Apache SkyWalking Client JS

Apache SkyWalking Client-side JavaScript exception and tracing library.

• Provide metrics and error collection to SkyWalking backend.
• Lightweight
• Make browser as a start of whole distributed tracing

NOTICE, SkyWalking Client JS 0.8.0 and later versions require SkyWalking v9.

Usage

Install

The skywalking-client-js runtime library is available at npm.

npm install skywalking-client-js --save

Quick Start

skywalking-client-js requires SkyWalking 8.2+

User could use register method to load and report data automatically.

import ClientMonitor from 'skywalking-client-js';

// Report collected data to `http:// + window.location.host + /browser/perfData` in default
ClientMonitor.register({
  # Use core/default/restPort in the OAP server.
  # If External Communication Channels are activated, `receiver-sharing-server/default/restPort`,
  # ref to https://skywalking.apache.org/docs/main/latest/en/setup/backend/backend-expose/
  collector: 'http://127.0.0.1:12800', 
  service: 'test-ui',
  pagePath: '/current/page/name',
  serviceVersion: 'v1.0.0',
});

Parameters

The register method supports the following parameters.

Collect Metrics Manually

Use the setPerformance method to report metrics at the moment of page loaded or any other moment meaningful.

1. Set the SDK configuration item autoTracePerf to false to turn off automatic reporting performance metrics and wait for manual triggering of escalation.
2. Call ClientMonitor.setPerformance(object) method to report

• Examples

import ClientMonitor from 'skywalking-client-js';

ClientMonitor.setPerformance({
  collector: 'http://127.0.0.1:12800',
  service: 'browser-app',
  serviceVersion: '1.0.0',
  pagePath: location.href,
  useFmp: true
});

Special scene

SPA Page

In spa (single page application) single page application, the page will be refreshed only once. The traditional method only reports PV once after the page loading, but cannot count the PV of each sub-page, and can't make other types of logs aggregate by sub-page.
The SDK provides two processing methods for spa pages:

1. Enable spa automatic parsing
   This method is suitable for most single page application scenarios with URL hash as the route.
   In the initialized configuration item, set enableSPA to true, which will turn on the page's hashchange event listening (trigger re reporting PV), and use URL hash as the page field in other data reporting.
2. Manual reporting
   This method can be used in all single page application scenarios. This method can be used if the first method is invalid.
   The SDK provides a set page method to manually update the page name when data is reported. When this method is called, the page PV will be re reported by default. For details, see setPerformance().

app.on('routeChange', function (next) {
  ClientMonitor.setPerformance({
    collector: 'http://127.0.0.1:12800',
    service: 'browser-app',
    serviceVersion: '1.0.0',
    pagePath: location.href,
    useFmp: true
  });
});   

Tracing range of data requests in the browser

Support tracking these(XMLHttpRequest and Fetch API) two modes of data requests. At the same time, Support tracking libraries and tools that base on XMLHttpRequest and fetch, such as Axios, SuperAgent, OpenApi and so on.

Catching errors in frames, including React, Angular, Vue.

// Angular
import { ErrorHandler } from '@angular/core';
import ClientMonitor from 'skywalking-client-js';
export class AppGlobalErrorhandler implements ErrorHandler {
  handleError(error) {
    ClientMonitor.reportFrameErrors({
      collector: 'http://127.0.0.1:12800',
      service: 'angular-demo',
      pagePath: '/app',
      serviceVersion: 'v1.0.0',
    }, error);
  }
}
@NgModule({
  ...
  providers: [{provide: ErrorHandler, useClass: AppGlobalErrorhandler}]
})
class AppModule {}

// React
class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError(error) {
    // Update state so the next render will show the fallback UI.
    return { hasError: true };
  }

  componentDidCatch(error, errorInfo) {
    // You can also log the error to an error reporting service
    ClientMonitor.reportFrameErrors({
      collector: 'http://127.0.0.1:12800',
      service: 'react-demo',
      pagePath: '/app',
      serviceVersion: 'v1.0.0',
    }, error);
  }

  render() {
    if (this.state.hasError) {
      // You can render any custom fallback UI
      return <h1>Something went wrong.</h1>;
    }

    return this.props.children; 
  }
}
<ErrorBoundary>
  <MyWidget />
</ErrorBoundary>

// Vue
Vue.config.errorHandler = (error) => {
  ClientMonitor.reportFrameErrors({
    collector: 'http://127.0.0.1:12800',
    service: 'vue-demo',
    pagePath: '/app',
    serviceVersion: 'v1.0.0',
  }, error);
}

Demo project

Demo project provides instrumented web application with necessary environment, you could just simple use it to see the data SkyWalking collected and how SkyWalking visualizes on the UI. See more information, click here.

Contact Us

• Submit an issue
• Mail list: [email protected]. Mail to [email protected], follow the reply to subscribe the mail list.
• Join #skywalking channel at Apache Slack. If the linke is not working, find the latest one at Apache INFRA WIKI.
• QQ Group: 392443393, 901167865

Release Guide

All committers should follow Release Guide to publish the official release.

License

Apache 2.0