Coding⏱️ 3 min read📅 2026-06-03

How to Fix: Subscribe is deprecated: Use an observer instead of an error callback

Use an observer instead of an error callback in Angular.

Quick Answer: Replace subscribe with an observer, e.g. `this.userService.updateUser(data).pipe(tap(() => {bla bla bla}), observer => this.handleUpdateResponse(observer.next(), observer.error()))

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The 'subscribe is deprecated: Use an observer instead of an error callback' error occurs when using the subscribe method on an observable in Angular. This error affects developers who are using Angular and have not updated their code to use the new observer pattern.

This error can be frustrating because it indicates that your code is not compatible with the latest version of Angular. However, by following these steps, you will be able to fix this issue and ensure that your application continues to function correctly.

🛑 Root Causes of the Error

  • The primary reason for this error is that the subscribe method has been deprecated in newer versions of Angular. This means that if you are using an older version of Angular, you may not have access to the latest features and improvements.
  • Another possible cause is that you are trying to use the subscribe method on a pipe, which is not allowed. Pipes are used for data transformation and filtering, but they do not support subscriptions.

🔧 Proven Troubleshooting Steps

Replace subscribe with an observer

  1. Step 1: To fix this issue, you need to replace the subscribe method with an observer. This can be done by using the 'asObservable()' method on your observable.
  2. Step 2: For example, if you have an observable like this: `this.userService.updateUser(data).pipe(tap(() => {bla bla bla})).subscribe(this.handleUpdateResponse.bind(this), this.handleError.bind(this));`
  3. Step 3: You would replace it with: `this.userService.updateUser(data).pipe(tap(() => {bla bla bla})).asObservable().pipe(map((response) => this.handleUpdateResponse(response)), catchError((error) => this.handleError(error)));`

Use a different approach

  1. Step 1: If you are unable to replace the subscribe method with an observer, there may be other approaches you can take. One option is to use a different data handling mechanism, such as a service that handles errors and updates.
  2. Step 2: For example, you could create a service like this: `this.userService.updateUser(data).pipe(tap(() => {bla bla bla})).subscribe(this.handleUpdateResponse.bind(this));`
  3. Step 3: This service would handle the update response and error in a different way. For example, it might throw an error if there is a problem with the update.

🎯 Final Words

By following these steps, you should be able to fix the 'subscribe is deprecated: Use an observer instead of an error callback' error in your Angular application. Remember to always check for updates and use the latest features and improvements to ensure that your code continues to function correctly.

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