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Fetches JavaScript files quickly and comprehensively from a defined list of URLs or domains.

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.

- 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.