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--- | ||
title: "Javascript" | ||
weight: 20 | ||
description: > | ||
<img width="35" src="https://raw.github.com/open-telemetry/opentelemetry.io/main/iconography/32x32/JS_SDK.svg"></img> | ||
A language-specific implementation of OpenTelemetry in JavaScript (for Node.JS & the browser). | ||
--- | ||
|
||
This page contains an introduction to OpenTelemetry in JavaScript. This guide | ||
will walk you through installation and instrumentation and show you how to | ||
export data. | ||
|
||
## Status and Releases | ||
|
||
| Tracing | Metrics | | ||
| ------- | ------- | | ||
| Beta | Alpha | | ||
|
||
You can find release information [here](https://github.com/open-telemetry/opentelemetry-js/releases) | ||
|
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## Further Reading | ||
|
||
- [OpenTelemetry for JavaScript on GitHub](https://github.com/open-telemetry/opentelemetry-js) | ||
- [Getting Started](https://github.com/open-telemetry/opentelemetry-js/blob/main/getting-started/README.md) | ||
- [API Documentation](https://open-telemetry.github.io/opentelemetry-js) | ||
- [Getting In Touch (Gitter)](https://gitter.im/open-telemetry/opentelemetry-node) |
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--- | ||
title: "Getting Started" | ||
weight: 1 | ||
--- | ||
These two guides for Node.JS and the browser use simple examples in javascript to get you started with OpenTelemetry. Both will show you the following steps: | ||
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- Install the required OpenTelemetry libraries | ||
- Initialize a global [tracer](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#tracer) | ||
- Initialize and register a [span exporter](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#span-exporter) |
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--- | ||
title: "Browser" | ||
weight: 2 | ||
--- | ||
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This guide uses the example application in HTML & javascript provided below, but the steps to instrument your own application should be broadly the same. Here is an overview of what we will be doing. | ||
|
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- Install the required OpenTelemetry libraries | ||
- Initialize a global [tracer](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#tracer) | ||
- Initialize and register a [span exporter](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#span-exporter) | ||
|
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This is a very simple guide, if you'd like to see more complex examples go to [examples/tracer-web](https://github.com/open-telemetry/opentelemetry-js/tree/main/examples/tracer-web) | ||
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Copy the following file into an empty directory and call it `index.html`. | ||
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```html | ||
<!DOCTYPE html> | ||
<html lang="en"> | ||
<head> | ||
<meta charset="utf-8"> | ||
<title>Document Load Plugin Example</title> | ||
<base href="/"> | ||
<!-- | ||
https://www.w3.org/TR/trace-context/ | ||
Set the `traceparent` in the server's HTML template code. It should be | ||
dynamically generated server side to have the server's request trace Id, | ||
a parent span Id that was set on the server's request span, and the trace | ||
flags to indicate the server's sampling decision | ||
(01 = sampled, 00 = notsampled). | ||
'{version}-{traceId}-{spanId}-{sampleDecision}' | ||
--> | ||
<meta name="traceparent" content="00-ab42124a3c573678d4d8b21ba52df3bf-d21f7bc17caa5aba-01"> | ||
<meta name="viewport" content="width=device-width, initial-scale=1"> | ||
</head> | ||
<body> | ||
Example of using Web Tracer with document load plugin with console exporter and collector exporter | ||
</body> | ||
</html> | ||
``` | ||
|
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## Installation | ||
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To create traces in the browser, you will need `@opentelemetry/web`, and the plugin `@opentelemetry/plugin-document-load`: | ||
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```shell | ||
npm install @opentelemetry/web @opentelemetry/plugin-document-load | ||
``` | ||
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In the following we will use parcel as web application bundler, but you can of course also use any other build tool: | ||
