JA4
JA4 is a method for fingerprinting clients by examining the structure and order of fields in TLS and HTTP headers, rather than relying solely on user agent strings. This approach helps distinguish between different clients, even if they use similar user agent strings, making it useful for bot detection, fraud prevention, and security analytics. JA4 fingerprints are more resilient to spoofing and provide deeper insights into client behavior.
What is JA4?
JA4 is a client fingerprinting technique that analyzes the structure and order of fields in TLS and HTTP headers. Unlike traditional methods that rely on user agent strings, JA4 examines how clients construct their requests, making it harder to spoof and more effective for identifying bots, malicious actors, and unique devices. It is widely used in security and fraud prevention.
