Browser Log Collection

Send logs to Datadog from web browser pages with the browser logs SDK.

With the browser logs SDK, you can send logs directly to Datadog from web browser pages and leverage the following features:

  • Use the SDK as a logger. Everything is forwarded to Datadog as JSON documents.
  • Add context and extra custom attributes to each log sent.
  • Wrap and forward every frontend error automatically.
  • Forward frontend errors.
  • Record real client IP addresses and user agents.
  • Optimized network usage with automatic bulk posts.

Setup

Datadog client token: For security reasons, API keys cannot be used to configure the browser logs SDK, because they would be exposed client-side in the JavaScript code. To collect logs from web browsers, a client token must be used. See the client token documentation for more details.

Datadog browser logs SDK: Configure the SDK through NPM or use the CDN async or CDN sync code snippets in the head tag.

Supported browsers: The browser logs SDK supports all modern desktop and mobile browsers including IE11. See the browser support table.

Choose the right installation method

Installation methodUse case
npm (node package manager)This method is recommended for modern web applications. The browser logs SDK gets packaged with the rest of your front-end javascript code. It has no impact on page load performance. However, the SDK might miss errors, resources and user actions triggered before the SDK is initialized. Note: it is recommended to use a matching version with RUM SDK if used.
CDN asyncThis method is recommended for web applications with performance targets. The browser logs SDK is loaded from our CDN asynchronously: this method ensures the SDK download does not impact page load performance. However, the SDK might miss errors, resources and user actions triggered before the SDK is initialized.
CDN syncThis method is recommended for collecting all RUM events. The browser logs SDK is loaded from our CDN synchronously: this method ensures the SDK is loaded first and collects all errors, resources and user actions. This method might impact page load performance.

NPM

After adding @datadog/browser-logs to your package.json file, initialize it with:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.init({
  clientToken: '<DATADOG_CLIENT_TOKEN>',
  site: '<DATADOG_SITE>',
  forwardErrorsToLogs: true,
  sessionSampleRate: 100,
})

CDN async

Load and configure the SDK in the head section of your pages. For site:

<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/us1/v5/datadog-logs.js','DD_LOGS')
      window.DD_LOGS.onReady(function() {
          window.DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'datadoghq.com',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/ap1/v5/datadog-logs.js','DD_LOGS')
      DD_LOGS.onReady(function() {
          DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'ap1.datadoghq.com',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/eu1/v5/datadog-logs.js','DD_LOGS')
      window.DD_LOGS.onReady(function() {
          window.DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'datadoghq.eu',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/us3/v5/datadog-logs.js','DD_LOGS')
      window.DD_LOGS.onReady(function() {
          window.DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'us3.datadoghq.com',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/us5/v5/datadog-logs.js','DD_LOGS')
      window.DD_LOGS.onReady(function() {
          window.DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'us5.datadoghq.com',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
      <script>
      (function(h,o,u,n,d) {
        h=h[d]=h[d]||{q:[],onReady:function(c){h.q.push(c)}}
        d=o.createElement(u);d.async=1;d.src=n
        n=o.getElementsByTagName(u)[0];n.parentNode.insertBefore(d,n)
      })(window,document,'script','https://www.datadoghq-browser-agent.com/datadog-logs-v5.js','DD_LOGS')
      window.DD_LOGS.onReady(function() {
          window.DD_LOGS.init({
            clientToken: '<DATADOG_CLIENT_TOKEN>',
            site: 'ddog-gov.com',
            forwardErrorsToLogs: true,
            sessionSampleRate: 100,
          })
        })
      </script>
  </head>
</html>

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

To receive all logs and errors, load and configure the SDK at the beginning of the head section for your pages. For site:

<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/us1/v5/datadog-logs.js"></script>
    <script>
      window.DD_LOGS &&
        window.DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'datadoghq.com',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/ap1/v5/datadog-logs.js"></script>
    <script>
      window.DD_LOGS &&
        DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'ap1.datadoghq.com',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/eu1/v5/datadog-logs.js"></script>
    <script>
      window.DD_LOGS &&
        window.DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'datadoghq.eu',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/us3/v5/datadog-logs.js"></script>
    <script>
      window.DD_LOGS &&
        window.DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'us3.datadoghq.com',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/us5/v5/datadog-logs.js"></script>
    <script>
      window.DD_LOGS &&
        window.DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'us5.datadoghq.com',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>


