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title weight description
Exporters 50 Process and export your telemetry data

{{% docs/languages/exporters/intro js %}}

Dependencies

If you want to send telemetry data to an OTLP endpoint (like the OpenTelemetry Collector, Jaeger or Prometheus), you can choose between three different protocols to transport your data:

Start by installing the respective exporter packages as a dependency for your project:

{{< tabpane text=true >}} {{% tab "HTTP/Proto" %}}

npm install --save @opentelemetry/exporter-trace-otlp-proto \
  @opentelemetry/exporter-metrics-otlp-proto

{{% /tab %}} {{% tab "HTTP/JSON" %}}

npm install --save @opentelemetry/exporter-trace-otlp-http \
  @opentelemetry/exporter-metrics-otlp-http

{{% /tab %}} {{% tab gRPC %}}

npm install --save @opentelemetry/exporter-trace-otlp-grpc \
  @opentelemetry/exporter-metrics-otlp-grpc

{{% /tab %}} {{< /tabpane >}}

Usage with Node.js

Next, configure the exporter to point at an OTLP endpoint. For example you can update the file instrumentation.ts (or instrumentation.js if you use JavaScript) from the Getting Started like the following to export traces and metrics via OTLP (http/protobuf) :

{{< tabpane text=true >}} {{% tab Typescript %}}

/*instrumentation.ts*/
import * as opentelemetry from '@opentelemetry/sdk-node';
import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';
import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-proto';
import { OTLPMetricExporter } from '@opentelemetry/exporter-metrics-otlp-proto';
import { PeriodicExportingMetricReader } from '@opentelemetry/sdk-metrics';

const sdk = new opentelemetry.NodeSDK({
  traceExporter: new OTLPTraceExporter({
    // optional - default url is http://localhost:4318/v1/traces
    url: '<your-otlp-endpoint>/v1/traces',
    // optional - collection of custom headers to be sent with each request, empty by default
    headers: {},
  }),
  metricReader: new PeriodicExportingMetricReader({
    exporter: new OTLPMetricExporter({
      url: '<your-otlp-endpoint>/v1/metrics', // url is optional and can be omitted - default is http://localhost:4318/v1/metrics
      headers: {}, // an optional object containing custom headers to be sent with each request
    }),
  }),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{% tab JavaScript %}}

/*instrumentation.js*/
const opentelemetry = require('@opentelemetry/sdk-node');
const {
  getNodeAutoInstrumentations,
} = require('@opentelemetry/auto-instrumentations-node');
const {
  OTLPTraceExporter,
} = require('@opentelemetry/exporter-trace-otlp-proto');
const {
  OTLPMetricExporter,
} = require('@opentelemetry/exporter-metrics-otlp-proto');
const { PeriodicExportingMetricReader } = require('@opentelemetry/sdk-metrics');

const sdk = new opentelemetry.NodeSDK({
  traceExporter: new OTLPTraceExporter({
    // optional - default url is http://localhost:4318/v1/traces
    url: '<your-otlp-endpoint>/v1/traces',
    // optional - collection of custom headers to be sent with each request, empty by default
    headers: {},
  }),
  metricReader: new PeriodicExportingMetricReader({
    exporter: new OTLPMetricExporter({
      url: '<your-otlp-endpoint>/v1/metrics', // url is optional and can be omitted - default is http://localhost:4318/v1/metrics
      headers: {}, // an optional object containing custom headers to be sent with each request
      concurrencyLimit: 1, // an optional limit on pending requests
    }),
  }),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{< /tabpane >}}

Usage in the Browser

When you use the OTLP exporter in a browser-based application, you need to note that:

  1. Using gRPC for exporting is not supported
  2. Content Security Policies (CSPs) of your website might block your exports
  3. Cross-Origin Resource Sharing (CORS) headers might not allow your exports to be sent
  4. You might need to expose your collector to the public internet

Below you will find instructions to use the right exporter, to configure your CSPs and CORS headers and what precautions you have to take when exposing your collector.

Use OTLP exporter with HTTP/JSON or HTTP/protobuf

OpenTelemetry Collector Exporter with gRPC works only with Node.js, therefore you are limited to use the OpenTelemetry Collector Exporter with HTTP/JSON or OpenTelemetry Collector Exporter with HTTP/protobuf.

Make sure that the receiving end of your exporter (collector or observability backend) accepts http/json if you are using OpenTelemetry Collector Exporter with HTTP/JSON, and that you are exporting your data to the right endpoint with your port set to 4318.

Configure CSPs

If your website is making use of Content Security Policies (CSPs), make sure that the domain of your OTLP endpoint is included. If your collector endpoint is https://collector.example.com:4318/v1/traces, add the following directive:

connect-src collector.example.com:4318/v1/traces

If your CSP is not including the OTLP endpoint, you will see an error message, stating that the request to your endpoint is violating the CSP directive.

Configure CORS headers

If your website and collector are hosted at a different origin, your browser might block the requests going out to your collector. You need to configure special headers for Cross-Origin Resource Sharing (CORS).

The OpenTelemetry Collector provides a feature for http-based receivers to add the required headers to allow the receiver to accept traces from a web browser:

receivers:
  otlp:
    protocols:
      http:
        include_metadata: true
        cors:
          allowed_origins:
            - https://foo.bar.com
            - https://*.test.com
          allowed_headers:
            - Example-Header
          max_age: 7200

Securely expose your collector

To receive telemetry from a web application you need to allow the browsers of your end-users to send data to your collector. If your web application is accessible from the public internet, you also have to make your collector accessible for everyone.

