Tiny Online Tools
Understand ブラウザ, OS, and デバイス from User Agent Strings
When debugging client-side issues, analyzing user reports, or reviewing support tickets, you often get user agent strings—long, cryptic strings that contain inフォーマットion about the user's ブラウザ, operating system, デバイス, and engine. Parsing these strings manually is tedious and error-prone.
A user agent string like Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 contains valuable inフォーマットion, but you need to know how to interpret it. This User Agent Parser デコードs it instantly, extracting ブラウザ name, version, OS, and デバイス type.
What Gets Parsed
ブラウザ: Name and version of the ブラウザ (Chrome, Firefox, Safari, Edge, etc.)
Operating System: The OS being used (Windows, macOS, Linux, iOS, Android, etc.) and version if available
デバイス: Mobile phone, tablet, desktop, or other デバイス type
Engine: The rendering engine (WebKit, Gecko, Blink, etc.) and version
Why This Matters for Development
QA & Bug Reports: When a user reports "the site looks broken," you get their user agent string. Parsing it immediately tells you their ブラウザ and OS, helping you understand if it's a ブラウザ-specific issue or platform-specific problem.
Analytics & Statistics: Understand which ブラウザs, デバイスs, and OS versions your users are using. This data helps prioritize bug fixes and 機能.
Feature Support Testing: Different ブラウザs support different 機能. Knowing exactly which ブラウザ and version a user has helps you determine if a feature should work or if the user has an older ブラウザ.
Support & Troubleshooting: When supporting users, quickly identify their environment to suggest workarounds or upgrades if needed.
A/B Testing & Rollouts: Check if issues correlate with specific ブラウザs or platforms by parsing user agent data from error logs.
Common Developer Workflows
Support Ticket Analysis: User reports a problem in a ticket. Extract their user agent string from ブラウザ console logs or server logs, paste it here, and immediately see if they're on a mobile デバイス, older ブラウザ version, or unusual OS.
Error Log Investigation: Server logs contain user agent strings. Parse them quickly to understand what デバイスs and ブラウザs encountered errors, identifying patterns.
Analytics Debugging: Your analytics show traffic from an unfamiliar user agent. Parse it to understand what デバイス/ブラウザ it is.
QA Reporting: QA finds a bug and includes their user agent. Parse it to see the exact environment the bug occurred in.
Mobile vs. Desktop Issues: Quickly check if an issue is mobile-specific or desktop-specific by parsing the user agent string.
ブラウザ Version Testing: See what version a user has to determine if a bug is version-specific or ブラウザ-wide.
Real-World Example
Paste: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Mobile/15E148 Safari/604.1
Get: iOS 17.4 on iPhone, Safari 17.3.1
Instantly know it's a mobile issue on an Apple デバイス using Safari.
Copy Results
Parsed inフォーマットion displays in a clear table. Copy individual values or the entire result for documentation or ticketing systems.
100% Local Parsing
Parsing happens in your ブラウザ using pattern matching against known user agent フォーマットs. No server involved, no external API calls needed. Works instantly and privately.