How to configure the region in the AWS js SDK?

Question 1

My problem

I am writing a simple js function that reads some information from AWS CloudWatch Logs.

Following the answer at Configuring region in Node.js AWS SDK, and the AWS nodejs SDK documentation, I came up with the following:

Code

var AWS = require('aws-sdk');

var cloudwatchlogs = new AWS.CloudWatchLogs();

console.log(AWS.config.region)              // Undefined

AWS.config.region = 'eu-central-1'          // Define the region with dot notation
console.log(AWS.config.region) .            // eu-central-1

AWS.config.update({region:'eu-central-1'}); // Another way to update
console.log(AWS.config.region) .            // eu-central-1


var params = {
  limit: 0,
//   logGroupNamePrefix: 'STRING_VALUE',
//   nextToken: 'STRING_VALUE'
};

// This call is failing
cloudwatchlogs.describeLogGroups(params, function(err, data) {
  if (err) console.log(err, err.stack); // an error occurred
  else     console.log(data);           // successful response
});

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var AWS = require('aws-sdk');

var cloudwatchlogs = new AWS.CloudWatchLogs();

console.log(AWS.config.region) // Undefined

AWS.config.region = 'eu-central-1' // Define the region with dot notation

console.log(AWS.config.region) . // eu-central-1

AWS.config.update({region:'eu-central-1'}); // Another way to update

console.log(AWS.config.region) . // eu-central-1

var params = {

limit: 0,

// logGroupNamePrefix: 'STRING_VALUE',

// nextToken: 'STRING_VALUE'

};

// This call is failing

cloudwatchlogs.describeLogGroups(params, function(err, data) {

if (err) console.log(err, err.stack); // an error occurred

else console.log(data); // successful response

});

Output and error

undefined
eu-central-1
eu-central-1
{ ConfigError: Missing region in config
    at Request.VALIDATE_REGION (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:91:45)
    at Request.callListeners (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/sequential_executor.js:105:20)
    at callNextListener (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/sequential_executor.js:95:12)
    at /Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:85:9
    at finish (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:315:7)
    at /Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:333:9
    at SharedIniFileCredentials.get (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/credentials.js:126:7)
    at getAsyncCredentials (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:327:24)
    at Config.getCredentials (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:347:9)
    at Request.VALIDATE_CREDENTIALS (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:80:26)
  message: 'Missing region in config',
  code: 'ConfigError',
  time: 2017-07-11T09:57:55.638Z } ...

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undefined

eu-central-1

{ ConfigError: Missing region in config

at Request.VALIDATE_REGION (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:91:45)

at Request.callListeners (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/sequential_executor.js:105:20)

at callNextListener (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/sequential_executor.js:95:12)

at /Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:85:9

at finish (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:315:7)

at /Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:333:9

at SharedIniFileCredentials.get (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/credentials.js:126:7)

at getAsyncCredentials (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:327:24)

at Config.getCredentials (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/config.js:347:9)

at Request.VALIDATE_CREDENTIALS (/Users/adam/binaris/adam-test-sls/node_modules/aws-sdk/lib/event_listeners.js:80:26)

message: 'Missing region in config',

code: 'ConfigError',

time: 2017-07-11T09:57:55.638Z } ...

Environment

The code is running locally under node v8.1.2.

My question

How can I correctly configure the region in the AWS js SDK?

Addendum

Opened an issue on github and got some response.

Question 2

Or, alternatively, you can specify that when creating your cloudwatch object:

var AWS = require('aws-sdk');
var cloudwatchlogs = new AWS.CloudWatchLogs({region: 'eu-central-1'});

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var AWS = require('aws-sdk');

var cloudwatchlogs = new AWS.CloudWatchLogs({region: 'eu-central-1'});