instrumentation

@opentelemetry/browser-instrumentation

OpenTelemetry browser instrumentations, available as subpath exports under ./experimental/*.

Installation

npm install @opentelemetry/browser-instrumentation

Instrumentations

Navigation — automatic instrumentation for browser navigations (initial load and SPA route changes)
Navigation Timing — automatic instrumentation for navigation timing
Resource Timing — automatic instrumentation for resource timing
User Action — automatic instrumentation for user actions (clicks)
Web Vitals — automatic instrumentation for Core Web Vitals
Console — automatic instrumentation for console API calls (log, warn, error, info, debug)
Errors — automatic instrumentation for unhandled errors and promise rejections
Fetch — automatic instrumentation for request using the fetch API

Usage

import { logs } from '@opentelemetry/api-logs';
import {
  ConsoleLogRecordExporter,
  LoggerProvider,
  SimpleLogRecordProcessor,
} from '@opentelemetry/sdk-logs';
import { registerInstrumentations } from '@opentelemetry/instrumentation';
import { ErrorsInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/errors';
import { NavigationInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/navigation';
import { NavigationTimingInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/navigation-timing';
import { ResourceTimingInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/resource-timing';
import { UserActionInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/user-action';
import { WebVitalsInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/web-vitals';

const logProvider = new LoggerProvider({
  processors: [
    new SimpleLogRecordProcessor(new ConsoleLogRecordExporter()),
  ],
});
logs.setGlobalLoggerProvider(logProvider);

registerInstrumentations({
  instrumentations: [
    new ErrorsInstrumentation(),
    new NavigationInstrumentation(),
    new NavigationTimingInstrumentation(),
    new ResourceTimingInstrumentation(),
    new UserActionInstrumentation(),
    new WebVitalsInstrumentation(),
  ],
});

Navigation

import { NavigationInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/navigation';

Emits a browser.navigation event for the initial page load (hard navigation) and for subsequent in-page navigations (soft navigations), including history.pushState, history.replaceState, popstate, and hash changes. When enabled via config, the Navigation API is used in preference to patching history.

Configuration

import {
  NavigationInstrumentation,
  defaultSanitizeUrl,
} from '@opentelemetry/browser-instrumentation/experimental/navigation';

new NavigationInstrumentation({
  // Use window.navigation (Navigation API) when available instead of
  // patching history.pushState / history.replaceState. Default: false.
  useNavigationApiIfAvailable: true,

  // Rewrite the captured URL before it is emitted. Useful for stripping
  // path segments, query parameters, or tokens that should not be exported.
  sanitizeUrl: (url) => defaultSanitizeUrl(url),

  // Mutate the log record before it is emitted (e.g. attach custom attributes).
  applyCustomLogRecordData: (logRecord) => {
    logRecord.attributes = {
      ...logRecord.attributes,
      'app.route.id': '...',
    };
  },
});

Option	Type	Default	Description
`useNavigationApiIfAvailable`	`boolean`	`false`	When `true`, subscribes to the Navigation API (`currententrychange`) instead of patching `history.pushState` / `history.replaceState`. Falls back to history patching when the Navigation API is unavailable.
`sanitizeUrl`	`(url: string) => string`	—	Called before the URL is written to `url.full`.
`applyCustomLogRecordData`	`(logRecord: LogRecord) => void`	—	Hook to modify log records before they are emitted. Errors thrown from this hook are caught and logged via the instrumentation diag logger.

defaultSanitizeUrl is exported for composition — it redacts user:password@ credentials and a set of common sensitive query parameters (api_key, token, password, etc.).

Captured Attributes

Each browser.navigation event includes:

Attribute	Description
`url.full`	The destination URL (after `sanitizeUrl` if configured).
`browser.navigation.same_document`	`true` for SPA route changes; `false` for full-page loads.
`browser.navigation.hash_change`	`true` when the navigation only adds or changes the URL fragment.
`browser.navigation.type`	One of `push`, `replace`, `reload`, `traverse` (omitted for the initial hard navigation).

Navigation Timing

import { NavigationTimingInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/navigation-timing';

Provides automatic instrumentation for Navigation Timing in web applications.

Resource Timing

import { ResourceTimingInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/resource-timing';

Provides automatic instrumentation for Resource Timing in web applications, capturing performance metrics for all resources loaded by the browser (scripts, stylesheets, images, fonts, XHR/fetch requests, etc.).

