Node.js 使用前未加载带有ExpressJS服务器环境变量的NextJS_Node.js_Express_Environment Variables_Next.js

Node.js 使用前未加载带有ExpressJS服务器环境变量的NextJS

node.js express next.js

Node.js 使用前未加载带有ExpressJS服务器环境变量的NextJS,node.js,express,environment-variables,next.js,Node.js,Express,Environment Variables,Next.js,我有一个带有ExpressJS服务器的NextJS应用程序，用于处理应用程序的某些部分，以进行身份验证。在我尝试使用Sequelize ORM为数据库配置使用env变量之前，应用程序运行没有问题。起初我认为这可能是由于NextJS和ExpressJS同时运行造成的细微差别，但在代码中的不同点进行控制台日志记录之后，我的Sequelize DB config文件似乎正在运行，并在NextJS/ExpressJS从文件中加载环境变量之前设置了环境变量有人能提供背景说明为什么会这样吗 config/

我有一个带有ExpressJS服务器的NextJS应用程序，用于处理应用程序的某些部分，以进行身份验证。在我尝试使用Sequelize ORM为数据库配置使用env变量之前，应用程序运行没有问题。起初我认为这可能是由于NextJS和ExpressJS同时运行造成的细微差别，但在代码中的不同点进行控制台日志记录之后，我的Sequelize DB config文件似乎正在运行，并在NextJS/ExpressJS从文件中加载环境变量之前设置了环境变量

有人能提供背景说明为什么会这样吗

config/sequelize.js
MyDB配置文件：

console.log("Loading config file")
console.log(process.env.DB_DATABASE) // Returns undefined

module.exports = {
  "development": {
    "username": "username",
    "password": "password",
    "database": process.env.DB_DATABASE, // undefined
    "dialect": "postgres"
  },
}

console.log('server.js - file read')
console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns undefined

const express = require('express')
const next = require('next')

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()
    
app.prepare()
.then(() => {
    const server = express()

    console.log('app.prepare() triggered. Express server configuration started below')
    console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!

    //  Setting proxy for session handlng that is required for non-dev servers
    if (!dev){
        server.set('trust poxy', 1)
    }

    //  ExpressJS Routes
    server.use(routes);

    //  Mount the router on the app 
    //  Any routes that aren't handled by ExpressJS are handled by NextJS
    server.get('*', (req, res) => {
        return handle(req, res)
    })

    server.listen(3000, (err) => {
        if (err) throw err
        console.log('> Ready on http://localhost:3000')
        console.log('Expressjs server listening')
        console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!
    })
})
.catch((ex) => {
    console.error(ex.stack)
    process.exit(1)
})

npm run dev

> next-js-boilerplate@0.1.0 dev /Users/user/dev/nextjs/auth-boilerplate
> nodemon server.js

[nodemon] 2.0.7
[nodemon] reading config ./nodemon.json
[nodemon] to restart at any time, enter `rs`
[nodemon] or send SIGHUP to 81315 to restart
[nodemon] ignoring: ./node_modules/**/* ./.next/**/*
[nodemon] watching path(s): controllers/**/* models/**/* config/**/* libs/**/* ssr-server.js
[nodemon] watching extensions: js,json
[nodemon] starting `node server.js`
[nodemon] forking
[nodemon] child pid: 81317
[nodemon] watching 9 files

server.js - file read
process.env.DB_DATABASE: undefined

Loading config
undefined

Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Loaded env from /Users/connorphillips/dev/nextjs/auth-boilerplate/.env
info  - Using external babel configuration from /Users/connorphillips/dev/nextjs/auth-boilerplate/.babelrc
event - compiled successfully

app.prepare() triggered. Express server configuration started below
process.env.DB_DATABASE: email_local


> Ready on http://localhost:3000
Expressjs server listening
process.env.DB_DATABASE: email_local

server.js
mynextjs&ExpressJS服务器：

console.log("Loading config file")
console.log(process.env.DB_DATABASE) // Returns undefined

module.exports = {
  "development": {
    "username": "username",
    "password": "password",
    "database": process.env.DB_DATABASE, // undefined
    "dialect": "postgres"
  },
}

console.log('server.js - file read')
console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns undefined

const express = require('express')
const next = require('next')

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()
    
app.prepare()
.then(() => {
    const server = express()

    console.log('app.prepare() triggered. Express server configuration started below')
    console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!

