html – Node js error Streaming Application in Node

node:internal/modules/cjs/loader:1228
throw err;
^

Error: Cannot find module ‘express’
Require stack:

    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Module._load (node:internal/modules/cjs/loader:1051:27)
    at Module.require (node:internal/modules/cjs/loader:1311:19)
    at require (node:internal/modules/helpers:179:18)
    at Object. (C:\Users\Khan\Documents\project 7\index.js:1:17)
    at Module._compile (node:internal/modules/cjs/loader:1469:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1548:10)
    at Module.load (node:internal/modules/cjs/loader:1288:32)
    at Module._load (node:internal/modules/cjs/loader:1104:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ 'C:\\Users\\Khan\\Documents\\project 7\\index.js' ]
}```

Node.js v20.17.0

I had run cd node index.js
but showing this error
but we want the it should be run on localhost:3000 server
video streaming server we were making