fetch like this:

const fetch = require('fetch-everywhere')
...
fetch('https://example.com/api/users/1').then(() => { ... })

Change your code to this:

const fetch = require('fetch-gremlin')()
...
fetch('https://example.com/api/users/1').then(() => { ... })

Probability of failure

There are two types of failure for which you can set the probability: immediately throwing an error or returning an Internal Server Error. The default for each type of failure is 0.2 (20%).

const fetch = require('fetch-gremlin')({
  throwError: 0.3, // 30% probability of an exception being thrown
  badResponse: 0.4 // 40% probability of a bad response
})
...
fetch('https://example.com/api/users/1').then(() => { ... })