API Sniffer Pro
Popular Choice

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

Trusted by 100+ 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

1
Install API Sniffer Pro from the Chrome Web Store
2
Open Chrome DevTools and locate the API Sniffer Pro panel
3
Add/allow the domains you want to monitor
4
Reload your page and use your app normally
5
Inspect requests, responses, headers and payloads
6
Export 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 Coming Soon

We're crafting the perfect pricing plans to match your development workflow and team needs.

What to Expect

Flexible pricing tiers for individuals and teams
Feature-rich plans tailored to your workflow
Transparent pricing with no hidden fees
Enterprise solutions with custom configurations

In the meantime, enjoy full free access to all features as we finalize our pricing structure.

Join 100+ developers using API Sniffer Pro

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.