frankie@YilundeMacBook-Pro coding-104 % npm start

safety-code@1.0.0 start /Users/frankie/Desktop/coding-104
node server.js

internal/modules/cjs/loader.js:968
throw err;
^

Error: Cannot find module 'koa’
Require stack:

• /Users/frankie/Desktop/coding-104/server.js
  at Function.Module._resolveFilename (internal/modules/cjs/loader.js:965:15)
  at Function.Module._load (internal/modules/cjs/loader.js:841:27)
  at Module.require (internal/modules/cjs/loader.js:1025:19)
  at require (internal/modules/cjs/helpers.js:72:18)
  at Object. (/Users/frankie/Desktop/coding-104/server.js:1:13)
  at Module._compile (internal/modules/cjs/loader.js:1137:30)
  at Object.Module._extensions…js (internal/modules/cjs/loader.js:1157:10)
  at Module.load (internal/modules/cjs/loader.js:985:32)
  at Function.Module._load (internal/modules/cjs/loader.js:878:14)
  at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12) {
  code: ‘MODULE_NOT_FOUND’,
  requireStack: [ ‘/Users/frankie/Desktop/coding-104/server.js’ ]
  }
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! safety-code@1.0.0 start: node server.js
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the safety-code@1.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/frankie/.npm/_logs/2020-08-19T06_09_17_560Z-debug.log
frankie@YilundeMacBook-Pro coding-104 %