mochi.js

mochi.js is a Bun-native browser automation framework built on raw Chrome DevTools Protocol (CDP) that produces stealth sessions indistinguishable from real Chrome. It derives every fingerprint surface — canvas, WebGL, audio, fonts, MediaDevices, WebGPU — from a single (profile, seed) pair through a 48-rule DAG, ensuring relational consistency across all detection vectors. Released under the MIT license, it targets developers who need to automate Chromium without leaving measurable traces for anti-bot systems.

• Relational Consistency Engine — every fingerprint surface derives from a single (profile, seed) pair via a 48-rule DAG, eliminating mismatched "Frankenstein" fingerprints across canvas, WebGL, audio, fonts, and more.
• Chromium-native Fetch — session.fetch() routes through Chromium itself via CDP, so JA4/JA3/H2 signatures are real Chrome by definition — no parallel HTTP layer or FFI required.
• Behavioral Synthesis — humanClick, humanType, and humanScroll use biomechanical models (Bezier paths with overshoot/correction, Fitts-law timing, lognormal digraph delays) parameterized by hand, tremor, wpm, and scrollStyle profiles.
• Probe-Manifest Harness — captured baselines from real devices live in the repo; every PR diffs the live session's Probe Manifest against the baseline, with Zero-Diff enforced as a CI gate.
• Turnstile Challenge Handling — built-in autoClick for visible-checkbox Turnstile with an onEscalation callback for harder variants.
• Custom Init Scripts — inject JIT-friendly proxy traps before any page script runs via page.addInitScript(), removable at any time with page.removeInitScript().
• One Coherent Stack — replaces the typical hand-stitched pipeline (Patchright + fingerprint-injector + curl-impersonate) with a single library; Bun-only, no Node, no Python sidecars, no proprietary bits.
• Playwright-compatible API — familiar session.newPage(), page.goto(), and page.evaluate() muscle memory with none of the fingerprint leakage.

To get started, install with bun add @mochi.js/core, then call mochi.launch({ profile, seed }) to boot a stealth browser session in three lines.