API Request Tester
Test REST APIs with full HTTP method support, custom headers, and detailed response analysis
Request Configuration
Headers (JSON)
Response
Response will appear here...
Request History
No requests yet
Free Online API Testing Tool - Best Postman Alternative
A comprehensive API testing tool for developers and QA engineers. Test RESTful APIs with support for all HTTP methods, custom headers, and real-time response analysis. Perfect for API development, debugging, and integration testing. This browser-based API tester serves as a powerful, free Postman alternative with advanced features for modern web development.
Complete HTTP Methods Testing Support
GET Requests
Retrieve and fetch data from API endpoints with parameters
POST Requests
Create new data and resources with JSON body support
PUT Requests
Update existing data with full resource replacement
DELETE Requests
Remove data and resources from API endpoints
PATCH - Partial Updates
HEAD - Headers Only
OPTIONS - CORS Testing
Professional API Testing & Debugging Features
Real-Time Response Analysis
Instant API response validation with JSON formatting, response time tracking, and status code visualization
Custom Headers Configuration
Full JSON format support for headers, authentication tokens, content-type specification, and API-specific requirements
Request Body Builder
Advanced data manipulation tools for POST, PUT, PATCH requests with JSON validation and formatting
Performance Monitoring
Response time tracking for API performance analysis and bottleneck identification
Request History & Replay
Track testing progress with one-click replay functionality for efficient API debugging workflow
Advanced Error Handling
Detailed error feedback with status code indicators and comprehensive debugging information
Why Choose Our Online API Testing Tool?
Free Postman Alternative
No registration required, unlimited API testing, completely browser-based with enterprise-level features
Lightning Fast Testing
Instant API response validation, real-time JSON formatting, and immediate performance metrics
100% Secure & Private
All testing performed in your browser, no data stored on servers, safe for authenticated endpoints
REST API Testing Best Practices & Usage Guide
1Start with GET Request Testing
Begin API testing with simple GET requests to verify endpoint accessibility and response structure. This helps establish baseline connectivity before testing more complex operations.
2Validate POST & PUT Request Bodies
Ensure your request body follows the API's expected JSON format. Use the built-in JSON validator to check syntax and structure before sending requests.
3Configure Authentication Headers
Use custom headers for authorization tokens, API keys, and authentication. The tool supports all standard authentication methods including Bearer tokens and Basic Auth.
4Monitor API Performance
Use response time tracking to identify performance bottlenecks and optimize API calls. Track trends across multiple requests for comprehensive analysis.
5Test Error Scenarios
Modify request parameters to test various error conditions. Monitor status codes (400, 401, 404, 500) to ensure proper error handling in your applications.
6Utilize Request History
Leverage the history feature to track testing progress and quickly reproduce specific test scenarios. Save commonly used requests for efficient debugging workflow.
Enterprise-Grade API Testing Without the Cost
GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS support
Instant response validation and JSON formatting
No limitations, registration, or hidden costs
Perfect for Development Teams
Ideal for developers, QA engineers, and API integrators who need a reliable, feature-rich API testing tool. Works seamlessly with REST APIs, microservices, and web services across all development environments.
API Testing Guide
Supported Methods
- • GET - Retrieve data
- • POST - Create new data
- • PUT - Update existing data
- • DELETE - Remove data
- • PATCH - Partial updates
Headers
- • JSON format required
- • Common: Content-Type, Authorization
- • Custom headers supported
- • Automatically parsed
Features
- • Response time tracking
- • Status code indicators
- • JSON formatting
- • Request history