Your friendly side panel terminal! Learn how to diagnose DNS, SSL, and email infrastructure using simple, guided commands.
Users
9
−2 in 30 days
Rating
5.0 / 5
unchanged in 30 days
Ratings
1
0 in 30 days
Store rank
#201K
#168K among extensions
Version
3.2.1
updated 16 May 2026
Users
monthly, 6 months
Latest, 16 Oct 2026:9 usersMove the mouse over the chart for any month
Ratings count
monthly, 6 months
Latest, 16 Oct 2026:1 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About WhatHappened
WhatHappened is a terminal emulator that lives in your Chrome side-panel for web infrastructure auditing.
It provides a set of diagnostic tools for web developers and researchers to audit websites without leaving the active tab. All queries are executed locally, ensuring your diagnostic data remains private.
WHAT CAN YOU DO?
- Network Audits: Check DNS records (A, MX, TXT, CNAME) and verify DNSSEC.
- Security Checks: Inspect SSL/TLS certificates and security headers (CSP, HSTS, etc.).
- Stack Detection: Identify hosting providers and server-side technologies using live network data.
- Environment Testing: Simulate different network conditions using throttling and user-agent overrides.
CORE PRINCIPLES:
- Local Execution: No servers, no tracking. Everything runs in your browser.
- Open and Safe: Uses standard libraries like DOMPurify for sanitization. No hidden remote code.
- POSIX-style: Supports basic piping (e.g., dig | grep) for simple data filtering.
- Non-intrusive: Works from the Chrome Side Panel to keep your main window clear while you work.
KEY FEATURES:
- Commands: dig, host, map, ssl, headers-check, waf, cookies, vitals.
- Sudo Mode: A simulated privilege layer to prevent running high-impact tools by mistake.
- Guided Help: Every command includes technical context on what it does and when to use it.
NO DATA COLLECTION:
WhatHappened does not collect, store, or transmit any user data. It is a free tool for the developer community.