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API Testing Tool

Test REST APIs, debug requests, and generate code snippets with this comprehensive API testing tool

Request Headers

Code Generation

Click any button above to generate code for your request in that language.

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Complete API Testing Tool Guide

Core Features Overview

HTTP Methods

GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS

Authentication

Basic Auth, Bearer Token, API Key

Environments

Multiple environments with variables

Code Generation

cURL, JavaScript, Python snippets

Getting Started

1. Basic API Request

Method: GET
URL: https://jsonplaceholder.typicode.com/posts/1
Headers: None required

2. POST Request with JSON Body

Method: POST
URL: https://jsonplaceholder.typicode.com/posts
Headers: Content-Type: application/json
Body: {"title": "New Post", "body": "Post content", "userId": 1}

Environment Variables

Manage multiple environments (dev, staging, prod) with variable substitution.

Setup Example:

Environment: Production
Variables:
  BASE_URL: https://api.example.com
  API_KEY: your-secret-key
  USER_ID: 12345

Usage in URL:

URL: {BASE_URL}/users/{USER_ID}/profile
Headers: Authorization: Bearer {API_KEY}

Authentication Methods

Basic Auth

Username: your-username
Password: your-password

Bearer Token

Token: Bearer your-jwt-token

API Key

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

Headers & Request Body

Common Headers

Content-Type: application/json
Accept: application/json
Authorization: Bearer token
User-Agent: API-Tester/1.0

JSON Body Examples

Create User:
{"name": "John Doe", "email": "john@example.com", "age": 30}
Update Profile:
{"bio": "Software Developer", "location": "San Francisco"}

Code Generation

Generated Code Examples

cURL:
curl -X POST https://api.example.com/users \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer token" \
  -d '{"name":"John","email":"john@example.com"}'
JavaScript (fetch):
const response = await fetch('https://api.example.com/users', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer token'
  },
  body: JSON.stringify({name: 'John', email: 'john@example.com'})
});
Python (requests):
import requests
headers = {'Content-Type': 'application/json', 'Authorization': 'Bearer token'}
data = {'name': 'John', 'email': 'john@example.com'}
response = requests.post('https://api.example.com/users', json=data, headers=headers)

Data Management

Import/Export

  • • Export requests as JSON files
  • • Import saved configurations
  • • Share requests with team members

History & Favorites

  • • Automatic request history
  • • Save favorite requests
  • • Quick access to recent requests

Advanced Examples

RESTful API Testing

GET /users - Get all users
GET /users/123 - Get specific user
POST /users - Create new user
PUT /users/123 - Update user
DELETE /users/123 - Delete user

Testing with Query Parameters

GET https://api.example.com/users?page=1&limit=10&sort=name&order=asc

File Upload

POST https://api.example.com/upload
Headers: Content-Type: multipart/form-data
Body: FormData with file and metadata

Tips & Best Practices

Security

  • • Never commit API keys to version control
  • • Use environment variables for secrets
  • • Validate all input data
  • • Use HTTPS for production APIs

Performance

  • • Monitor response times
  • • Set appropriate timeouts
  • • Use caching when possible
  • • Test with different data sizes

Common Issues & Solutions

CORS Errors

Enable CORS proxy or use browser extension

401 Unauthorized

Check authentication headers and token validity

400 Bad Request

Validate request body format and required fields