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JavaScript Extraction CLI & Package

This is a powerful tool for extracting JavaScript sources from URLs and web pages / HTTP responses. It offers a command-line interface (CLI) for straightforward URL processing and a package interface for custom integrations, making it ideal for pentesters, bug bounty hunters, and developers needing to extract JS sources efficiently.

Table of Contents

Installation

To install getJS, use the following command:

go install github.com/003random/getJS/v2@latest

CLI Usage

Options

getJS provides several command-line options to customize its behavior:

  • -url string: The URL from which JavaScript sources should be extracted.
  • -input string: Optional URLs input files. Each URL should be on a new line in plain text format. Can be used multiple times.
  • -output string: Optional output file where results are written to. Can be used multiple times.
  • -complete: Complete/Autofill relative URLs by adding the current origin.
  • -resolve: Resolve the JavaScript files. Can only be used in combination with --complete.
  • -threads int: The number of processing threads to spawn (default: 2).
  • -verbose: Print verbose runtime information and errors.
  • -method string: The request method used to fetch remote contents (default: "GET").
  • -header string: Optional request headers to add to the requests. Can be used multiple times.
  • -timeout duration: The request timeout while fetching remote contents (default: 5s).

Examples

Extracting JavaScript from a Single URL

getJS -url https://destroy.ai

or

curl https://destroy.ai | getJS

Using Custom Request Options

getJS -url "http://example.com" -header "User-Agent: foo bar" -method POST --timeout=15s

Processing Multiple URLs from a File

getJS -input foo.txt -input bar.txt

Saving Results to an Output File

getJS -url "http://example.com" -output results.txt

Package Usage

Importing the Extractor

To use getJS as a package, you need to import the extractor package and utilize its functions directly.

Example

package main

import (
    "fmt"
    "log"
    "net/http"
    "net/url"

    "github.com/003random/getJS/extractor"
)

func main() {
    baseURL, err := url.Parse("https://google.com")
    if (err != nil) {
        log.Fatalf("Error parsing base URL: %v", err)
    }

    resp, err := extractor.FetchResponse(baseURL.String(), "GET", http.Header{})
    if (err != nil) {
        log.Fatalf("Error fetching response: %v", err)
    }
    defer resp.Body.Close()

    // Custom extraction points (optional).
    extractionPoints := map[string][]string{
        "script": {"src", "data-src"},
        "a": {"href"},
    }

    sources, err := extractor.ExtractSources(resp.Body, extractionPoints)
    if (err != nil) {
        log.Fatalf("Error extracting sources: %v", err)
    }

    // Filtering and extending extracted sources.
    filtered, err := extractor.Filter(sources, extractor.WithComplete(baseURL), extractor.WithResolve())
    if (err != nil) {
        log.Fatalf("Error filtering sources: %v", err)
    }

    for source := range filtered {
        fmt.Println(source.String())
    }
}

Version Information

This is the v2 version of getJS. The original version can be found under the tag v1.

Contributing

Contributions are welcome! Please open an issue or submit a pull request for any bugs, feature requests, or improvements.

License

This project is licensed under the MIT License. See the LICENSE file for details.