我刚刚开始学习Node.js，并将其推送到Heroku。但是，即使我尝试删除并重新安装，问题仍然不断出现。谁能告诉我我程序中的问题是因为我一直在寻找答案，但找不到答案。
我的包裹
{
"name": "mailchimp-api",
"version": "1.0.0",
"description": "",
"main": "test_mail.js",
"scripts": {
"start": "node test_mail.js"
},
"author": "",
"license": "ISC",
"dependencies": {
"body-parser": "^1.19.0",
"express": "^4.17.1",
"nodemon": "^2.0.4"
}
}
2020-08-15T05:17:40.937553+00:00 app[api]: Set NODE_MODULES_CACHE config vars by user kevkwok0401@gmail.com
2020-08-15T05:17:40.937553+00:00 app[api]: Release v7 created by user kevkwok0401@gmail.com
2020-08-15T05:17:41.145484+00:00 heroku[web.1]: State changed from crashed to starting
2020-08-15T05:17:43.045731+00:00 heroku[web.1]: Starting process with command `npm start`
2020-08-15T05:17:45.501773+00:00 app[web.1]:
2020-08-15T05:17:45.501798+00:00 app[web.1]: > mailchimp-api@1.0.0 start /app
2020-08-15T05:17:45.501799+00:00 app[web.1]: > node test_mail.js
2020-08-15T05:17:45.501799+00:00 app[web.1]:
2020-08-15T05:17:45.690259+00:00 app[web.1]: internal/modules/cjs/loader.js:968
2020-08-15T05:17:45.690260+00:00 app[web.1]: throw err;
2020-08-15T05:17:45.690261+00:00 app[web.1]: ^
2020-08-15T05:17:45.690261+00:00 app[web.1]:
2020-08-15T05:17:45.690262+00:00 app[web.1]: Error: Cannot find module 'request'
2020-08-15T05:17:45.690262+00:00 app[web.1]: Require stack:
2020-08-15T05:17:45.690263+00:00 app[web.1]: - /app/test_mail.js
2020-08-15T05:17:45.690263+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:965:15)
2020-08-15T05:17:45.690264+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:841:27)
2020-08-15T05:17:45.690268+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:1025:19)
2020-08-15T05:17:45.690268+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:72:18)
2020-08-15T05:17:45.690269+00:00 app[web.1]: at Object.<anonymous> (/app/test_mail.js:3:17)
2020-08-15T05:17:45.690269+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:1137:30)
2020-08-15T05:17:45.690269+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
2020-08-15T05:17:45.690270+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:985:32)
2020-08-15T05:17:45.690270+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:878:14)
2020-08-15T05:17:45.690271+00:00 app[web.1]: at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12) {
2020-08-15T05:17:45.690271+00:00 app[web.1]: code: 'MODULE_NOT_FOUND',
2020-08-15T05:17:45.690271+00:00 app[web.1]: requireStack: [ '/app/test_mail.js' ]
2020-08-15T05:17:45.690272+00:00 app[web.1]: }
2020-08-15T05:17:45.700493+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2020-08-15T05:17:45.700865+00:00 app[web.1]: npm ERR! errno 1
2020-08-15T05:17:45.705245+00:00 app[web.1]: npm ERR! mailchimp-api@1.0.0 start: `node test_mail.js`
2020-08-15T05:17:45.705417+00:00 app[web.1]: npm ERR! Exit status 1
2020-08-15T05:17:45.705606+00:00 app[web.1]: npm ERR!
2020-08-15T05:17:45.705730+00:00 app[web.1]: npm ERR! Failed at the mailchimp-api@1.0.0 start script.
2020-08-15T05:17:45.705885+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2020-08-15T05:17:45.715163+00:00 app[web.1]:
2020-08-15T05:17:45.715315+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2020-08-15T05:17:45.715389+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2020-08-15T05_17_45_707Z-debug.log
2020-08-15T05:17:45.788233+00:00 heroku[web.1]: Process exited with status 1
2020-08-15T05:17:45.831930+00:00 heroku[web.1]: State changed from starting to crashed
2020-08-15T05:17:51.690184+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=enigmatic-stream-86051.herokuapp.com request_id=0cd0dcc0-e884-4704-aabf-dc8ad2089829 fwd="98.252.127.199" dyno= connect= service= status=503 bytes= protocol=https
编辑：需要安装npm安装请求。