Essential error codes every new developer should know — simple explanations and fixes.
Akousa200The request has succeeded. The meaning of the success depends on the HTTP method used.
301The requested resource has been permanently moved to a new URL, and future requests should use the new URL.
400The server cannot process the request due to a client error, such as malformed syntax, invalid parameters, or corrupt data.
401The request requires user authentication. The client must provide valid credentials to access the resource.
403The server understood the request but refuses to authorize it. Unlike 401, re-authenticating will not help.
404The server cannot find the requested resource. The URL may be incorrect or the resource may have been deleted.
500The server encountered an unexpected condition that prevented it from fulfilling the request.
TypeErrorA value is not of the expected type. This is the most common JavaScript error, occurring when an operation encounters a value of the wrong type.
ReferenceErrorA reference was made to a variable that does not exist in the current scope.
SyntaxErrorThe JavaScript engine encountered code that does not conform to the language syntax.
SyntaxErrorPython encountered invalid syntax that cannot be parsed.
NameErrorA local or global name was referenced that has not been defined.
TypeErrorAn operation or function was applied to an object of an inappropriate type.
IndentationErrorThe code has incorrect indentation, which is syntactically significant in Python.
TS2304TypeScript cannot find a variable, function, or type with the specified name in the current scope.
TS2322A value of one type cannot be assigned to a variable or property of a different, incompatible type.
TS7006A function parameter has no type annotation and TypeScript cannot infer its type.
fatal: not a git repositoryThe current directory is not inside a Git repository.
CONFLICT (content): Merge conflictGit could not automatically merge changes because the same lines were modified in both branches.
Invalid property valueThe value assigned to a CSS property is not valid for that property.
Unknown propertyThe CSS property name is not recognized by the browser.