Uses requestIdleCallback to avoid blocking the main thread (with automatic setTimeout fallback for Safari)
Processes resources in configurable batches
Captures historical resources loaded before instrumentation was enabled via buffered mode
Flushes pending entries on visibility change to prevent data loss

Configuration

new ResourceTimingInstrumentation({
  // Process 100 resources per batch (default: 50)
  batchSize: 100,

  // Wait max 2 seconds for idle time before forcing processing (default: 1000)
  forceProcessingAfter: 2000,

  // Spend max 100ms processing per idle callback (default: 50)
  maxProcessingTime: 100,

  // Maximum queue size before forcing immediate flush (default: 1000)
  maxQueueSize: 2000,
});

Option	Type	Default	Description
`batchSize`	`number`	`50`	Number of resources to process per batch.
`forceProcessingAfter`	`number`	`1000`	Maximum time (ms) to wait for an idle callback before forcing processing.
`maxProcessingTime`	`number`	`50`	Maximum time (ms) to spend processing resources per idle callback.
`maxQueueSize`	`number`	`1000`	Maximum number of resources to queue before forcing immediate flush.

Captured Data

Each resource timing event includes:

URL and Initiator Type (script, css, img, xmlhttprequest, fetch, etc.)
Duration — total resource load time
Timing Phases — DNS lookup, TCP connection, TLS handshake, request, response
Size Metrics — transfer size, encoded size, decoded size
Protocol — HTTP version (h1, h2, h3)
Redirect Info — redirect timing if applicable
Service Worker — worker start time if intercepted
Render Blocking — whether the resource blocked rendering (Chromium only)

User Action

import { UserActionInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/user-action';

Provides automatic instrumentation for user actions in web applications.

Compatible with OpenTelemetry JS API and SDK 1.0+.

Configuration

By default the instrumentation captures click events. You can configure which events to capture by passing an options object:

new UserActionInstrumentation({
  // Array of actions to automatically capture. Default: ['click'].
  autoCapturedActions: [],

  // Mutate the log record before it is emitted (e.g. attach custom attributes).
  applyCustomLogRecordData: (logRecord) => {
    logRecord.attributes = {
      ...logRecord.attributes,
      'app.user.role': 'admin',
    };
  },
});

Option	Type	Default	Description
`autoCapturedActions`	`AutoCapturedUserAction[]`	`['click']`	Array of actions to automatically capture.
`applyCustomLogRecordData`	`(logRecord: LogRecord) => void`	—	Hook to modify log records before they are emitted. Errors thrown from this hook are caught and logged via the instrumentation diag logger.

Additional Attributes

Data attributes with the prefix data-otel- on the target element will be added as additional attributes to the generated log record. For example:

<button id="btn1" data-otel-user-id="12345" data-otel-feature="signup">
  Sign Up
</button>

Web Vitals

import { WebVitalsInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/web-vitals';

Provides automatic instrumentation for Core Web Vitals using the web-vitals library.

Configuration

Option	Type	Default	Description
`includeRawAttribution`	`boolean`	`false`	When true, sets the log record body to the JSON-stringified `web-vitals` attribution object.
`applyCustomLogRecordData`	`(logRecord: LogRecord) => void`	—	Hook to modify log records before they are emitted.

Console

import { ConsoleInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/console';

Provides automatic instrumentation for browser console API calls. By default captures log, warn, error, info, and debug methods.

Configuration

new ConsoleInstrumentation({
  // Specify which console methods to capture (default: log, warn, error, info, debug)
  logMethods: ['error', 'warn'],
});

Captured Attributes

Each browser.console event includes the following attributes:

Attribute	Description	Example
`browser.console.method`	The console method that was called	`error`, `warn`, `log`, `info`, `debug`

Errors

import { ErrorsInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/errors';

Emits an exception event for every uncaught error (window.addEventListener('error', ...)) and unhandled promise rejection (window.addEventListener('unhandledrejection', ...)).

Configuration

new ErrorsInstrumentation({
  // Return extra attributes to attach to the emitted log record.
  applyCustomAttributes: (error) => ({
    'app.error.severity':
      error instanceof Error && error.name === 'ValidationError'
        ? 'warning'
        : 'error',
  }),
});

Option	Type	Default	Description
`applyCustomAttributes`	`(error: Error \| string) => Attributes`	—	Returns extra attributes to merge onto the emitted log record. Errors thrown from this hook are caught and logged via the instrumentation diag logger.

Captured Attributes

Each exception event includes:

Attribute	Description
`exception.type`	The error's `name` (omitted when the thrown value is a string).
`exception.message`	The error's `message`, or the thrown string itself.
`exception.stacktrace`	The error's `stack` (omitted when the thrown value is a string).

Fetch

import { FetchInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/fetch';

Emits a Span for every HTTP request made using the window.fetch browser API. This instrumentation also propagates the context for distributed traces.

