❌ 424 Failed Dependency

? Quick Overview

The 424 Failed Dependency HTTP status code indicates that a request failed because it relied on another request or operation that did not succeed. It is commonly used in APIs and WebDAV-based systems where actions depend on prior steps.

? Key Concepts

• The request itself is valid
• A dependent operation failed earlier
• Often seen in chained or transactional APIs
• Client must fix the earlier failure first

? Syntax / Theory

The server returns status code 424 when it cannot complete the current request due to a failed dependency. This status helps avoid partial updates and inconsistent system states.

? Code Example(s)

? View Code Example

// Sending a response with HTTP 424 Failed Dependency res.status(424).json({ error: "Failed Dependency", message: "Previous operation must succeed first" });

? Live Output / Explanation

? Interactive Example

Imagine a user registration flow where profile creation depends on account creation. If account creation fails, profile creation returns 424 Failed Dependency.

? View Code Example

// Example of dependent API logic if (!accountCreated) { return res.status(424).send("Account creation failed"); }

? Use Cases

• Multi-step API workflows
• Transactional operations
• WebDAV request chains
• Microservices with dependencies