mochi.js: A Bun-Native Browser Automation Tool with Relational Fingerprint Locking and CDP-Based Fetch

ccheshirecat

23d ago· 2 min readen

50/100

Doughy

Bagelometer↗

All dough, no crust. Filling but forgettable.

Score50Typepress releaseSentimentneutral

Summary

mochi.js is a Bun-native, raw-CDP browser automation tool that uses a relational consistency engine for fingerprint locking. It derives all fingerprint surfaces (canvas, WebGL, audio, fonts, MediaDevices, WebGPU) from a single (profile, seed) pair through a 48-rule DAG, preventing inconsistent fingerprints. It features Chromium-native fetch routing through CDP for JA4/JA3/H2 coherence, and behavioral synthesis for human-like interactions (click, type, scroll). The tool is designed for stealth browser automation with JIT-installed spoofing and no external dependencies.

Key quotes

· 5 pulled

Every fingerprint surface — canvas, WebGL, audio, fonts, MediaDevices, WebGPU — derives from a single (profile, seed) pair through a 48-rule DAG.

No Frankenstein fingerprints; a Mac UA never lands next to Linux WebGL.

session.fetch() routes through Chromium itself via CDP — Network.loadNetworkResource for simple GETs, page.evaluate('fetch') for non-GET.

JA4/JA3/H2 are real Chrome by definition. No parallel HTTP layer to keep in lockstep, no FFI to install.

Relational fingerprint locking, JIT-installed spoofing, JA4-coherent fetch. Leaves no crumbs.

Snippet from the RSS feed

Bun-native, raw-CDP browser automation. Relational fingerprint locking, JIT-installed spoofing, JA4-coherent fetch. Leaves no crumbs.

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