Loadmill
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  • Introduction
    • Loadmill - AI - Powered Solution
    • Deviceless mobile testing
      • Capturing traffic with Loadmill MITM Proxy
      • Loadmill desktop recorder
        • Generating test flows
      • Installing certificate on mobile devices
        • iOS certificate installation
        • Android certificate installation
      • Configuring proxy on mobile devices
        • iOS Wi-Fi settings
        • Android Wi-Fi settings
      • Troubleshooting
    • What is an API
      • API - Data Fetching
      • Quick examples of API requests
      • What is an API endpoint?
    • API Server Testing
      • Contract testing
      • Regression Testing
  • Quick Guide
    • Create Account
    • Download Test Composer
    • Register your first API flow
    • Running Your API Test
  • Loadmill Test Composer
    • Quickstart
    • Composer Layout
    • Filter Settings
  • Test Editor
    • Layout
    • Flows
      • Generated Flow Code
      • Test Flow editor
      • Flow Controls
      • Add CSV to Flow
      • Flow Execution
    • Steps
      • Request step
      • Code step
      • Extraction & Assertion step
      • Web Socket step
    • Extractions - Set Parameters
    • Assertions - Verify Response
    • Parameters
      • Parameter Execution Order
      • Test Suite Parameters
      • Parameters Sets
    • ⨍(⨯) FUNCTIONS
    • Postscript
      • Running Postscript
      • Accessing w/ Postscript
      • Validating Postscript
    • Login/Authentication Flow
    • Before & After Hooks
  • Load Testing
    • Load Test Editor
    • Load Testing Guide
    • Analyzing Load Test Results
    • Parameterized Load Test
    • Domain Verification
    • Configuration Files
    • Load Testing FAQs
    • Load Testing Troubleshooting
  • User Behavior Testing
    • Overview
    • Setup
    • Recording troubleshooting
    • Additional recording methods
    • Recording settings
    • How to work with Recordings
  • Auth
    • Okta SSO integration
    • API Tokens
    • Testing with CORS
    • REST API
  • Integrations
    • Loadmill Agent
    • CI integration
    • GitHub
      • CI integration
      • Data sync
    • GitLab
    • Bitbucket
    • Jira
    • New Relic
    • Slack integration
    • TestRail integration
    • Database Testing
    • Kafka Testing
    • Datadog Integration
    • ✉️Email Testing
    • Webhook Testing
    • Integrations FAQs
    • XRay
    • TestRail
    • gRPC Support
  • Collaboration
    • Collaboration
    • Teams
    • Groups & Reports
    • Test Suite Collaboration
    • Reviews
    • Shared Flows
    • Labels
  • Reporting
    • API Catalog & Coverage
      • API Catalog
        • Unique Entity ID's Mapping
        • Domain Mapping and grouping
        • Endpoints grouping
        • OpenAPI upload
      • Test Coverage
        • Generating API test coverage report
  • General
    • Billing
      • Usage report
    • Settings
      • 📈Analytics
        • Flow Run History
      • 🧳Import & Export
    • General FAQs
    • General troubleshooting
    • Comparisons
      • Loadmill vs. SoapUI
      • Loadmill vs. JMeter
      • Loadmill vs. Blazemeter
      • Loadmill vs. WebdriverIO
      • Loadmill vs. Potato
    • Miscellaneous
      • Running a Test Suite
      • Test Plan
      • API Testing troubleshooting
      • API Testing FAQs
      • Test Editor
        • API Tests - Data from CSV files
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  1. Introduction

What is an API

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Last updated 2 years ago

Application Programming Interfaces (APIs) have completely overtaken how we use mobile and web applications by allowing software to interact with other software. Today, we use APIs as a key entry point for any data, service, and integration access.

An API is an interface that allows two pieces of software to communicate with each other. It provides a way for one program to request data from another program, and for the other program to respond to that request.

An API can be thought of as a set of rules that govern how two pieces of software interact with each other. When one piece of software wants to request data from another piece of software, it does so by following the API's rules. The API then tells the second piece of software how to respond to the request.