What is this tool
The User Agent Parser is an online analysis tool for front-end developers, operators, data analysts and crawler developers. User-Agent (UA) is a key field in HTTP request headers. Clients carry device model, operating system, browser name, version and terminal type via UA. Servers and websites use UA to distinguish PC, mobile, tablet and mini-program visitors for page adaptation, traffic statistics and access control. This tool parses complete UA strings with one click, and displays detailed information including browser, OS, device type, version and rendering engine. It supports ultra-long and complex UA content, and can also generate simulated UA for specific terminals. It runs directly in browsers with no configuration required.
Use Cases
- 1.Front-end Adaptation：Distinguish terminals via parsed data and develop differentiated layouts for PC and mobile pages.
- 2.Traffic Analysis：Analyze UA in logs to count browsers, devices and systems of visitors and build user profiles.
- 3.Crawler Debugging：Generate simulated UA to disguise client requests for crawler testing.
- 4.Access Control：Identify abnormal UA and illegal clients to implement access interception and security protection.
- 5.Compatibility Troubleshooting：Locate the scope of faulty terminals for browser compatibility issues.
Why does this tool exist
A complete User-Agent is a long spliced string with complex structure. It is nearly impossible to extract valid information by naked eyes. Manual analysis is time-consuming and error-prone. Traditional methods require writing dedicated code or local scripts, which are complicated for temporary use and inaccessible for non-technical users. Browsers and devices from different manufacturers have different UA rules. Self-written parsing logic often has compatibility defects and causes recognition errors. This online tool has a complete rule library compatible with mainstream browsers and devices. It parses UA automatically and displays all information visually. The UA generation function meets simulation needs. It gets rid of code dependence, lowers the threshold of UA analysis, and improves efficiency in front-end development, log analysis and security work.