Coding⏱️ 2 min read📅 2026-05-31

How to Fix: How can I rethrow an exception in Javascript, but preserve the stack?

Re-throwing an exception in JavaScript preserves the stack trace by not catching it again.

Quick Answer: Use a `finally` block instead of `catch` to re-throw the exception without losing its stack trace.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

To preserve the stack trace information when rethrowing an exception in JavaScript, you can use a technique called 'retryable promises' or 'resolvable promises'. This involves creating a promise that resolves to the original exception, rather than just rethrowing it.

🛑 Root Causes of the Error

  • Catching and rethrowing an exception in JavaScript causes the stack trace information up to that point to be lost.

✅ Best Solutions to Fix It

Method 1: Using a Retryable Promise

  1. Step 1: Create a promise that resolves to the original exception using `Promise.reject()` or `new Error(e)`. For example:

Method 2: Using a Resolvable Promise

  1. Step 1: Create a promise that resolves to the original exception using `Promise.resolve(e)` or `new Error(e)`. For example:

🎯 Final Words

By using a retryable promise, you can preserve the stack trace information and allow the exception to continue propagating up the call stack.

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