All Errors

This error occurs when trying to access the "length" property of an undefined value, typically on arrays or strings. In React, this commonly happens when component state, props, or API response data are undefined or not properly initialized, leading to crashes when accessing array methods or string properties.

The ENOENT (Error NO ENTry) error occurs when Node.js attempts to access a file or directory that does not exist at the specified path. This is one of the most common filesystem errors and typically results from incorrect file paths, relative path confusion, or missing files. Understanding how Node.js resolves paths is essential to fixing this error permanently.

This error occurs when Node.js attempts a file system operation that the operating system denies due to insufficient permissions. It commonly happens during chmod, rename, unlink, or write operations, particularly on Windows with antivirus software or on Unix-like systems with incorrect file ownership.

This error occurs when attempting to remove a directory that contains files or subdirectories using fs.rmdir() or fs.rmdirSync(). Node.js refuses to delete non-empty directories unless the recursive option is enabled.

This error occurs when ReactDOM.render() or createRoot() tries to mount to a DOM element that does not exist or is null. Common causes include targeting the wrong element ID, loading React before the DOM is ready, or missing the target div in your HTML. Fix it by ensuring the target element exists and scripts load after the DOM.

This error occurs when Node.js file system operations expect a directory path but receive a file path instead. It commonly appears with fs.readdir(), fs.scandir(), or file watching utilities.

The ESRCH error occurs when attempting to send a signal to a process that no longer exists. This typically happens with process.kill() or child process operations when the target process has already exited.

This error occurs when Node.js child_process.exec() tries to execute a command that cannot be found by the shell (/bin/sh). The shell either cannot locate the executable in PATH or the command does not exist on the system.

ETIMEDOUT occurs when a network operation in Node.js does not complete within the specified or default time limit. This typically happens during HTTP requests, database connections, or socket operations when the remote server fails to respond in time.

This warning appears when using the worker_threads module in Node.js versions prior to v12, where the feature was still experimental. Worker threads became stable in Node.js v12 LTS, so upgrading to v12+ is the primary solution.

This error occurs when trying to use the CommonJS global __filename in an ES module. ES modules use a different approach to access file paths and do not provide __filename by default.

This error occurs when a server acting as a gateway or proxy does not receive a timely response from an upstream server. It commonly happens when your Node.js application makes requests to external APIs, databases, or microservices that take too long to respond, exceeding the configured timeout limits.

This error occurs when child_process.execFile() attempts to execute a script file that lacks executable permissions. The Node.js process cannot spawn the file as a child process because the operating system denies execution.

Occurs when Node.js cannot authenticate with MySQL due to incorrect credentials, insufficient permissions, or authentication plugin mismatches.

This error occurs when you pass an argument of the wrong type to a Node.js function that expects a string. It's commonly triggered when file system methods receive a number, undefined, null, or object instead of a string path.

This error occurs when attempting to allocate a Node.js Buffer with an invalid size—typically negative, zero, or exceeding platform limits. Buffer.alloc() and Buffer.allocUnsafe() enforce strict validation to prevent memory allocation failures.

This error occurs when Node.js tries to parse your package.json file but finds invalid JSON syntax. Common culprits include missing commas, mismatched quotes, or trailing commas. The error can be fixed by validating the JSON structure and correcting syntax errors.

Using await inside startTransition without proper wrapping causes state updates to lose their transition context, leading to race conditions and out-of-order updates. In React 18, any state updates after an await must be wrapped in additional startTransition calls to maintain proper transition behavior.

This error occurs when startTransition is called directly in the render phase instead of in event handlers or effects. React requires startTransition to be called during non-render phases to properly manage concurrent updates and maintain rendering stability.

This React 18 error occurs when attempting to wrap text input state updates inside startTransition or useTransition. React prevents transition updates from controlling text inputs because user input must be treated as urgent, not deferrable.