Coding⏱️ 3 min read📅 2026-06-03

How to Fix: Why am I getting an error "Object literal may only specify known properties"?

TypeScript error fix

Quick Answer: The issue is due to a typo in the property name. Change 'callbackOnLoactionHash' to 'callbackOnLocationHash'.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🚀 How to Resolve This Issue
  3. 🎯 Final Words

Error: Object literal may only specify known properties, and 'callbackOnLoactionHash'does not exist in type 'Options'. This error occurs when you're trying to create an object with unknown properties using TypeScript. It affects developers who use interfaces to define the structure of objects and then try to create instances of those objects using literal syntax.

This can be frustrating because it's easy to overlook or misinterpret the error message, especially if you're new to TypeScript. However, the solution is straightforward once you understand what's causing the issue.

🛑 Root Causes of the Error

  • The primary reason for this error is that TypeScript has become more strict about type checking since version 1.5. The 'callbackOnLoactionHash' property was not defined in the original interface, which means it's not a valid option when creating an object using literal syntax.
  • In alternative universes where the typo exists, the issue could be due to a simple typo or a misunderstanding of TypeScript's type system.

🚀 How to Resolve This Issue

Fixing the Error by Correcting Interface Properties

  1. Step 1: Open your project in your preferred code editor and navigate to the interface definition where 'callbackOnLoactionHash' is declared.
  2. Step 2: Review the properties of the Options interface to ensure that it includes all the expected properties. If necessary, add the missing property or correct any typos.
  3. Step 3: Save the changes to the interface file and then re-compile your project to test if the error has been resolved.

Fixing the Error by Using Property Names Correctly

  1. Step 1: Review your code snippets where objects are created using literal syntax.
  2. Step 2: Check that all property names used in these instances match those defined in the Options interface. If a typo exists, correct it and re-compile your project as needed.
  3. Step 3: Use a tool like TypeScript's type checking or an IDE with built-in type checking to help identify potential issues before they cause compilation errors.

🎯 Final Words

To resolve the 'Object literal may only specify known properties' error in TypeScript, you can either correct any typos in your interface properties or use property names correctly when creating objects using literal syntax. By following these steps and being mindful of TypeScript's type checking, you can ensure that your code is accurate and reliable.

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