AkousaTypeError: Cannot read properties of undefined/nullAn attempt was made to access a property or method on undefined or null.
You tried to access a property on a value that is undefined or null. This commonly occurs when accessing nested object properties without checking intermediate values, when an API response is missing expected fields, or when a DOM element was not found.
Use optional chaining (obj?.prop?.nested) to safely access nested properties. Add null checks before property access. Verify API responses contain expected fields. Use default values with nullish coalescing (value ?? default).
const user = undefined; console.log(user.name); // TypeErrorEACCESThe process does not have permission to access the file or resource.
ERR_INVALID_ARG_TYPEA Node.js API received an argument of the wrong type.
ReferenceError: x is not definedA variable was referenced that has not been declared in any accessible scope.
UnhandledPromiseRejectionA Promise was rejected but no .catch() handler or try-catch block was present to handle the rejection.
ERR_BUFFER_OUT_OF_BOUNDSAn attempt was made to read or write outside the bounds of a Buffer.
SyntaxError: Missing initializer in const declarationA const variable was declared without an initial value.