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Fastify plugin that allows to add custom health checks in your server




Fastify Custom Healthcheck

js-semistandard-style Build Status

fastify-custom-healthcheck is a plugin for creating a health route with custom evaluations.


npm i fastify-custom-healthcheck


Require the module and just register it as any other fastify plugin. From fastify-custom-healthcheck on decorator is going to be added to your server for adding custom health checks.

const fastify = require('fastify')();
const customHealthCheck = require('fastify-custom-healthCheck');

fastify.register(customHealthCheck, options).then(() => {
    fastify.addHealthCheck('metric', () => {
        return new Promise((resolve) => setTimeout(resolve, 5000));



register plugin

fastify.register(customHealthCheck, {
    path: '/health/check', // default health
    info: {}, // custom information object

register options

  • path: path where you can reach health check route.
    • default value: '/health'.
  • info: object where you can define custom information you would like to include in healthcheck response object.
  • exposeFailure: Flag that enables additional information to be presented in health check object when a check fails.
    • default value: false


After registering plugin you can use the decorator for adding custom health checks.

fastify.addCustomHealthCheck(label, () => {}, { value: true });

decorator options

  • value: If you add on addHealthCheck a value, when computing health check an equality check happens between evaluation and the value returned by the health check function. If the values are different health check fails.

Example response

  "healthChecks": {
    "mongo": {
      "status": "FAIL",
      "reason": "MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED\n    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1144:16) {\n  name: 'MongoNetworkError'\n}]"
    "kafka": "HEALTHY",
    "redis": "HEALTHY" 
  "stats": {
    "creationTime": "2020-08-04T19:16:29.766Z",
    "uptime": 0.303361107,
    "memory": {
      "rss": 50102272,
      "heapTotal": 29270016,
      "heapUsed": 16499104,
      "external": 20754444,
      "arrayBuffers": 19273278
  "info": {
    "example": "Response",


This module is inspired by server-health and the need of having this functionality in fastify.



You can also check an example usage.


For any issues.


MIT License