<html>
  <head>
    <title>Example to send logs to Datadog</title>
    <script type="text/javascript" src="https://www.datadoghq-browser-agent.com/datadog-logs-v5.js"></script>
    <script>
      window.DD_LOGS &&
        window.DD_LOGS.init({
          clientToken: '<DATADOG_CLIENT_TOKEN>',
          site: 'ddog-gov.com',
          forwardErrorsToLogs: true,
          sessionSampleRate: 100,
        })
    </script>
  </head>
</html>

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

TypeScript

Types are compatible with TypeScript >= 3.8.2. For earlier versions, import JS sources and use global variables to avoid any compilation issues:

import '@datadog/browser-logs/bundle/datadog-logs'

window.DD_LOGS.init({
  clientToken: '<CLIENT_TOKEN>',
  site: '<DATADOG_SITE>',
  forwardErrorsToLogs: true,
  sessionSampleRate: 100,
})

Configuration

Content Security Policy integration

If you’re using the Datadog Content Security Policy (CSP) integration on your site, see the RUM section of the CSP documentation for configuration steps.

Initialization parameters

The following parameters are available to configure the Datadog browser logs SDK to send logs to Datadog:

ParameterTypeRequiredDefaultDescription
clientTokenStringYesA Datadog client token.
siteStringYesdatadoghq.comThe Datadog site parameter of your organization.
serviceStringNoThe service name for your application. It should follow the tag syntax requirements.
envStringNoThe application’s environment, for example: prod, pre-prod, staging, and so on. It should follow the tag syntax requirements.
versionStringNoThe application’s version, for example: 1.2.3, 6c44da20, 2020.02.13, and so on. It should follow the tag syntax requirements.
forwardErrorsToLogsBooleanNotrueSet to false to stop forwarding console.error logs, uncaught exceptions and network errors to Datadog.
forwardConsoleLogs"all" or an Array of "log" "debug" "info" "warn" "error"No[]Forward logs from console.* to Datadog. Use "all" to forward everything or an array of console API names to forward only a subset.
forwardReports"all" or an Array of "intervention" "deprecation" "csp_violation"No[]Forward reports from the Reporting API to Datadog. Use "all" to forward everything or an array of report types to forward only a subset.
sampleRateNumberNo100Deprecated - see sessionSampleRate.
sessionSampleRateNumberNo100The percentage of sessions to track: 100 for all, 0 for none. Only tracked sessions send logs.
trackingConsent"granted" or "not-granted"No"granted"Set the initial user tracking consent state. See User Tracking Consent.
silentMultipleInitBooleanNoPrevent logging errors while having multiple init.
proxyStringNoOptional proxy URL (ex: https://www.proxy.com/path), see the full proxy setup guide for more information.
telemetrySampleRateNumberNo20Telemetry data (error, debug logs) about SDK execution is sent to Datadog in order to detect and solve potential issues. Set this option to 0 to opt out from telemetry collection.
storeContextsAcrossPagesBooleanNoStore global context and user context in localStorage to preserve them along the user navigation. See Contexts life cycle for more details and specific limitations.
allowUntrustedEventsBooleanNoAllow capture of untrusted events, for example in automated UI tests.
sendLogsAfterSessionExpirationBooleanNoKeep sending logs after the session expires.

Options that must have a matching configuration when using the RUM SDK:

ParameterTypeRequiredDefaultDescription
trackSessionAcrossSubdomainsBooleanNofalsePreserve the session across subdomains for the same site.
useSecureSessionCookieBooleanNofalseUse a secure session cookie. This disables logs sent on insecure (non-HTTPS) connections.
usePartitionedCrossSiteSessionCookieBooleanNofalseUse a partitioned secure cross-site session cookie. This allows the logs SDK to run when the site is loaded from another one (iframe). Implies useSecureSessionCookie.
useCrossSiteSessionCookieBooleanNofalseDeprecated, see usePartitionedCrossSiteSessionCookie.

