API & Webhook Tester - Test Endpoints, Validate Responses, Measure Speed

Test any REST API endpoint or webhook URL. Send GET, POST, PUT, DELETE, or PATCH requests with custom headers and body. Validates status codes, response content, and JSON structure. Measures response time with performance grading.

What does API & Webhook Tester do?

It sends HTTP requests to your endpoints and returns detailed results: status code, response time, response body, headers, JSON validation, and custom checks. Supports retries with exponential backoff for flaky endpoints. Each endpoint gets a performance grade (A-F).

Key features:

• ✅ All HTTP methods: GET, POST, PUT, DELETE, PATCH, HEAD
• ✅ Custom headers and request body
• ✅ Status code validation and content checks
• ✅ JSON response parsing and validation
• ✅ Automatic retries with backoff
• ✅ Performance grading (A-F)

How much does it cost?

• Pricing: Pay per event — $1 per 100 endpoints tested
• Typical use: Testing 20 API endpoints ≈ $0.20

Input example

{
    "endpoints": [
        "https://jsonplaceholder.typicode.com/users",
        {
            "url": "https://httpstat.us/200",
            "method": "POST",
            "headers": { "Authorization": "Bearer test123" },
            "body": { "key": "value" },
            "expectedStatus": 200,
            "label": "Health Check"
        }
    ],
    "timeout": 10000,
    "retries": 2
}

Output example

{
    "url": "https://jsonplaceholder.typicode.com/users",
    "method": "GET",
    "statusCode": 200,
    "success": true,
    "responseTimeMs": 142,
    "performanceGrade": "A",
    "isJson": true,
    "jsonValid": true,
    "responseSizeBytes": 5645
}

Use cases

• API monitoring: Scheduled health checks for your endpoints
• Webhook verification: Confirm webhook URLs are receiving data correctly
• Load testing prep: Measure baseline response times before stress testing
• CI/CD integration: Smoke test APIs after deployment

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Built by Donny Dev