# User-agent parser

Read the browser, operating system, engine and device type from a user-agent string.

## How it works

Browsers describe themselves in the User-Agent header. The order and wording are messy, so each browser is matched by its own pattern.

## Questions

### Why does Chrome say Safari?

For compatibility, most browsers include other browsers’ names. The specific tokens tell them apart.

### Is this reliable?

It’s good for analytics, not for security decisions: any client can send any user-agent.

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