Usage

Custom logs

After the Datadog browser logs SDK is initialized, send a custom log entry directly to Datadog with the API:

logger.debug | info | warn | error (message: string, messageContext?: Context, error?: Error)

NPM

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.logger.info('Button clicked', { name: 'buttonName', id: 123 })

CDN async

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.logger.info('Button clicked', { name: 'buttonName', id: 123 })
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

window.DD_LOGS && window.DD_LOGS.logger.info('Button clicked', { name: 'buttonName', id: 123 })

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Results

The results are the same when using NPM, CDN async, or CDN sync:

{
  "status": "info",
  "session_id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "name": "buttonName",
  "id": 123,
  "message": "Button clicked",
  "date": 1234567890000,
  "origin": "logger",
  "http": {
    "useragent": "Mozilla/5.0 ...",
  },
  "view": {
    "url": "https://...",
    "referrer": "https://...",
  },
  "network": {
    "client": {
      "geoip": {...}
      "ip": "xxx.xxx.xxx.xxx"
    }
  }
}

The Logs SDK adds the following information by default (more fields can be added if the RUM SDK is present):

  • date
  • view.url
  • view.referrer
  • session_id (only if a session is used)

The Datadog backend adds more fields, like:

  • http.useragent
  • network.client.ip

Error tracking

The Datadog browser logs SDK allows for manual error tracking by using the optional error parameter (Available in SDK v4.36.0+). When an instance of a JavaScript Error is provided, the SDK extracts relevant information (kind, message, stack trace) from the error.

logger.debug | info | warn | error (message: string, messageContext?: Context, error?: Error)

NPM

import { datadogLogs } from '@datadog/browser-logs'

try {
  ...
  throw new Error('Wrong behavior')
  ...
} catch (ex) {
  datadogLogs.logger.error('Error occurred', {}, ex)
}

CDN async

try {
  ...
  throw new Error('Wrong behavior')
  ...
} catch (ex) {
  window.DD_LOGS.onReady(function () {
    window.DD_LOGS.logger.error('Error occurred', {}, ex)
  })
}

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

try {
  ...
  throw new Error('Wrong behavior')
  ...
} catch (ex) {
    window.DD_LOGS && window.DD_LOGS.logger.error('Error occurred', {}, ex)
}

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Results

The results are the same when using NPM, CDN async, or CDN sync:

{
  "status": "error",
  "session_id": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
  "message": "Error occurred",
  "date": 1234567890000,
  "origin": "logger",
  "error" : {
    "message": "Wrong behavior",
    "kind" : "Error",
    "stack" : "Error: Wrong behavior at <anonymous> @ <anonymous>:1:1"
  },
  ...
}

Generic logger function

The Datadog browser logs SDK adds shorthand functions (.debug, .info, .warn, .error) to the loggers for convenience. A generic logger function is also available, exposing the status parameter:

log (message: string, messageContext?: Context, status? = 'debug' | 'info' | 'warn' | 'error', error?: Error)

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs';

datadogLogs.logger.log(<MESSAGE>,<JSON_ATTRIBUTES>,<STATUS>,<ERROR>);

CDN async

For CDN async, use:

window.DD_LOGS.onReady(function() {
  window.DD_LOGS.logger.log(<MESSAGE>,<JSON_ATTRIBUTES>,<STATUS>,<ERROR>);
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.logger.log(<MESSAGE>,<JSON_ATTRIBUTES>,<STATUS>,<ERROR>);

Placeholders

The placeholders in the examples above are described below:

PlaceholderDescription
<MESSAGE>The message of your log that is fully indexed by Datadog.
<JSON_ATTRIBUTES>A valid JSON object, which includes all attributes attached to the <MESSAGE>.
<STATUS>The status of your log; accepted status values are debug, info, warn, or error.
<ERROR>An instance of a JavaScript Error object.

Advanced usage

Scrub sensitive data from your Browser logs

If your Browser logs contain sensitive information that needs redacting, configure the Browser SDK to scrub sensitive sequences by using the beforeSend callback when you initialize the Browser Log Collector.

The beforeSend callback function gives you access to each log collected by the Browser SDK before it is sent to Datadog, and lets you update any property.

