femonitor-web ·

A SDK for web error and performance monitor wrote on typescript.

Screenshot

Example

Online example: http://monitor.huzerui.com

Open chrome developer tool to see console information

Feature

• [x] Error observe, includes js error, unhandle rejection error, http error and resource error
• [x] Error sampling, support errors collection emit events for report optimization
• [x] Observe page performance
• [x] Observe user behaviors, includes console, user click event
• [x] Integrate rrweb
• [x] Hack spa router change
• [x] Auto report error events by config

Development

npm run watch  // Watch tsfile change and compile by rollup
npm run server // Start a nodejs test server

Then visit localhost:3000 for example test

Build

npm run build

Test

npm run test

Installation

CDN

<script src="https://cdn.jsdelivr.net/npm/femonitor-web@1.4.3/dist/index.min.js"></script>

NPM

npm i femonitor-web -S

Usage

Minimal options

import { Monitor } from "femonitor-web";
const monitor = Monitor.init();
/* Listen single event */
monitor.on([event], (emitData) => {
  // Do report
  // ...
});
/* Or listen some events by pass Array, eg: only listen error events */
monitor.on(
  ["jsError", "unhandleRejection", "resourceError", "vuejsError", "reqError"],
  (eventName, emitData) => {
    // Do report
    // ...
  }
);
/* Or Listen all events, not recommend */
monitor.on("event", (eventName, emitData) => {
  // Do report
  // ...
});

Full options

// Default full options
export const defaultTrackerOptions = {
  env: "dev",
  // Auto report config, only error events(jsError, unHandleRejection, resourceError, reqError, vuejsError) take effect
  report: {
    url: "",  // Report url, set a correct reportUrl to open autoReport switch
    method: "POST",
    contentType: "application/json",
    beforeSend: (data) => data  // Decorate report data before request send, support decorate or return object to overrite
  },
  data: {},
  error: {
    watch: true, // If listen all error
    random: 1, // Sampling rate from 0 to 1, 1 means emit all error
    repeat: 5, // 5 means don't emit sample error events when exceed 5 times. Be careful to set large number because if your report handler cause error, it would probably cause js dead cycle
    delay: 1000 // Delay emit event after 1000 ms
  },
  performance: false, // If want to collect performance data
  http: {
    fetch: true, // If listen request use fetch interface
    ajax: true, // If listen ajax request
    ignoreRules: [] // If request url match rules, interceptor won't emit events. Support string and regexp
  },
  behavior: {
    watch: false,
    console: [ConsoleType.error],
    click: true, // If set to true will listen all dom click event
    queueLimit: 20 // Limit behavior queue to 20
  },
  /**
   * rrweb use mutation observer api, for compatibility see:
   * https://caniuse.com/mutationobserver
   */
  rrweb: {
    watch: false,
    queueLimit: 50, // Limit rrweb queue to 20
    delay: 1000 // Emit event after 1000 ms
  },
  isSpa: true // If watch is true, globalData would add _spaUrl property when route change
};
const monitor = Monitor.init(defaultTrackerOptions);

Vue project

Sdk support Vue.config.errorHandler to handle error for get detail component info. You just need to call useVueErrorListener before create Vue instance.

monitor.useVueErrorListener(Vue)

React project

React supply a hook called componentDidCatch for error listen and concept called ErrorBoundary which is enabled to catch errors at top and prevent app to shutdown. You can report it by yourself like below.

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

  componentDidCatch(error, info) {
    this.setState({ hasError: true });
    reportError(error, info);
  }

  render() {
    if (this.state.hasError) {
      return <h1>Something went wrong.</h1>;
    }
    return this.props.children;
  }
}

Support events

EventName	Description
jsError	winodw.onerror
vuejsError	Vue.config.errorHandler
unhandleRejection	window.onunhandledrejection
resourceError	Resource request error
reqError	Network request error
batchErrors	Batch collection of error events, includes 'jsError', 'vuejsError', 'unHandleRejection', 'resourceError' and 'reqError' , trigger every specified time interval
reqStart	Network request start
reqEnd	Network request end
performanceInfoReady	Performance data is ready
event	Includes all events above