    //  Setting proxy for session handlng that is required for non-dev servers
    if (!dev){
        server.set('trust poxy', 1)
    }

    //  ExpressJS Routes
    server.use(routes);

    //  Mount the router on the app 
    //  Any routes that aren't handled by ExpressJS are handled by NextJS
    server.get('*', (req, res) => {
        return handle(req, res)
    })

    server.listen(3000, (err) => {
        if (err) throw err
        console.log('> Ready on http://localhost:3000')
        console.log('Expressjs server listening')
        console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!
    })
})
.catch((ex) => {
    console.error(ex.stack)
    process.exit(1)
})

npm run dev

> next-js-boilerplate@0.1.0 dev /Users/user/dev/nextjs/auth-boilerplate
> nodemon server.js

[nodemon] 2.0.7
[nodemon] reading config ./nodemon.json
[nodemon] to restart at any time, enter `rs`
[nodemon] or send SIGHUP to 81315 to restart
[nodemon] ignoring: ./node_modules/**/* ./.next/**/*
[nodemon] watching path(s): controllers/**/* models/**/* config/**/* libs/**/* ssr-server.js
[nodemon] watching extensions: js,json
[nodemon] starting `node server.js`
[nodemon] forking
[nodemon] child pid: 81317
[nodemon] watching 9 files

server.js - file read
process.env.DB_DATABASE: undefined

Loading config
undefined

Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Loaded env from /Users/connorphillips/dev/nextjs/auth-boilerplate/.env
info  - Using external babel configuration from /Users/connorphillips/dev/nextjs/auth-boilerplate/.babelrc
event - compiled successfully

app.prepare() triggered. Express server configuration started below
process.env.DB_DATABASE: email_local


> Ready on http://localhost:3000
Expressjs server listening
process.env.DB_DATABASE: email_local

以下是按执行顺序排列的终端输出：

console.log("Loading config file")
console.log(process.env.DB_DATABASE) // Returns undefined

module.exports = {
  "development": {
    "username": "username",
    "password": "password",
    "database": process.env.DB_DATABASE, // undefined
    "dialect": "postgres"
  },
}

console.log('server.js - file read')
console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns undefined

const express = require('express')
const next = require('next')

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()
    
app.prepare()
.then(() => {
    const server = express()

    console.log('app.prepare() triggered. Express server configuration started below')
    console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!

    //  Setting proxy for session handlng that is required for non-dev servers
    if (!dev){
        server.set('trust poxy', 1)
    }

    //  ExpressJS Routes
    server.use(routes);

    //  Mount the router on the app 
    //  Any routes that aren't handled by ExpressJS are handled by NextJS
    server.get('*', (req, res) => {
        return handle(req, res)
    })

    server.listen(3000, (err) => {
        if (err) throw err
        console.log('> Ready on http://localhost:3000')
        console.log('Expressjs server listening')
        console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!
    })
})
.catch((ex) => {
    console.error(ex.stack)
    process.exit(1)
})

npm run dev

> next-js-boilerplate@0.1.0 dev /Users/user/dev/nextjs/auth-boilerplate
> nodemon server.js

[nodemon] 2.0.7
[nodemon] reading config ./nodemon.json
[nodemon] to restart at any time, enter `rs`
[nodemon] or send SIGHUP to 81315 to restart
[nodemon] ignoring: ./node_modules/**/* ./.next/**/*
[nodemon] watching path(s): controllers/**/* models/**/* config/**/* libs/**/* ssr-server.js
[nodemon] watching extensions: js,json
[nodemon] starting `node server.js`
[nodemon] forking
[nodemon] child pid: 81317
[nodemon] watching 9 files

server.js - file read
process.env.DB_DATABASE: undefined

Loading config
undefined

Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Loaded env from /Users/connorphillips/dev/nextjs/auth-boilerplate/.env
info  - Using external babel configuration from /Users/connorphillips/dev/nextjs/auth-boilerplate/.babelrc
event - compiled successfully

app.prepare() triggered. Express server configuration started below
process.env.DB_DATABASE: email_local


