API monitoring correct and fast, 24x7

Downtime caused by API performance has serious and costly business impact. Use Checkly's powerful but easy to use API monitoring solution to check your mobile, web app or IoT API for performance, uptime, and accuracy.

Start for free Read the docs

api.check.tsnew ApiCheck('hello-api-1', {
  name: 'Hello API',
  activated: true,
  request: {
    method: 'GET',
    url: 'https://api.checklyhq.com/public-stats',
    assertions: [
      AssertionBuilder.statusCode().equals(200)
    ],
  }
})

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Test and Monitor with confidence

Monitor for Performance

Checkly records the response time for each request, down to TCP, DNS and first byte times. Add assertions for maximum response time.

Monitor for Correctness

Check payloads, return codes, headers, and authentication. Dive inside JSON payloads and validate specific items.

High-Frequency Global Monitoring

Monitor your APIs every 10 seconds from over 20 global data center locations.

Setup and Teardown Scripts

Run custom Javascript before and after your API check. Sign requests, get auth tokens and clean up test data.

Import from Tools You Know

Checkly’s cUrl and Swagger API importers create fully fledged API checks with just a couple of clicks.

CI/CD Integration

Integrate your API monitoring into your QA or continuous delivery process by triggering checks from the command line.

Code your API checks

Programmatically code your API monitors in TypeScript or JavaScript. Checkly gives you complete control over all HTTP request options: HTTP method, URL, query parameters, headers, and body. We monitor your APIs as often as every ten seconds.

import { ApiCheck, AssertionBuilder, Frequency } from "@checkly/cli/constructs";

new ApiCheck("public-stats-api", {
  name: "API: Public stats",
  alertChannels: [],
  degradedResponseTime: 10000,
  maxResponseTime: 20000,
  frequency: Frequency.EVERY_30S,
  request: {
    url: "https://api.checklyhq.com/public-stats",
    method: "GET",
    followRedirects: true,
    skipSSL: false,
  },
});

Add API Check Assertions

Monitor your APIs for correct response times, HTTP status codes, plain text or JSON bodies and headers. Drill into JSON payloads with JSON path or user regular expression.

import { ApiCheck, AssertionBuilder, Frequency } from "@checkly/cli/constructs";

new ApiCheck("public-stats-endpoint", {
  name: "API: Public stats",
  alertChannels: [],
  degradedResponseTime: 10000,
  maxResponseTime: 20000,
  frequency: Frequency.EVERY_30S,
  request: {
    url: "https://api.checklyhq.com/public-stats",
    method: "GET",
    followRedirects: true,
    skipSSL: false,
    assertions: [
      // add assertions against status codes, headers and response bodies
      AssertionBuilder.statusCode().equals(200),
      AssertionBuilder.jsonBody("$.apiCheckResults").greaterThan(5000_000_000),
    ],
  },
});

Customize Setup & Teardown

Take complete control of how your request executes. Use setup scripts to cryptographically sign requests, fetch OAuth tokens and update request attributes before any request is done. Use teardown scripts to clean up test data or scrub sensitive data from the response.

import { ApiCheck, AssertionBuilder, Frequency } from "@checkly/cli/constructs";
import * as path from "path";

new ApiCheck("public-stats-endpoint", {
  name: "API: Public stats",
  alertChannels: [],
  degradedResponseTime: 10000,
  maxResponseTime: 20000,
  frequency: Frequency.EVERY_30S,
  request: {
    url: "https://api.checklyhq.com/public-stats",
    method: "GET",
    followRedirects: true,
    skipSSL: false,
    assertions: [
      AssertionBuilder.statusCode().equals(200),
      AssertionBuilder.jsonBody("$.apiCheckResults").greaterThan(5000_000_000),
    ],
  },
  // define setup script
  setupScript: {
    entrypoint: path.join(__dirname, "setup.ts"),
  },
  // define teardown script
  tearDownScript: {
    entrypoint: path.join(__dirname, "teardown.ts"),
  },
});

Test your Future API monitoring

Test your defined API monitors locally or in your CI/CD development work flow to avoid misconfigured or broken monitoring resulting in unnecessary alert.

$ npx checkly test

Running 3 checks in eu-west-1.

src/api/__checks__/api.check.ts
   ✔ API: Public stats (65ms)
   ✔ API: Add to cart (369ms)
   ✔ API: Create order (561ms)

2 passed, 2 total

Deploy your Monitoring infrastructure

Deploy and update your API monitoring resources after successful production deployments.

$ npx checkly deploy --preview

Create: 
    ApiCheck: public-stats-api
    ApiCheck: add-to-card-api
    ApiCheck: create-order-api

$ npx checkly deploy --preview

? You are about to deploy your project "Monitoring as code" to account "Production". 
Do you want to continue? Yes

Successfully deployed project "Monitoring as code" to account "Production".