Config File in NodeJS using npm config

问题

I have a on-cloud SAAS application built on Angular/NodeJS/Postgres+MongoDB stack that can connect to customer DB, cloud warehouses, S3 buckets etc to load information. Once I get the connection information from Angular front-end I need to store this information for future retrieval .

Example :
Angular Front-end
<form>
Database Type : 
Host : 
Port : 
Username: 
Password :

S3Bucket : 
Region :
bucket-name :
Access key :
</form>

etc.

I need this information saved for later access. As suggested by Abdullah Deliogullari in the original question, I am trying to use config module npm config. But how do I use package config to write config file and load it in a running application.

ie While my application is running I need to write the (say S3) bucket info to a customer.config file (from frontend JSON) and later when required to retrieve data use the customer.config to connect to S3 bucket.

The "get" portion I am able to understand but the write portion (adding a new section dynamically) is what I am not able to figure out.

Example from frontend when I pass in the values like


 ["ct_postgres":
       {"host":"3.15.xxx.xxx", 
         "port":"5132",
         "dbname":"wcdb"     
      }]

this should be written to the config file. So something like config.put/write I am looking for. Next time I want to make connection to the customer postgresdb I do config.get() and it provides me the connection details.

Original question

回答1:

First you should install this package

npm install config

After that create config file into your project directory(name "config" is a must). In this file create development.json and production.json files(these names are optional). Content of development.json could be like this

{
  "SERVER" : {
     "port" : 5000
  },

  "PASSWORDHASH" : {
    "saltRounds" : 10
  }
}

In your javascript file for example in app.js file, first you should include the library, and then you can get configuration informations via this module

const config = require('config');
const port = config.get("SERVER.port");
app.listen(port);

Last step should be add this development.json file name to NODE_ENV variable

NODE_ENV=development node app.js

So if you want to update your json file based on new data coming from your frontend, you can basically do this

var fs = require('fs');
var file_content = fs.readFileSync("development.json");
var content = JSON.parse(file_content);
content.SERVER.port = 6000;
fs.writeFileSync("development.json", JSON.stringify(content));

来源：https://stackoverflow.com/questions/64781386/config-file-in-nodejs-using-npm-config

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javascript

node.js

express