build_fingerprint_js (fingerprint_builder)

pydoll · fingerprint-spoofing, js-injection, stealth-scripts, anti-detection, scraping

Assembles a complete JavaScript injection script that overrides browser fingerprint surfaces CDP cannot control, using a shared native-toString hook and per-section builders.

# Source: https://github.com/autoscrape-labs/pydoll | License: MIT | Copyright 2025 AutoscrapeLabs
# Provided via justclaw.it.com; keep this notice with the code.
def build_fingerprint_js(
    config: FingerprintConfig, user_agent: str = '', platform: str = ''
) -> str:
    """Build the complete page fingerprint injection script.

    Returns a single JS string that installs the shared native-toString hook
    and overrides every configured fingerprint surface CDP cannot handle.
    Empty string if nothing to inject.

    Args:
        config: Fingerprint configuration.
        user_agent: Reduced User-Agent string to expose as ``navigator.userAgent``
            in every realm (including detached iframes). Empty string skips it.
        platform: ``navigator.platform`` value to expose in 

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