Angular error tracking installation

Install the package

Required

Install the PostHog JavaScript library using your package manager:

npm install posthog-js
yarn add posthog-js
pnpm add posthog-js

Initialize PostHog

Required

In your src/main.ts, initialize PostHog using your project token and instance address:

For Angular v17 and above, you can set up PostHog as a singleton service. To do this, start by creating and injecting a PosthogService instance.

Create a service by running ng g service services/posthog. The service should look like this:

src/main.ts
// src/app/services/posthog.service.ts
import { DestroyRef, Injectable, NgZone } from "@angular/core";
import posthog from "posthog-js";
import { environment } from "../../environments/environment";
import { Router } from "@angular/router";
@Injectable({ providedIn: "root" })
export class PosthogService {
  constructor(
    private ngZone: NgZone,
    private router: Router,
    private destroyRef: DestroyRef,
  ) {
    this.initPostHog();
  }
  private initPostHog() {
    this.ngZone.runOutsideAngular(() => {
      posthog.init(environment.posthogKey, {
        api_host: environment.posthogHost,
        defaults: '2026-01-30',
      });
    });
  }
}

The service is initialized outside of the Angular zone to reduce change detection cycles. This is important to avoid performance issues with session recording. Then, inject the service in your app's root component app.component.ts. This will make sure PostHog is initialized before any other component is rendered.

src/app/app.component.ts
// src/app/app.component.ts
import { Component } from "@angular/core";
import { RouterOutlet } from "@angular/router";
import { PosthogService } from "./services/posthog.service";
@Component({
  selector: "app-root",
  styleUrls: ["./app.component.scss"],
  template: `
    <router-outlet />`,
  imports: [RouterOutlet],
})
export class AppComponent {
  title = "angular-app";
  constructor(posthogService: PosthogService) {}
}

In your src/main.ts, initialize PostHog using your project API key and instance address. You can find both in your project settings.

src/main.ts
// src/main.ts
import { bootstrapApplication } from '@angular/platform-browser';
import { appConfig } from './app/app.config';
import { AppComponent } from './app/app.component';
import { environment } from "./environments/environment";
import posthog from 'posthog-js'
posthog.init(environment.posthogKey, {
  api_host: environment.posthogHost,
  defaults: '2025-11-30'
})
bootstrapApplication(AppComponent, appConfig)
  .catch((err) => console.error(err));

Send events

Click around and view a couple pages to generate some events. PostHog automatically captures pageviews, clicks, and other interactions for you.

If you'd like, you can also manually capture custom events:

JavaScript
posthog.capture('my_custom_event', { property: 'value' })

Setting up exception autocapture

Recommended

Exception autocapture can be enabled during initialization of the PostHog client to automatically capture any exception thrown by your Angular application.

This requires overriding Angular's default ErrorHandler provider:

src/app/posthog-error-handler.ts
import { ErrorHandler, Injectable, Provider } from '@angular/core';
import { HttpErrorResponse } from '@angular/common/http';
import posthog from 'posthog-js';

@Injectable({ providedIn: 'root' })
class PostHogErrorHandler implements ErrorHandler {
  public constructor() {}
  public handleError(error: unknown): void {
    const extractedError = this._extractError(error) || 'Unknown error';
    runOutsideAngular(() => posthog.captureException(extractedError));
  }
  protected _extractError(errorCandidate: unknown): unknown {
    const error = tryToUnwrapZonejsError(errorCandidate);
    if (error instanceof HttpErrorResponse) {
      return extractHttpModuleError(error);
    }
    if (typeof error === 'string' || isErrorOrErrorLikeObject(error)) {
      return error;
    }
    return null;
  }
}

function tryToUnwrapZonejsError(error: unknown): unknown | Error {
  return error && (error as { ngOriginalError: Error }).ngOriginalError
    ? (error as { ngOriginalError: Error }).ngOriginalError
    : error;
}

function extractHttpModuleError(error: HttpErrorResponse): string | Error {
  if (isErrorOrErrorLikeObject(error.error)) {
    return error.error;
  }
  if (
    typeof ErrorEvent !== 'undefined' &&
    error.error instanceof ErrorEvent &&
    error.error.message
  ) {
    return error.error.message;
  }
  if (typeof error.error === 'string') {
    return `Server returned code ${error.status} with body "${error.error}"`;
  }
  return error.message;
}

function isErrorOrErrorLikeObject(value: unknown): value is Error {
  if (value instanceof Error) {
    return true;
  }
  if (value === null || typeof value !== 'object' || Array.isArray(value)) {
    return false;
  }
  return 'name' in value && 'message' in value && 'stack' in value;
}

declare const Zone: any;
// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
const isNgZoneEnabled = typeof Zone !== 'undefined' && Zone.root?.run;
export function runOutsideAngular<T>(callback: () => T): T {
  // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
  return isNgZoneEnabled ? Zone.root.run(callback) : callback();
}

export function providePostHogErrorHandler(): Provider {
  return {
    provide: ErrorHandler,
    useValue: new PostHogErrorHandler(),
  };
}

Then, in your src/app/app.config.ts, import the providePostHogErrorHandler function and add it to the providers array:

src/app/app.config.ts
// src/app/app.config.ts
import { ApplicationConfig, provideZoneChangeDetection } from '@angular/core';
import { provideRouter } from '@angular/router';

import { routes } from './app.routes';
import { providePostHogErrorHandler } from './posthog-error-handler'; 
export const appConfig: ApplicationConfig = {
  providers: [
    ...
    providePostHogErrorHandler(), 
  ],
};

Manually capture exceptions

Optional

If there are more errors you'd like to capture, you can manually call the captureException method:

TypeScript
posthog.captureException(e, additionalProperties)

Verify error tracking
Recommended
Confirm events are being sent to PostHog
Before proceeding, let's make sure exception events are being captured and sent to PostHog. You should see events appear in the activity feed.
Check for exceptions in PostHog
6
Upload source maps
Required
Great, you're capturing exceptions! If you serve minified bundles, the next step is to upload source maps to generate accurate stack traces.
Let's continue to the next section.
Upload source maps

Angular error tracking installation

Install the package

Initialize PostHog

Send events

Setting up exception autocapture

Manually capture exceptions

Verify error tracking

Upload source maps

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