All Errors

The CastError occurs when MongoDB/Mongoose tries to cast a value to ObjectId format but the value is invalid. This commonly happens when querying by _id with a string that's not a valid 24-character hex string, or when route parameters are misinterpreted as ObjectIds.

This error occurs when fs.mkdir() attempts to create a directory that already exists. It commonly happens in concurrent operations, race conditions, or when running build scripts multiple times without proper existence checks.

This TypeScript error (TS2367) occurs when you compare values of incompatible types that can never be equal. The comparison will always return false because the types have no common values. The fix involves checking your comparison logic, ensuring types match, or using type assertions if TypeScript's type narrowing is incomplete.

This error occurs when a TypeScript composite project tries to use compiler options that are incompatible with composite project configuration. The most common cause is conflicting settings between composite mode and skipLibCheck options.

This error occurs when Node.js attempts to perform I/O operations on a file descriptor that has already been closed or is invalid. It commonly happens with double-close scenarios, premature stream closures, or attempting to read/write after a file handle has been released.

This error occurs when the Node.js cluster module attempts to create a worker with an ID that already exists in the active worker pool. It typically happens when worker IDs are manually assigned or when the primary process tries to create duplicate workers without properly tracking existing worker IDs.

This error occurs when a class's constructor signature doesn't match the constructor signature expected by a type or interface. TypeScript is strict about constructor compatibility when using classes with type-based constructor signatures.

This TypeScript error indicates a logical condition that the type checker has determined will always evaluate to the same boolean value. This typically happens due to type narrowing, incompatible type comparisons, or redundant checks that make code unreachable.

This error occurs when Node.js attempts to establish a TCP connection to a server (database, API, or service) but the connection is actively refused. The target server is either not running, not listening on the specified port, or actively rejecting connections due to firewall rules or network configuration.

This error occurs when TypeScript's conditional types generate union branches that exceed the compiler's complexity limits. This typically happens with recursive conditional types or deeply nested generic constraints. Refactoring to break down complex type logic into simpler pieces usually resolves the issue.

This error occurs when Node.js crypto functions receive a private key in an incompatible or malformed format. The crypto module expects keys in specific encodings (PEM, DER, or JWK) with proper structure and headers.

This error occurs when a callback function passed to process.nextTick() throws an uncaught exception. Since nextTick callbacks execute before the event loop continues, unhandled errors in these callbacks will crash the Node.js process.

This error occurs when a Promise remains in a pending state indefinitely because neither resolve() nor reject() is ever called. The code after await never executes, causing operations to hang or the application to appear frozen.

Promise.all() rejects immediately when any single promise in the array rejects, causing an unhandled promise rejection if not properly caught. The entire operation fails even if other promises would have succeeded.

This warning occurs when promises remain unresolved indefinitely, preventing JavaScript's garbage collector from freeing memory. Long-lived or infinite promise chains accumulate in memory, eventually leading to performance degradation or out-of-memory crashes.

This error occurs when your Node.js application or npm tries to connect through a proxy server that requires authentication credentials. The request is rejected because no valid username and password were provided to the proxy.

This error occurs when code attempts to use a non-function value as a function, or when a function is expected to return a promise but returns a non-thenable value instead. It commonly happens in promise chains, async/await operations, or when working with promise constructors.

Node.js throws this error when require() or import attempts to load a module from a directory path that does not exist in the filesystem. This commonly happens due to incorrect paths, missing installations, or misconfigured module resolution.

A segmentation fault occurs when Node.js or a native addon attempts to access memory it is not permitted to access, causing the process to crash with a "Segmentation fault (core dumped)" message. This typically indicates a bug in native C/C++ modules rather than JavaScript code.

The spawn EACCES error occurs when Node.js attempts to spawn a child process but lacks execute permissions on the target executable. This commonly happens with binary files in node_modules or custom scripts that are missing the executable bit.