To redact email addresses from your web application URLs:

NPM

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.init({
    ...,
    beforeSend: (log) => {
        // remove email from view url
        log.view.url = log.view.url.replace(/email=[^&]*/, "email=REDACTED")
    },
    ...
});

CDN Async

window.DD_LOGS.onReady(function() {
    window.DD_LOGS.init({
        ...,
        beforeSend: (log) => {
            // remove email from view url
            log.view.url = log.view.url.replace(/email=[^&]*/, "email=REDACTED")
        },
        ...
    })
})

CDN Sync

window.DD_LOGS &&
    window.DD_LOGS.init({
        ...,
        beforeSend: (log) => {
            // remove email from view url
            log.view.url = log.view.url.replace(/email=[^&]*/, "email=REDACTED")
        },
        ...
    });

The following properties are automatically collected by the SDK and could contain sensitive data:

AttributeTypeDescription
view.urlStringThe URL of the active web page.
view.referrerStringThe URL of the previous web page from which a link to the currently requested page was followed.
messageStringThe content of the log.
error.stackStringThe stack trace or complementary information about the error.
http.urlStringThe HTTP URL.

Discard specific logs

The beforeSend callback function allows you to also discard a log before it is sent to Datadog.

To discard network errors if their status is 404:

NPM

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.init({
    ...,
    beforeSend: (log) => {
        // discard 404 network errors
        if (log.http && log.http.status_code === 404) {
          return false
        }
    },
    ...
});

CDN Async

window.DD_LOGS.onReady(function() {
    window.DD_LOGS.init({
        ...,
        beforeSend: (log) => {
          // discard 404 network errors
          if (log.http && log.http.status_code === 404) {
            return false
          }
        },
        ...
    })
})

CDN Sync

window.DD_LOGS &&
    window.DD_LOGS.init({
        ...,
        beforeSend: (log) => {
          // discard 404 network errors
          if (log.http && log.http.status_code === 404) {
            return false
          }
        },
        ...
    });

Define multiple loggers

The Datadog browser logs SDK contains a default logger, but it is possible to define different loggers.

Create a new logger

After the Datadog browser logs SDK is initialized, use the API createLogger to define a new logger:

createLogger (name: string, conf?: {
    level?: 'debug' | 'info' | 'warn' | 'error',
    handler?: 'http' | 'console' | 'silent',
    context?: Context
})

Note: These parameters can be set with the setLevel, setHandler, and setContext APIs.

Get a custom logger

After the creation of a logger, access it in any part of your JavaScript code with the API:

getLogger(name: string)
NPM

For example, assume there is a signupLogger, defined with all the other loggers:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.createLogger('signupLogger', {
  level: 'info',
  handler: 'http',
  context: { env: 'staging' }
})

It can then be used in a different part of the code with:

import { datadogLogs } from '@datadog/browser-logs'

const signupLogger = datadogLogs.getLogger('signupLogger')
signupLogger.info('Test sign up completed')
CDN async

For example, assume there is a signupLogger, defined with all the other loggers:

window.DD_LOGS.onReady(function () {
  const signupLogger = window.DD_LOGS.createLogger('signupLogger', {
    level: 'info',
    handler: 'http',
    context: { env: 'staging' }
  })
})

It can then be used in a different part of the code with:

window.DD_LOGS.onReady(function () {
  const signupLogger = window.DD_LOGS.getLogger('signupLogger')
  signupLogger.info('Test sign up completed')
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For example, assume there is a signupLogger, defined with all the other loggers:

if (window.DD_LOGS) {
  const signupLogger = window.DD_LOGS.createLogger('signupLogger', {
    level: 'info',
    handler: 'http',
    context: { env: 'staging' }
  })
}

It can then be used in a different part of the code with:

if (window.DD_LOGS) {
  const signupLogger = window.DD_LOGS.getLogger('signupLogger')
  signupLogger.info('Test sign up completed')
}

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Overwrite context

Global context

After the Datadog browser logs SDK is initialized, it is possible to:

  • Set the entire context for all your loggers with the setGlobalContext (context: object) API.
  • Add a context to all your loggers with the setGlobalContextProperty (key: string, value: any) API.
  • Get the entire global context with the getGlobalContext () API.
  • Remove context property with the removeGlobalContextProperty (key: string) API.
  • Clear all existing context properties with the clearGlobalContext () API.

