circuit-breaker.js

// Require the library and client
const circuitBreaker = require("opossum")
const apiClient = require("our-example-api-client")
// Our example request
const getPosts = (req, res, next) => {
  // Wrap our client get method in the circuit breaker
  const breaker = circuitBreaker(apiClient.get, {
    timeout: 3000,
    errorThresholdPercentage: 50,
    resetTimeout: 5000
  })
  // Call the API from within the circuit breaker
  return breaker
    .fire("/api/posts")
    .then(res.json)
    .catch(next)
}