> Ready on http://localhost:3000
Expressjs server listening
process.env.DB_DATABASE: email_local

执行命令摘要：

console.log("Loading config file")
console.log(process.env.DB_DATABASE) // Returns undefined

module.exports = {
  "development": {
    "username": "username",
    "password": "password",
    "database": process.env.DB_DATABASE, // undefined
    "dialect": "postgres"
  },
}

console.log('server.js - file read')
console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns undefined

const express = require('express')
const next = require('next')

const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()
    
app.prepare()
.then(() => {
    const server = express()

    console.log('app.prepare() triggered. Express server configuration started below')
    console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!

    //  Setting proxy for session handlng that is required for non-dev servers
    if (!dev){
        server.set('trust poxy', 1)
    }

    //  ExpressJS Routes
    server.use(routes);

    //  Mount the router on the app 
    //  Any routes that aren't handled by ExpressJS are handled by NextJS
    server.get('*', (req, res) => {
        return handle(req, res)
    })

    server.listen(3000, (err) => {
        if (err) throw err
        console.log('> Ready on http://localhost:3000')
        console.log('Expressjs server listening')
        console.log('process.env.DB_DATABASE: ' + process.env.DB_DATABASE) // Returns "db_template". CORRECT!
    })
})
.catch((ex) => {
    console.error(ex.stack)
    process.exit(1)
})

npm run dev

> next-js-boilerplate@0.1.0 dev /Users/user/dev/nextjs/auth-boilerplate
> nodemon server.js

[nodemon] 2.0.7
[nodemon] reading config ./nodemon.json
[nodemon] to restart at any time, enter `rs`
[nodemon] or send SIGHUP to 81315 to restart
[nodemon] ignoring: ./node_modules/**/* ./.next/**/*
[nodemon] watching path(s): controllers/**/* models/**/* config/**/* libs/**/* ssr-server.js
[nodemon] watching extensions: js,json
[nodemon] starting `node server.js`
[nodemon] forking
[nodemon] child pid: 81317
[nodemon] watching 9 files

server.js - file read
process.env.DB_DATABASE: undefined

Loading config
undefined

Browserslist: caniuse-lite is outdated. Please run:
npx browserslist@latest --update-db
Loaded env from /Users/connorphillips/dev/nextjs/auth-boilerplate/.env
info  - Using external babel configuration from /Users/connorphillips/dev/nextjs/auth-boilerplate/.babelrc
event - compiled successfully

app.prepare() triggered. Express server configuration started below
process.env.DB_DATABASE: email_local


> Ready on http://localhost:3000
Expressjs server listening
process.env.DB_DATABASE: email_local

已读取server.js文件
已读取config/sequelize.js文件
从.env.development加载的环境
已触发server.js app.prepare（）
已触发server.js server.listen（）

我遇到了同样的问题

在执行app.prepare（）之前，将初始化代码顶部导入的模块。
我认为您的

config/sequelize.js

是从

“routes”

模块导入的

我的解决方法是将

“路由”

导入app.prepare（）.then（）

app.prepare（）
.然后（（）=>{
...
//ExpressJS路线
//使用require，因为javascirpt导入已挂起。
使用（require（'./您的路由路径'）；//如果使用module.exports
使用（require（'./您的路由路径'）.default）；//如果使用导出默认值
...
})

正在使用的

config/sequelize.js

在哪里？Hey@juliomalves它正在我的sequelize ORM索引模型文件中使用，并传递给sequelize包的新实例

new sequelize（config.database，…）。这就是问题所在，因为它启动Sequelize并抛出一个错误，表示没有传递值