The Log Browser SDK v4.17.0 has updated the names of several APIs:

  • getGlobalContext instead of getLoggerGlobalContext
  • setGlobalContext instead of setLoggerGlobalContext
  • setGlobalContextProperty instead of addLoggerGlobalContext
  • removeGlobalContextProperty instead of removeLoggerGlobalContext
NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.setGlobalContext({ env: 'staging' })

datadogLogs.setGlobalContextProperty('referrer', document.referrer)

datadogLogs.getGlobalContext() // => {env: 'staging', referrer: ...}

datadogLogs.removeGlobalContextProperty('referrer')

datadogLogs.getGlobalContext() // => {env: 'staging'}

datadogLogs.clearGlobalContext()

datadogLogs.getGlobalContext() // => {}
CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setGlobalContext({ env: 'staging' })
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setGlobalContextProperty('referrer', document.referrer)
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getGlobalContext() // => {env: 'staging', referrer: ...}
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.removeGlobalContextProperty('referrer')
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getGlobalContext() // => {env: 'staging'}
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.clearGlobalContext()
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getGlobalContext() // => {}
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.setGlobalContext({ env: 'staging' })

window.DD_LOGS && window.DD_LOGS.setGlobalContextProperty('referrer', document.referrer)

window.DD_LOGS && window.DD_LOGS.getGlobalContext() // => {env: 'staging', referrer: ...}

window.DD_LOGS && window.DD_LOGS.removeGlobalContextProperty('referrer')

window.DD_LOGS && window.DD_LOGS.getGlobalContext() // => {env: 'staging'}

window.DD_LOGS && window.DD_LOGS.clearGlobalContext()

window.DD_LOGS && window.DD_LOGS.getGlobalContext() // => {}

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

User context

The Datadog logs SDK provides convenient functions to associate a User with generated logs.

  • Set the user for all your loggers with the setUser (newUser: User) API.
  • Add or modify a user property to all your loggers with the setUserProperty (key: string, value: any) API.
  • Get the currently stored user with the getUser () API.
  • Remove a user property with the removeUserProperty (key: string) API.
  • Clear all existing user properties with the clearUser () API.

Note: The user context is applied before the global context. Hence, every user property included in the global context will override the user context when generating logs.

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.setUser({ id: '1234', name: 'John Doe', email: 'john@doe.com' })
datadogLogs.setUserProperty('type', 'customer')
datadogLogs.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com', type: 'customer'}

datadogLogs.removeUserProperty('type')
datadogLogs.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com'}

datadogLogs.clearUser()
datadogLogs.getUser() // => {}
CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setUser({ id: '1234', name: 'John Doe', email: 'john@doe.com' })
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setUserProperty('type', 'customer')
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com', type: 'customer'}
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.removeUserProperty('type')
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com'}
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.clearUser()
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getUser() // => {}
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.setUser({ id: '1234', name: 'John Doe', email: 'john@doe.com' })

window.DD_LOGS && window.DD_LOGS.setUserProperty('type', 'customer')

window.DD_LOGS && window.DD_LOGS.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com', type: 'customer'}

window.DD_LOGS && window.DD_LOGS.removeUserProperty('type')

window.DD_LOGS && window.DD_LOGS.getUser() // => {id: '1234', name: 'John Doe', email: 'john@doe.com'}

window.DD_LOGS && window.DD_LOGS.clearUser()

window.DD_LOGS && window.DD_LOGS.getUser() // => {}

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Contexts life cycle

By default, global context and user context are stored in the current page memory, which means they are not:

  • kept after a full reload of the page
  • shared across different tabs or windows of the same session

To add them to all events of the session, they must be attached to every page.

With the introduction of the storeContextsAcrossPages configuration option in the v4.49.0 of the browser SDK, those contexts can be stored in localStorage, allowing the following behaviors:

  • Contexts are preserved after a full reload
  • Contexts are synchronized between tabs opened on the same origin

However, this feature comes with some limitations:

  • Setting Personable Identifiable Information (PII) in those contexts is not recommended, as data stored in localStorage outlives the user session
  • The feature is incompatible with the trackSessionAcrossSubdomains options because localStorage data is only shared among the same origin (login.site.com ≠ app.site.com)
  • localStorage is limited to 5 MiB by origin, so the application-specific data, Datadog contexts, and other third-party data stored in localStorage must be within this limit to avoid any issues

Logger context

After a logger is created, it is possible to:

  • Set the entire context for your logger with the setContext (context: object) API.
  • Set a context property on your logger with setContextProperty (key: string, value: any) API:
NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.setContext("{'env': 'staging'}")

datadogLogs.setContextProperty('referrer', document.referrer)
CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setContext("{'env': 'staging'}")
})

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.setContextProperty('referrer', document.referrer)
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.setContext("{'env': 'staging'}")

window.DD_LOGS && window.DD_LOGS.setContextProperty('referrer', document.referrer)

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Filter by status

After the Datadog browser logs SDK is initialized, the minimal log level for your logger is set with the API:

setLevel (level?: 'debug' | 'info' | 'warn' | 'error')

Only logs with a status equal to or higher than the specified level are sent.

