Encountered an error with Winston and Elasticsearch integration: "TypeError: Elasticsearch is not a constructor

I recently implemented winston-elasticsearch on my express server by following the code provided in the documentation

var winston = require('winston');
var Elasticsearch = require('winston-elasticsearch');

var esTransportOpts = {
  level: 'info'
};
var logger = winston.createLogger({
  transports: [
    new Elasticsearch(esTransportOpts)
  ]
});

Upon starting the server, I encountered the following error:

TypeError: Elasticsearch is not a constructor

Both the "winston" and "winston-elasticsearch" packages are up-to-date with versions "^3.2.1" and "^0.8.8", respectively.

javascriptexpresselasticsearchloggingwinston

Answer №1

@asma's recommendation to switch back to version 0.7.x resolved the error I was experiencing. However, this meant I was using an outdated version that led to a new error fixed in the most recent release.

Regarding @joe's concern, it seems that the issue has been addressed and users have adapted to the changes by adjusting their syntax. Nonetheless, the README still contains information about the old syntax.

To make version 0.8.8 work for me, I had to modify the example code as shown below:

var winston = require('winston');
var winstonElasticSearch = require('winston-elasticsearch');

var esTransportOpts = {
  level: 'info'
};
var logger = winston.createLogger({
  transports: [
    new winstonElasticSearch.ElasticsearchTransport(esTransportOpts)
  ]
});

Answer №2

To ensure compatibility with Winston 3.x and Elasticsearch 6.0 onwards, you should opt for version 0.7.0. For users of Elasticsearch 6.0 and newer, version 0.6.0 is recommended. If you are working with Elasticsearch 5.0 or later versions, version 0.5.9 is the way to go. Those using earlier iterations should stick to the 0.4.x series.

Answer №3

Fixing the issue by downgrading to version "winston-elasticsearch": "0.7.0".

According to the documentation:

For compatibility with Winston 3.x and Elasticsearch 6.0 onwards, use version 0.7.0. For Elasticsearch 6.0 and later, use version 0.6.0. For Elasticsearch 5.0 and above, use version 0.5.9. For older versions, stick to the 0.4.x series.

source: https://www.npmjs.com/package/winston-elasticsearch

Answer №4

There is currently an ongoing unresolved issue related to this specific matter.

In the interim, you have the option to execute 

npm i --save <a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="84f3edeaf7f0ebeaa9e1e8e5f7f0ede7f7e1e5f6e7ecc4b4aab3aab5b6">[email protected]</a>
.

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