LoaderJsfinder – Fetches JavaScript Files

loaderjsfinder fetches JavaScript files quickly and comprehensively.

jsFinder is a command-line tool written in Go that scans web pages to find JavaScript files linked in the HTML source code. It searches for any attribute that can contain a JavaScript file (e.g., src, href, data-main, etc.) and extracts the URLs of the files to a text file. The tool is designed to be simple to use, and it supports reading URLs from a file or from standard input.

jsFinder is useful for web developers and security professionals who want to find and analyze the JavaScript files used by a web application. By analyzing the JavaScript files, it’s possible to understand the functionality of the application and detect any security vulnerabilities or sensitive information leakage.

Features

• Reading URLs from a file or from stdin using command line arguments.
• Running multiple HTTP GET requests concurrently to each URL.
• Limiting the concurrency of HTTP GET requests using a flag.
• Using a regular expression to search for JavaScript files in the response body of the HTTP GET requests.
• Writing the found JavaScript files to a file specified in the command line arguments or to a default file named “output.txt”.
• Printing informative messages to the console indicating the status of the program’s execution and the output file’s location.
• Allowing the program to run in verbose or silent mode using a flag.

Installation

jsfinder requires Go 1.20 to install successfully.Run the following command to get the repo :

go install -v github.com/kacakb/jsfinder@latest

Usage

To see which flags you can use with the tool, use the -h flag.

jsfinder -h 

Flag	Description
-l	Specifies the filename to read URLs from.
-c	Specifies the maximum number of concurrent requests to be made. The default value is 20.
-s	Runs the program in silent mode. If this flag is not set, the program runs in verbose mode.
-o	Specifies the filename to write found URLs to. The default filename is output.txt.
-read	Reads URLs from stdin instead of a file specified by the -l flag.

Demo

I

If you want to read from stdin and run the program in silent mode, use this command:

cat list.txt| jsfinder -read -s -o js.txt

II

If you want to read from a file, you should specify it with the -l flag and use this command:

jsfinder -l list.txt -s -o js.txt

You can also specify the concurrency with the -c flag.The default value is 20. If you want to read from a file, you should specify it with the -l flag and use this command:

jsfinder -l list.txt -c 50 -s -o js.txt

TODOs

• Adding new features
• Improving performance
• Adding a cookie flag
• Reading regex from a file
• Integrating the kacak tool (coming soon)

Screenshot

Contact

If you have any questions, feedback or collaboration suggestions related to this project, please feel free to contact me via:e-mail

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