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JavaScript zero-code instrumentation
JavaScript
Capture telemetry from your application with zero source code modifications
/docs/languages/js/automatic

Zero-code instrumentation for JavaScript provides a way to instrument any Node.js application and capture telemetry data from many popular libraries and frameworks without any code changes.

Setup

Run the following commands to install the appropriate packages.

npm install --save @opentelemetry/api
npm install --save @opentelemetry/auto-instrumentations-node

The @opentelemetry/api and @opentelemetry/auto-instrumentations-node packages install the API, SDK, and the instrumentation tools.

Configuring the module

The module is highly configurable.

One option is to configure the module by way of using env to set environment variables from the CLI:

env OTEL_TRACES_EXPORTER=otlp OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=your-endpoint \
node --require @opentelemetry/auto-instrumentations-node/register app.js

Alternatively, you can use export to set environment variables:

export OTEL_TRACES_EXPORTER="otlp"
export OTEL_EXPORTER_OTLP_ENDPOINT="your-endpoint"
export OTEL_NODE_RESOURCE_DETECTORS="env,host,os"
export OTEL_SERVICE_NAME="your-service-name"
export NODE_OPTIONS="--require @opentelemetry/auto-instrumentations-node/register"
node app.js

{{% alert title="Note" color="info" %}}

Currently, only Traces are supported for environment variable configuration. See the open issues for Metrics and Logs to learn more.

{{% /alert %}}

By default, all SDK resource detectors are used. You can use the environment variable OTEL_NODE_RESOURCE_DETECTORS to enable only certain detectors, or to completely disable them.

To see the full range of configuration options, see Module Configuration.

Supported libraries and frameworks

A number of popular Node.js libraries are auto-instrumented. For the full list, see supported instrumentation.

Troubleshooting

You can set the log level by setting the OTEL_LOG_LEVEL environment variable to one of the following:

  • none
  • error
  • warn
  • info
  • debug
  • verbose
  • all

The default level is info.

{{% alert title="Notes" color="info" %}}

  • In a production environment, it is recommended to set OTEL_LOG_LEVEL to info.
  • Logs are always sent to console, no matter the environment or debug level.
  • Debug logs are extremely verbose and can negatively impact the performance of your application. Enable debug logging only when needed.

{{% /alert %}}