如何在没有 package.json 文件的情况下运行 JavaScript 项目，从而在运行时出错？

Question

I am trying to run this project. It has no package.json file in it. Being an absolute noob with JS, with no JS experience whatsoever, I searched online how to run JS projects. Every link I found seems to assume that the file package.json is present. So, you typically do a "npm install" and then "npm start". But since there's no "package.json" file present in this project, running "npm install" doesn't do anything. But when I do "npm start", I get this error:

npm ERR! code ENOENT
npm ERR! syscall open
npm ERR! path /Users/username/Downloads/Face-Detection-JavaScript-master/package.json
npm ERR! errno -2
npm ERR! enoent ENOENT: no such file or directory, open '/Users/username/Downloads/Face-Detection-JavaScript-master/package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent 

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/username/.npm/_logs/2020-08-26T04_51_15_254Z-debug.log

So, how do I run this project?

I tried the solutions given here and here , but to no avail.

I also tried node script.js , but I get the following error:

const video = document.getElementById('video')
              ^

ReferenceError: document is not defined
    at Object.<anonymous> (/Users/username/Downloads/Face-Detection-JavaScript-master/script.js:1:15)
    at Module._compile (internal/modules/cjs/loader.js:1133:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
    at Module.load (internal/modules/cjs/loader.js:977:32)
    at Function.Module._load (internal/modules/cjs/loader.js:877:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
    at internal/main/run_main_module.js:18:47

When I open the index.html file in browser, I just get a blank page:

Answer 1

This doesn't have anything to do with Node.js. All you have to do is open the HTML file in your browser.

Answer 2

This is if you want to run javascript with node , for which you need to have node and npm installed, ( installation link here ), and initialize an node project with npm init --y to generate a package.json

But , in this case though, you just need to run the html file on your browser, and the javascript code will run on the browser, so you don't need to do all that.

Answer 3

Only nodeJS projects need package.json . You can run your javascript project by putting your index.html or main file directly on browser