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docs/api.md

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+# API Documentation
+
+## Introduction
+This document provides detailed information on how to use and implement the APIs in the V8 engine.
+
+## Table of Contents
+1. [Sign Up](#sign-up)
+2. [Log In](#log-in)
+3. [API Sign Up](#api-sign-up)
+4. [API Log In](#api-log-in)
+
+## Sign Up (Recommended)
+- Description: This API allows users to sign up for a new account through the browser.
+- Usage: To use this API, follow the steps below:
+  1. Step 1: Redirect the user to the sign-up page using the `/signup` route.
+  2. Step 2: Fill in the required information and submit the form.
+  3. Step 3: A JSON response will be returned with the user's information.
+- Payload Example:
+  ```JSON
+  {
+    "status": "success",
+    "message": "User created successfully"
+  }
+  ```
+
+## API 2
+- Description: This API provides functionality for ABC operations.
+- Usage: To use this API, follow these steps:
+  1. Step 1: Import the API module using `require('api2')`.
+  2. Step 2: Call the `performABC()` function with the required parameters.
+- Example:
+  ```javascript
+  const api = require('api2');
+  
+  api.performABC(param1, param2);
+  ```
+
+## API 3
+- Description: This API offers advanced features for DEF operations.
+- Sub-APIs:
+  - Sub-API 3.1: Provides additional functionality for DEF operations.
+  - Sub-API 3.2: Implements advanced algorithms for DEF operations.
+
+### Sub-API 3.1
+- Description: This sub-API extends the functionality of API 3 for DEF operations.
+- Usage: To use this sub-API, follow these steps:
+  1. Step 1: Import the sub-API module using `require('api3/subapi1')`.
+  2. Step 2: Call the `performDEF()` function with the required parameters.
+- Example:
+  ```javascript
+  const subapi = require('api3/subapi1');
+  
+  subapi.performDEF(param1, param2);
+  ```
+
+### Sub-API 3.2
+- Description: This sub-API implements advanced algorithms for DEF operations.
+- Usage: To use this sub-API, follow these steps:
+  1. Step 1: Import the sub-API module using `require('api3/subapi2')`.
+  2. Step 2: Call the `performAdvancedDEF()` function with the required parameters.
+- Example:
+  ```javascript
+  const subapi = require('api3/subapi2');
+  
+  subapi.performAdvancedDEF(param1, param2);
+  ```
+
+## API 4
+- Description: This API provides utility functions for GHI operations.
+- Usage: To use this API, follow these steps:
+  1. Step 1: Import the API module using `require('api4')`.
+  2. Step 2: Call the desired utility functions provided by the API.
+- Example:
+  ```javascript
+  const api = require('api4');
+  
+  api.utilityFunction1();
+  api.utilityFunction2();
+  ```