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.logger.setLevel('<LEVEL>')

CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.logger.setLevel('<LEVEL>')
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.logger.setLevel('<LEVEL>')

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

Change the destination

By default, loggers created by the Datadog browser logs SDK are sending logs to Datadog. After the Datadog browser logs SDK is initialized, it is possible to configure the logger to:

  • send logs to the console and Datadog (http)
  • send logs to the console only
  • not send logs at all (silent)
setHandler (handler?: 'http' | 'console' | 'silent' | Array<handler>)

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.logger.setHandler('<HANDLER>')
datadogLogs.logger.setHandler(['<HANDLER1>', '<HANDLER2>'])

CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.logger.setHandler('<HANDLER>')
  window.DD_LOGS.logger.setHandler(['<HANDLER1>', '<HANDLER2>'])
})

Note: Early API calls must be wrapped in the window.DD_LOGS.onReady() callback. This ensures the code only gets executed once the SDK is properly loaded.

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.logger.setHandler('<HANDLER>')
window.DD_LOGS && window.DD_LOGS.logger.setHandler(['<HANDLER1>', '<HANDLER2>'])

Note: The window.DD_LOGS check prevents issues when a loading failure occurs with the SDK.

To be compliant with GDPR, CCPA and similar regulations, the Logs Browser SDK lets you provide the tracking consent value at initialization.

The trackingConsent initialization parameter can be one of the following values:

  1. "granted": The Logs Browser SDK starts collecting data and sends it to Datadog.
  2. "not-granted": The Logs Browser SDK does not collect any data.

To change the tracking consent value after the Logs Browser SDK is initialized, use the setTrackingConsent() API call. The Logs Browser SDK changes its behavior according to the new value:

  • when changed from "granted" to "not-granted", the Logs session is stopped, and data is no longer sent to Datadog.
  • when changed from "not-granted" to "granted", a new Logs session is created if no previous session is active, and data collection resumes.

This state is not synchronized between tabs nor persisted between navigation. It is your responsibility to provide the user decision during Logs Browser SDK initialization or by using setTrackingConsent().

When setTrackingConsent() is used before init(), the provided value takes precedence over the initialization parameter.

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs';

datadogLogs.init({
    ...,
    trackingConsent: 'not-granted'
});

acceptCookieBannerButton.addEventListener('click', function() {
    datadogLogs.setTrackingConsent('granted');
});

CDN async

For CDN async, use:

window.DD_LOGS.onReady(function() {
    window.DD_LOGS.init({
        ...,
        trackingConsent: 'not-granted'
    });
});

acceptCookieBannerButton.addEventListener('click', () => {
    window.DD_LOGS.onReady(function() {
        window.DD_LOGS.setTrackingConsent('granted');
    });
});

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.init({
  ...,
  trackingConsent: 'not-granted'
});

acceptCookieBannerButton.addEventListener('click', () => {
    window.DD_LOGS && window.DD_LOGS.setTrackingConsent('granted');
});

Access internal context

After the Datadog browser logs SDK is initialized, you can access the internal context of the SDK. This allows you to access the session_id.

getInternalContext (startTime?: 'number' | undefined)

You can optionally use startTime parameter to get the context of a specific time. If the parameter is omitted, the current context is returned.

NPM

For NPM, use:

import { datadogLogs } from '@datadog/browser-logs'

datadogLogs.getInternalContext() // { session_id: "xxxx-xxxx-xxxx-xxxx" }

CDN async

For CDN async, use:

window.DD_LOGS.onReady(function () {
  window.DD_LOGS.getInternalContext() // { session_id: "xxxx-xxxx-xxxx-xxxx" }
})

CDN sync

For CDN sync, use:

window.DD_LOGS && window.DD_LOGS.getInternalContext() // { session_id: "xxxx-xxxx-xxxx-xxxx" }
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