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```shell | ||
npm install -g parcel | ||
``` | ||
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## Initialization and Configuration | ||
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Create a empty file called `document-load.js` and add the following code to your html right before the body end tag: | ||
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```html | ||
<script type="text/javascript" src="document-load.js"></script> | ||
``` | ||
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We will add some code that will trace the document load timings and output those as OpenTelemetry Spans. | ||
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## Creating a Tracer Provider | ||
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Add the following code to the `document-load.js` to create a tracer provider, which brings the plugin to trace document load: | ||
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```javascript | ||
// This is necessary for "parcel" to work OOTB. It is not needed for other build tools. | ||
import 'regenerator-runtime/runtime' | ||
import { LogLevel } from "@opentelemetry/core"; | ||
import { WebTracerProvider } from '@opentelemetry/web'; | ||
import { DocumentLoad } from '@opentelemetry/plugin-document-load'; | ||
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// Minimum required setup - supports only synchronous operations | ||
const provider = new WebTracerProvider({ | ||
plugins: [ | ||
new DocumentLoad() | ||
] | ||
}); | ||
provider.register(); | ||
``` | ||
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Run `parcel index.html` and open the development webserver (e.g. at `http://localhost:1234`) to see if your code works. | ||
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There will be no output of traces yet, for this we need to add an exporter | ||
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## Creating a Console Exporter | ||
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To export traces, modify `document-load.js` so that it matches the following code snippet: | ||
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```javascript | ||
// This is necessary for "parcel" to work OOTB. It is not needed for other build tools. | ||
import 'regenerator-runtime/runtime' | ||
import { LogLevel } from "@opentelemetry/core"; | ||
import { WebTracerProvider } from '@opentelemetry/web'; | ||
import { DocumentLoad } from '@opentelemetry/plugin-document-load'; | ||
import { ConsoleSpanExporter, SimpleSpanProcessor } from '@opentelemetry/tracing'; | ||
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// Minimum required setup - supports only synchronous operations | ||
const provider = new WebTracerProvider({ | ||
plugins: [ | ||
new DocumentLoad() | ||
] | ||
}); | ||
provider.addSpanProcessor(new SimpleSpanProcessor(new ConsoleSpanExporter())) | ||
provider.register(); | ||
``` | ||
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Now, rebuild your application and open the browser again. In the console of the developer toolbar you should see some traces being exporterd: | ||
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```json | ||
{ | ||
"traceId": "ab42124a3c573678d4d8b21ba52df3bf", | ||
"parentId": "cfb565047957cb0d", | ||
"name": "documentFetch", | ||
"id": "5123fc802ffb5255", | ||
"kind": 0, | ||
"timestamp": 1606814247811266, | ||
"duration": 9390, | ||
"attributes": { | ||
"component": "document-load", | ||
"http.response_content_length": 905 | ||
}, | ||
"status": { | ||
"code": 0 | ||
}, | ||
"events": [ | ||
{ | ||
"name": "fetchStart", | ||
"time": [ | ||
1606814247, | ||
811266158 | ||
] | ||
}, | ||
{ | ||
"name": "domainLookupStart", | ||
"time": [ | ||
1606814247, | ||
811266158 | ||
] | ||
}, | ||
{ | ||
"name": "domainLookupEnd", | ||
"time": [ | ||
1606814247, | ||
811266158 | ||
] | ||
}, | ||
{ | ||
"name": "connectStart", | ||
"time": [ | ||
1606814247, | ||
811266158 | ||
] | ||
}, | ||
{ | ||
"name": "connectEnd", | ||
"time": [ | ||
1606814247, | ||
811266158 | ||
] | ||
}, | ||
{ | ||
"name": "requestStart", | ||
"time": [ | ||
1606814247, | ||
819101158 | ||
] | ||
}, | ||
{ | ||
"name": "responseStart", | ||
"time": [ | ||
1606814247, | ||
819791158 | ||
] | ||
}, | ||
{ | ||
"name": "responseEnd", | ||
"time": [ | ||
1606814247, | ||
820656158 | ||
] | ||
} | ||
] | ||
} | ||
``` |
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