Get environment specific configuration from a JSON object using Lodash

Given that I have the following JSON object,

dbConfig = {
    "db": "default",
    "default": {
        "defaultDB": "sqlite",
        "init": "init",
        "migrations": {
            "directory": "migrations",
            "tableName": "migrations"
        },
        "pool": {
            "min": "2",
            "max": "10"
        },
        "sqlite": {
            "client": "sqlite3",
            "connection": {
                "filename": "data/default/sqlitedb/test.db"
            }
        },
        "oracle": {
            "client": "oracledb",
            "config": {
                "development": {
                    "user": "test",
                    "pass": "test",
                    "db": "test"
                },
                "production": {
                    "user": "test",
                    "pass": "test",
                    "db": "test"
                },
                "test": {
                    "user": "test",
                    "pass": "test",
                    "db": "test"
                }
            }
        }
    }
};

Using Node & Lodash, is there any possibility of getting either connection or config. depending on what dbConfig.default[dbConfig.default.defaultDB] is set to.

So for instance if i set dbConfig.default.defaultDB=oracledb and process.env.NODE_ENV=development I want to be able to get dbConfig.default[dbConfig.default.defaultDB].config.development

Or if I set dbConfig.default.defaultDB=sqlite just to get dbConfig.default[dbConfig.default.defaultDB].connection

In other words, if the database has environment specific configuration then this will be in "config": {} and if not in "connection": {}

It doesn't have to be Lodash. It can also be plain javascript.

Solution without lodash

var defaultDbName = dbConfig.default[dbConfig.default.defaultDB];

var db;
if (defaultDb === 'sqllite') {
  db = dbConfig.default[defaultDb].connection;
} else {
  var env = process.env.NODE_ENV;
  db = dbConfig.default[defaultDb].config[env];
}

Solution with lodash

Here I'm using lodash get function to get object field value or null if it doesn't exist. Also I'm using template string syntax: ${val} to format field path.

var defaultDbName = dbConfig.default[dbConfig.default.defaultDB];
var defaultDbConf = dbConfig.default[defaultDb];
var env = process.env.NODE_ENV;

var db = defaultDbConf.connection || _.get(defaultDbConf, `config.${env}`);

Btw, your configuration json is too complex, much better to have configuration per environment.