Open source


Using the Elasticsearch k6 extension, you can store k6 metrics in Elasticsearch and analyze your performance results with Kibana or Grafana.

Build the k6 version

To build a k6 binary with the extension, first, make sure you have Go and Git installed on your machine.

Then, open your terminal and run the following commands:

# Install xk6
go install

# Build the k6 binary
xk6 build --with

... [INFO] Build environment ready
... [INFO] Building k6
... [INFO] Build complete: ./k6

xk6 will create the new k6 binary in the local folder.

Note: To learn more about how to build custom k6 versions, check out xk6.

Run the test

Check that the Elasticsearch instance to store the k6 metrics is running.

If you’re running on Elasticsearch cloud, use the previous k6 binary and run the test passing the cloud credentials as follows:

# export cloud configuration
export K6_ELASTICSEARCH_CLOUD_ID=your-cloud-id-here
export K6_ELASTICSEARCH_USER=your-user-here
export K6_ELASTICSEARCH_PASSWORD=your-password-here

# run the test
./k6 run script.js -o output-elasticsearch

k6 runs the test script and sends the metrics in real-time to Elasticsearch.

You can also send the metrics to a local Elasticsearch cluster:

# export local url
export K6_ELASTICSEARCH_URL=http://localhost:9200

# run the test
./k6 run script.js -o output-elasticsearch
Caution: Security and self-signed certificates for non-cloud clusters are not yet supported.

You can now connect to Elasticsearch and query the k6 metrics stored in the k6-metrics index. The following example uses an unsecured local Elasticsearch, version 7.17.9:

curl -XGET 'http://localhost:9200/k6-metrics/_search?pretty' -H 'Content-Type: application/json' -d'
  "sort": [
      "Time": {
        "order": "desc"
  "size": 10

Or use Kibana Discover:

Kibana Discover k6 results


Here is the full list of options that can be configured and passed to the extension:

K6_ELASTICSEARCH_CLOUD_IDElasticsearch, which can be found in the Elastic Cloud web console.
K6_ELASTICSEARCH_FLUSH_PERIODDefine how often metrics are sent to Elasticsearch. The default value is 1 second.
K6_ELASTICSEARCH_USERElasticsearch username.
K6_ELASTICSEARCH_PASSWORDElasticsearch password.