API Sniffer Pro

Capture, analyze, and debug API requests in real-time. The essential tool for developers and testers.

Trusted by 55+ active users worldwide

Used daily by developers and QA teams to capture real requests, verify responses, and ship fixes faster.

How API Sniffer Pro Works

API Sniffer Pro captures network activity in your browser and presents it inside a developer-friendly panel so you can debug faster.

What it measures

API Sniffer Pro observes API calls triggered by your app and organizes them by tab and time.

HTTP requests (fetch / XHR)
Request headers and payloads
Response status and body (when available)
Optional WebSocket monitoring (PRO)
Search and filters to find issues fast

How to use

1Install API Sniffer Pro from the Chrome Web Store
2Open Chrome DevTools and locate the API Sniffer Pro panel
3Add/allow the domains you want to monitor
4Reload your page and use your app normally
5Inspect requests, responses, headers and payloads
6Export logs when you need to share or reproduce issues
Read the Privacy Policy

Notes / limitations

Some browser/system pages (e.g., chrome://) cannot be monitored.
Captured data depends on the permissions and domains you explicitly allow.
If a response is streamed, encrypted, or blocked by the browser, the response body may be unavailable.
Always avoid capturing or storing sensitive production secrets in logs.

Who Uses API Sniffer Pro?

From debugging to security testing, API Sniffer Pro serves diverse use cases across the development lifecycle.

Frontend Developers

Debug API integrations in real-time while building React, Vue, or Angular applications. Instantly see what data your components are receiving.

QA Engineers

Validate API responses, test edge cases, and document bugs with complete request/response logs. Export evidence for bug reports.

Backend Developers

Monitor how your APIs are being consumed. Identify performance bottlenecks and optimize response times based on real usage patterns.

Security Analysts

Inspect authentication flows, detect unauthorized API calls, and ensure sensitive data is properly encrypted in transit.

API Integration Teams

Understand third-party APIs faster. Capture live examples of requests and responses to accelerate integration development.

Product Managers

Gain visibility into how your product communicates with backend services. Make data-driven decisions about feature development.

Pricing

Simple, transparent plans to fit your workflow.

Enjoy full free access until April 1, 2026. Purchasing will be enabled after this date.

Free

FREE

$0forever

Perfect for individual developers getting started

200 API Logs
Basic API Capture
View Request/Response
Basic Filtering
Single Device
Community Support

Monthly

$2per month

Flexible plan for professionals

All PRO features
Unlimited API sniffing
Export to Postman
WebSocket monitoring
Priority support
Cancel anytime
Best Value

Yearly

$20per year

Best value for committed users

All PRO features
Unlimited API sniffing
Export to Postman
WebSocket monitoring
Priority support
2 months free vs monthly
Limited

3 Years

$50three years

Only current features • Limited number of users

All current PRO features
Unlimited API sniffing
Export to Postman
WebSocket monitoring
Priority support

All paid plans include a 14-day money-back guarantee. No questions asked.

Why Choose API Sniffer Pro?

Lightweight & Fast

Minimal performance impact on your browser

Real-time Capture

See API calls as they happen, instantly

Export & Share

Export logs for debugging and collaboration

Ready to Supercharge Your API Debugging?

Join thousands of developers who trust API Sniffer Pro for their daily debugging needs.