Configuration

new FetchInstrumentation({
  ignoreUrls: ['https://example.com/api'],
  propagateTraceHeaderCorsUrls: [/domain.com\/api.*/],
  measureRequestSize: true,
  applyCustomAttributesOnSpan: (span, request, result) => {
    span.setAttribute('foo', 'bar');
  },
});

Option	Type	Default	Description
`ignoreUrls`	`Array<string \| RegExp>`	—	List of URLs that we do not want its requests instrumented. You can use strings for a single match or regular expressions to match many.
`propagateTraceHeaderCorsUrls`	`Array<string \| RegExp>`	—	List of cross origin URLs to appens trace context headers. You can use strings for a single match or regular expressions to match many.
`measureRequestSize`	`boolean`	—	Set it to `true` to add the request size as a Span attribute.
`sanitizeUrl`	`(url: string) => string`	—	Returns the given URL with sensitive fields `REDACTED`.
`requestHook`	`(span: Span, request: Request) => void`	—	Function that allows you to interact with the Span and the Request object before the request starts.
`applyCustomAttributesOnSpan`	`(span: Span, request: Request, result: Response \| FetchError) => void`	—	Function that allows you to interact with the Span once the request is finished.

Captured Attributes

Each fetch Span includes:

Attribute	Description
`http.request.method`	The method of the request in uppercase (GET, POST, PUT, PATCH, QUERY).
`http.request.method_original`	Original HTTP method sent by the client in the request line..
`url.full`	Absolute URL describing a network resource according to RFC3986 (sanitized if passing `sanitizeUrl` config option).
`server.address`	The hostmane of the request's URL.
`server.port`	The port of the request's URL.
`http.response.status_code`	HTTP response status code.
`error.type`	If request failed. Describes a class of error the operation ended with.

XHR (XmlHttpRequest)

import { XhrInstrumentation } from '@opentelemetry/browser-instrumentation/experimental/xhr';

Emits a Span for every HTTP request made using the window.XmlHttpRequest browser API. This instrumentation also propagates the context for distributed traces.

Configuration

new XhrInstrumentation({
  ignoreUrls: ['https://example.com/api'],
  propagateTraceHeaderCorsUrls: [/domain.com\/api.*/],
  measureRequestSize: true,
  applyCustomAttributesOnSpan: (span, xhr) => {
    span.setAttribute('foo', 'bar');
  },
});

Option	Type	Default	Description
`ignoreUrls`	`Array<string \| RegExp>`	—	List of URLs that we do not want its requests instrumented. You can use strings for a single match or regular expressions to match many.
`propagateTraceHeaderCorsUrls`	`Array<string \| RegExp>`	—	List of cross origin URLs to appens trace context headers. You can use strings for a single match or regular expressions to match many.
`measureRequestSize`	`boolean`	—	Set it to `true` to add the request size as a Span attribute.
`sanitizeUrl`	`(url: string) => string`	—	Returns the given URL with sensitive fields `REDACTED`.
`applyCustomAttributesOnSpan`	`(span: Span, request: Request, result: Response \| FetchError) => void`	—	Function that allows you to interact with the Span once the request is finished.

Captured Attributes

Each fetch Span includes:

Attribute	Description
`http.request.method`	The method of the request in uppercase (GET, POST, PUT, PATCH, QUERY).
`http.request.method_original`	Original HTTP method sent by the client in the request line..
`url.full`	Absolute URL describing a network resource according to RFC3986 (sanitized if passing `sanitizeUrl` config option).
`server.address`	The hostmane of the request's URL.
`server.port`	The port of the request's URL.
`http.response.status_code`	HTTP response status code.
`error.type`	If request failed. Describes a class of error the operation ended with.

Useful links

For more information on OpenTelemetry, visit: https://opentelemetry.io/
For more about OpenTelemetry Browser: https://github.com/open-telemetry/opentelemetry-browser
For help or feedback on this project, join us in GitHub Discussions

License

Apache 2.0 - See LICENSE for more information.

Name		Name	Last commit message	Last commit date
parent directory ..
public		public
src		src
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
package.json		package.json
tsconfig.json		tsconfig.json
tsdown.config.ts		tsdown.config.ts
vitest.config.ts		vitest.config.ts

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README.md

@opentelemetry/browser-instrumentation

Installation

Instrumentations

Usage

Navigation

Configuration

Captured Attributes

Navigation Timing

Resource Timing

Configuration

Captured Data

User Action

Configuration

Additional Attributes

Web Vitals

Configuration

Console

Configuration

Captured Attributes

Errors

Configuration

Captured Attributes

Fetch

Configuration

Captured Attributes

XHR (XmlHttpRequest)

Configuration

Captured Attributes

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README.md

@opentelemetry/browser-instrumentation

Installation

Instrumentations

Usage

Navigation

Configuration

Captured Attributes

Navigation Timing

Resource Timing

Configuration

Captured Data

User Action

Configuration

Additional Attributes

Web Vitals

Configuration

Console

Configuration

Captured Attributes

Errors

Configuration

Captured Attributes

Fetch

Configuration

Captured Attributes

XHR (XmlHttpRequest)

Configuration

Captured Attributes

Useful links

License