The error codes every web developer encounters daily — HTTP, JavaScript, TypeScript, CSS, and Nginx.
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.
302The requested resource temporarily resides at a different URL. Future requests should continue to use the original URL.
304The resource has not been modified since the last request, so the client can use its cached copy.
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.
405The HTTP method used is not supported for the requested resource.
409The request conflicts with the current state of the server resource.
429The user has sent too many requests in a given amount of time (rate limiting).
500The server encountered an unexpected condition that prevented it from fulfilling the request.
502A gateway or proxy server received an invalid response from the upstream server.
503The server is temporarily unable to handle the request due to maintenance or overloading.
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.
ECONNREFUSEDThe connection was refused because no server is listening on the target address and port.
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.
TS2345The argument passed to a function is not compatible with the expected parameter type.
TS2307TypeScript cannot find the module specified in an import or require statement.
ERR_CONNECTION_REFUSEDThe browser's connection attempt was actively refused by the server.
CORS: Missing Access-Control-Allow-OriginThe server's response does not include the required Access-Control-Allow-Origin header.
Mixed Content BlockedAn HTTPS page is loading resources over insecure HTTP.
Invalid property valueThe value assigned to a CSS property is not valid for that property.
Specificity conflictA CSS rule is not applied because a more specific selector overrides it.
502 Bad GatewayNginx received an invalid response from the upstream server.
504 Gateway TimeoutNginx timed out waiting for a response from the upstream server.