jsfinder: scans web pages to find JavaScript files linked in the HTML source code

by do son · May 10, 2023

jsFinder

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.