SecretFinder: discover sensitive data in JavaScript files


SecretFinder is a python script based on LinkFinder (version for burpsuite here), written to discover sensitive data like apikeys, accesstoken, authorizations, jwt,..etc in JavaScript files. It does so by using a jsbeautifier for python in combination with a fairly large regular expression. The regular expressions consist of four small regular expressions. These are responsible for finding and search anything on js files.

The output is given in HTML or plaintext.


$ git clone secretfinder
$ cd secretfinder
$ python -m pip install -r requirements.txt or pip install -r requirements.txt

add Regex

  • Open and add your regex:
    _regex = {
    'google_api' : r'AIza[0-9A-Za-z-_]{35}',
    'google_captcha' : r'6L[0-9A-Za-z-_]{38}|^6[0-9a-zA-Z_-]{39}$',
    'google_oauth' : r'ya29\.[0-9A-Za-z\-_]+',
    'amazon_aws_access_key_id' : r'AKIA[0-9A-Z]{16}',
    'amazon_mws_auth_toke' : r'amzn\\.mws\\.[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}',
    'amazon_aws_url' : r's3\[/]+|[a-zA-Z0-9_-]*\.s3\',
    'facebook_access_token' : r'EAACEdEose0cBA[0-9A-Za-z]+',
    'authorization_basic' : r'basic\s*[a-zA-Z0-9=:_\+\/-]+',
    'authorization_bearer' : r'bearer\s*[a-zA-Z0-9_\-\.=:_\+\/]+',
    'authorization_api' : r'api[key|\s*]+[a-zA-Z0-9_\-]+',
    'mailgun_api_key' : r'key-[0-9a-zA-Z]{32}',
    'twilio_api_key' : r'SK[0-9a-fA-F]{32}',
    'twilio_account_sid' : r'AC[a-zA-Z0-9_\-]{32}',
    'twilio_app_sid' : r'AP[a-zA-Z0-9_\-]{32}',
    'paypal_braintree_access_token' : r'access_token\$production\$[0-9a-z]{16}\$[0-9a-f]{32}',
    'square_oauth_secret' : r'sq0csp-[ 0-9A-Za-z\-_]{43}|sq0[a-z]{3}-[0-9A-Za-z\-_]{22,43}',
    'square_access_token' : r'sqOatp-[0-9A-Za-z\-_]{22}|EAAA[a-zA-Z0-9]{60}',
    'stripe_standard_api' : r'sk_live_[0-9a-zA-Z]{24}',
    'stripe_restricted_api' : r'rk_live_[0-9a-zA-Z]{24}',
    'github_access_token' : r'[a-zA-Z0-9_-]*:[a-zA-Z0-9_\-]+@github\.com*',
    'rsa_private_key' : r'-----BEGIN RSA PRIVATE KEY-----',
    'ssh_dsa_private_key' : r'-----BEGIN DSA PRIVATE KEY-----',
    'ssh_dc_private_key' : r'-----BEGIN EC PRIVATE KEY-----',
    'pgp_private_block' : r'-----BEGIN PGP PRIVATE KEY BLOCK-----',
    'json_web_token' : r'ey[A-Za-z0-9-_=]+\.[A-Za-z0-9-_=]+\.?[A-Za-z0-9-_.+/=]*$',

    'name_for_my_regex' : r'my_regex',
    # for example
    'example_api_key' : r'^example\w+{10,50}'


usage: [-h] [-e] -i INPUT [-o OUTPUT] [-r REGEX] [-b]

[-p PROXY]

optional arguments:
-h, --help show this help message and exit
-e, --extract Extract all javascript links located in a page and
process it
-i INPUT, --input INPUT
Input a: URL, file or folder
-o OUTPUT, --output OUTPUT
Where to save the file, including file name. Default:
-r REGEX, --regex REGEX
RegEx for filtering purposes against found endpoint
(e.g: ^/api/)
-b, --burp Support burp exported file
-c COOKIE, --cookie COOKIE
Add cookies for authenticated JS files
-g IGNORE, --ignore IGNORE
Ignore js url, if it contain the provided string
-n ONLY, --only ONLY Process js url, if it contain the provided string
Set headers ("Name:Value\nName:Value")
-p PROXY, --proxy PROXY
Set proxy (host:port)
  • Most basic usage to find the sensitive data with default regex in an online JavaScript file and output the HTML results to results.html:

python3 -i -o results.html

  • CLI/STDOUT output (doesn’t use jsbeautifier, which makes it very fast):

python3 -i -o cli

  • Analyzing an entire domain and its JS files:

python3 -i -e

  • Ignore certain js file (like external libs) provided by -g –ignore

python3 -i -e -g ‘jquery;bootstrap;’

  • Process only certain js file provided by -n –only:

python3 -i -e -n ‘;’

  • Use your regex:

python3 -i -o cli -r ‘apikey=my.api.key[a-zA-Z]+’

  • Other options: add headers, proxy, and cookies:

python3 -i -e -o cli -c ‘mysessionid=111234’ -H ‘x-header:value1\nx-header2:value2’ -p -r ‘apikey=my.api.key[a-zA-Z]+’

  • The input accepts all these entries:
  • Url: e.g. [-e] is required
  • Js url: e.g.
  • Folder: e.g. myjsfiles/*
  • Local file: e.g /js/myjs/file.js

Copyright (C) 2020 m4ll0k