Angular session replay 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 API key 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));

3
Watch session recordings
Recommended
Visit your site or app and interact with it for at least 10 seconds to generate a recording. Navigate between pages, click buttons, and fill out forms to capture meaningful interactions.
Watch your first recording →

Next steps

Recommended

Now that you're recording sessions, continue with the resources below to learn what else Session Replay enables within the PostHog platform.

Resource	Description
Watching recordings	How to find and watch session recordings
Privacy controls	How to mask sensitive data in recordings
Network recording	How to capture network requests in recordings
Console log recording	How to capture console logs in recordings
More tutorials	Other real-world examples and use cases

Angular session replay installation

Install the package

Initialize PostHog

Watch session recordings

Next steps

Community questions

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