Table of Contents

Getting Started API Testing Guide Code Generation Example APIs Authentication Embedding Code Best Practices

Table of Contents

Getting Started API Testing Guide Code Generation Example APIs Authentication Embedding Code Best Practices

Getting Started

Welcome to PageEngineer API Playground! This comprehensive guide will help you master API testing and code generation.

Test APIs

Send HTTP requests with custom headers, body, and authentication

Generate Code

Get production-ready code snippets in 10+ languages

Share & Save

Save requests, create collections, and share with your team

API Testing Guide

Quick Start Tutorial

Enter API URL

Start by entering your API endpoint URL in the main input field

Select HTTP Method

Choose from GET, POST, PUT, PATCH, or DELETE methods

Configure Request

Add headers, request body, and authentication as needed

Send & Analyze

Click Send to execute the request and view the formatted response

Working with Headers

Headers provide additional information about your request. Common headers include:

Content-Type: application/json

Authorization: Bearer your-token-here

Accept: application/json

User-Agent: PageEngineer/1.0

Code Generation

Supported Languages & Frameworks

Frontend

React (Fetch)React (Axios)Vanilla JavaScriptNext.js (SSR)AngularVue.js

Backend

Python (Requests)Node.js (Axios)Java (OkHttp)C# (HttpClient)PHP (cURL)cURL

How to Use Generated Code

Installation

Install required dependencies for your chosen language:

npm install axios

pip install requests

composer require guzzlehttp/guzzle

Configuration

Remember to replace placeholder values:

• API keys and tokens
• Base URLs and endpoints
• Request parameters
• Error handling logic

Example APIs

Try these free APIs to get started with testing and code generation:

JSONPlaceholderFree

Free fake API for testing and prototyping

Visit API

Base URL:

https://jsonplaceholder.typicode.com

Popular Endpoints:

GET/postsGet all posts

GET/posts/1Get specific post

POST/postsCreate new post

PUT/posts/1Update post

DELETE/posts/1Delete post

Fake Store APIFree

Fake e-commerce REST API for testing

Visit API

Base URL:

https://fakestoreapi.com

Popular Endpoints:

GET/productsGet all products

GET/products/1Get specific product

GET/products/categoriesGet categories

GET/usersGet all users

POST/auth/loginUser login

ReqRes APIFree

Hosted REST-API for testing HTTP requests

Visit API

Base URL:

https://reqres.in/api

Popular Endpoints:

GET/usersList users

GET/users/2Single user

POST/usersCreate user

PUT/users/2Update user

DELETE/users/2Delete user

Authentication

Bearer Token

Most common for API authentication. Add to Authorization header:

Authorization: Bearer your-jwt-token-here

API Key

Simple key-based authentication. Can be in header or query parameter:

X-API-Key: your-api-key-here

Basic Auth

Username and password encoded in Base64:

Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=

OAuth 2.0

For complex authentication flows, obtain access token first:

Authorization: Bearer oauth-access-token

Embed API Code

Share Your API Requests

Embed PageEngineer API requests in your documentation, blog posts, or applications:

Embed Code:

Best Practices

API Testing Tips

• Start with GET requests to understand the API structure
• Always check response status codes and headers
• Test error scenarios (404, 500, etc.)
• Validate response data format and structure
• Use proper Content-Type headers for POST/PUT requests

Code Generation Tips

• Review generated code before using in production
• Add proper error handling for your use case
• Replace placeholder values with actual credentials
• Consider rate limiting and retry logic
• Test generated code in your development environment

Security Considerations

• Never expose API keys in client-side code
• Use environment variables for sensitive data
• Implement proper CORS policies
• Validate and sanitize all input data
• Use HTTPS for all API communications

Performance Optimization

• Implement request caching where appropriate
• Use pagination for large datasets
• Minimize payload size with field selection
• Implement connection pooling for high-volume APIs
• Monitor API response times and errors

Ready to Start Testing APIs?

Put your knowledge to practice with our powerful API playground

Open Playground Generate Code

Getting Started

Welcome to PageEngineer API Playground! This comprehensive guide will help you master API testing and code generation.

Test APIs

Send HTTP requests with custom headers, body, and authentication

Generate Code

Get production-ready code snippets in 10+ languages

Share & Save

Save requests, create collections, and share with your team

API Testing Guide

Quick Start Tutorial

Enter API URL

Start by entering your API endpoint URL in the main input field

Select HTTP Method

Choose from GET, POST, PUT, PATCH, or DELETE methods

Configure Request

Add headers, request body, and authentication as needed

Send & Analyze

Click Send to execute the request and view the formatted response

Working with Headers

Headers provide additional information about your request. Common headers include:

Content-Type: application/json

Authorization: Bearer your-token-here

Accept: application/json

User-Agent: PageEngineer/1.0

Code Generation

Supported Languages & Frameworks

Frontend

React (Fetch)React (Axios)Vanilla JavaScriptNext.js (SSR)AngularVue.js

Backend

Python (Requests)Node.js (Axios)Java (OkHttp)C# (HttpClient)PHP (cURL)cURL

How to Use Generated Code

Installation

Install required dependencies for your chosen language:

npm install axios

pip install requests

composer require guzzlehttp/guzzle

Configuration

Remember to replace placeholder values:

• API keys and tokens
• Base URLs and endpoints
• Request parameters
• Error handling logic

Example APIs

Try these free APIs to get started with testing and code generation:

JSONPlaceholderFree

Free fake API for testing and prototyping

Visit API

Base URL:

https://jsonplaceholder.typicode.com

Popular Endpoints:

GET/postsGet all posts

GET/posts/1Get specific post

POST/postsCreate new post

PUT/posts/1Update post

DELETE/posts/1Delete post

Fake Store APIFree

Fake e-commerce REST API for testing

Visit API

Base URL:

https://fakestoreapi.com

Popular Endpoints:

GET/productsGet all products

GET/products/1Get specific product

GET/products/categoriesGet categories

GET/usersGet all users

POST/auth/loginUser login

ReqRes APIFree

Hosted REST-API for testing HTTP requests

Visit API

Base URL:

https://reqres.in/api

Popular Endpoints:

GET/usersList users

GET/users/2Single user

POST/usersCreate user

PUT/users/2Update user

DELETE/users/2Delete user

Authentication

Bearer Token

Most common for API authentication. Add to Authorization header:

Authorization: Bearer your-jwt-token-here

API Key

Simple key-based authentication. Can be in header or query parameter:

X-API-Key: your-api-key-here

Basic Auth

Username and password encoded in Base64:

Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ=

OAuth 2.0

For complex authentication flows, obtain access token first:

Authorization: Bearer oauth-access-token

Embed API Code

Share Your API Requests

Embed PageEngineer API requests in your documentation, blog posts, or applications:

Embed Code:

Best Practices

API Testing Tips

• Start with GET requests to understand the API structure
• Always check response status codes and headers
• Test error scenarios (404, 500, etc.)
• Validate response data format and structure
• Use proper Content-Type headers for POST/PUT requests

Code Generation Tips

• Review generated code before using in production
• Add proper error handling for your use case
• Replace placeholder values with actual credentials
• Consider rate limiting and retry logic
• Test generated code in your development environment

Security Considerations

• Never expose API keys in client-side code
• Use environment variables for sensitive data
• Implement proper CORS policies
• Validate and sanitize all input data
• Use HTTPS for all API communications

Performance Optimization

• Implement request caching where appropriate
• Use pagination for large datasets
• Minimize payload size with field selection
• Implement connection pooling for high-volume APIs
• Monitor API response times and errors