It is recommended that you do not expose your collector directly, but that you put a reverse proxy (NGINX, Apache HTTP Server, ...) in front of it. The reverse proxy can take care of SSL-offloading, setting the right CORS headers, and many other features specific to web applications.

Below you will find a configuration for the popular NGINX web server to get you started:

server {
    listen 80 default_server;
    server_name _;
    location / {
        # Take care of preflight requests
        if ($request_method = 'OPTIONS') {
             add_header 'Access-Control-Max-Age' 1728000;
             add_header 'Access-Control-Allow-Origin' 'name.of.your.website.example.com' always;
             add_header 'Access-Control-Allow-Headers' 'Accept,Accept-Language,Content-Language,Content-Type' always;
             add_header 'Access-Control-Allow-Credentials' 'true' always;
             add_header 'Content-Type' 'text/plain charset=UTF-8';
             add_header 'Content-Length' 0;
             return 204;
        }

        add_header 'Access-Control-Allow-Origin' 'name.of.your.website.example.com' always;
        add_header 'Access-Control-Allow-Credentials' 'true' always;
        add_header 'Access-Control-Allow-Headers' 'Accept,Accept-Language,Content-Language,Content-Type' always;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_pass http://collector:4318;
    }
}

Console

To debug your instrumentation or see the values locally in development, you can use exporters writing telemetry data to the console (stdout).

If you followed the Getting Started or Manual Instrumentation guides, you already have the console exporter installed.

The ConsoleSpanExporter is included in the @opentelemetry/sdk-trace-node package and the ConsoleMetricExporter is included in the @opentelemetry/sdk-metrics package:

{{% docs/languages/exporters/jaeger %}}

{{% docs/languages/exporters/prometheus-setup %}}

Dependencies

Install the exporter package as a dependency for your application:

npm install --save @opentelemetry/exporter-prometheus

Update your OpenTelemetry configuration to use the exporter and to send data to your Prometheus backend:

{{< tabpane text=true >}} {{% tab Typescript %}}

import * as opentelemetry from '@opentelemetry/sdk-node';
import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';
import { PrometheusExporter } from '@opentelemetry/exporter-prometheus';

const sdk = new opentelemetry.NodeSDK({
  metricReader: new PrometheusExporter({
    port: 9464, // optional - default is 9464
  }),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{% tab JavaScript %}}

const opentelemetry = require('@opentelemetry/sdk-node');
const {
  getNodeAutoInstrumentations,
} = require('@opentelemetry/auto-instrumentations-node');
const { PrometheusExporter } = require('@opentelemetry/exporter-prometheus');
const { PeriodicExportingMetricReader } = require('@opentelemetry/sdk-metrics');
const sdk = new opentelemetry.NodeSDK({
  metricReader: new PrometheusExporter({
    port: 9464, // optional - default is 9464
  }),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{< /tabpane >}}

With the above you can access your metrics at http://localhost:9464/metrics. Prometheus or an OpenTelemetry Collector with the Prometheus receiver can scrape the metrics from this endpoint.

{{% docs/languages/exporters/zipkin-setup %}}

Dependencies

To send your trace data to Zipkin, you can use the ZipkinExporter.

Install the exporter package as a dependency for your application:

npm install --save @opentelemetry/exporter-zipkin

Update your OpenTelemetry configuration to use the exporter and to send data to your Zipkin backend:

{{< tabpane text=true >}} {{% tab Typescript %}}

import * as opentelemetry from '@opentelemetry/sdk-node';
import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';
import { ZipkinExporter } from '@opentelemetry/exporter-zipkin';

const sdk = new opentelemetry.NodeSDK({
  traceExporter: new ZipkinExporter({}),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{% tab JavaScript %}}

const opentelemetry = require('@opentelemetry/sdk-node');
const {
  getNodeAutoInstrumentations,
} = require('@opentelemetry/auto-instrumentations-node');
const { ZipkinExporter } = require('@opentelemetry/exporter-zipkin');

const sdk = new opentelemetry.NodeSDK({
  traceExporter: new ZipkinExporter({}),
  instrumentations: [getNodeAutoInstrumentations()],
});

{{% /tab %}} {{< /tabpane >}}

{{% docs/languages/exporters/outro js "https://open-telemetry.github.io/opentelemetry-js/interfaces/_opentelemetry_sdk_trace_base.SpanExporter.html" %}}

{{< tabpane text=true >}} {{% tab Typescript %}}

/*instrumentation.ts*/
import * as opentelemetry from '@opentelemetry/sdk-node';
import { getNodeAutoInstrumentations } from '@opentelemetry/auto-instrumentations-node';

const sdk = new NodeSDK({
  spanProcessor: new SimpleSpanProcessor(exporter),
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{% tab JavaScript %}}

/*instrumentation.js*/
const opentelemetry = require('@opentelemetry/sdk-node');
const {
  getNodeAutoInstrumentations,
} = require('@opentelemetry/auto-instrumentations-node');

const sdk = new opentelemetry.NodeSDK({
  spanProcessor: new SimpleSpanProcessor(exporter)
  instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start();

{{% /tab %}} {{< /tabpane >}}

{{% /docs/languages/exporters/outro %}}