Npm installed but server doesn't start

I try to run a simple JavaScript I can see the scripts below but I can't run the http-server one:

C:\Users\Thomas\source\repos\site-web2\site-web2>npm run

Scripts available in code@1.0.0 via `npm run-script`:

  dev
    http-server

  lint
    eslint *.js

When I try:

npm run http-server

I get:

npm ERR!
 Missing script: "http-server"
npm ERR!
npm ERR! To see a list of scripts, run:
npm ERR!   npm run

and if I try:

node http-server.js

node:internal/modules/cjs/loader:959
  throw err;
  ^

Error: Cannot find module 'C:\Users\Thomas\source\repos\site-web2\site-web2\http-server.js'
←[90m    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:956:15)←[39m
←[90m    at Function.Module._load (node:internal/modules/cjs/loader:804:27)←[39m
←[90m    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)←[39m
←[90m    at node:internal/main/run_main_module:17:47←[39m {
  code: ←[32m'MODULE_NOT_FOUND'←[39m,
  requireStack: []
}