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JA3 is officially dead. 2026 anti-bots use JA4, which inspects the specific byte-order of TLS 1.3 extensions, especially the "GREASE" and "Padding" values.
Implementation Steps:
Implementation Steps:
- Extension Reordering: Use a custom TLS library (like UTLS in Go or curl_cffi) to manually set the Extension order to match Chrome 145 exactly.
- Padding Manipulation: JA4 is sensitive to the total length of the
. You must calculate the exact padding needed so your request length matches a real browser (e.g., 512 or 1024 bytes).Code:ClientHello
- Validation: Check your signature against the JA4DB online to ensure you have a 99.9% "Human" score.









![[Image: kwi6yAD.gif]](https://i.imgur.com/kwi6yAD.gif)