JwtSecurityTokenHandler.CanReadToken(String) Method

Definition

Namespace:

System.IdentityModel.Tokens.Jwt

Assembly:

System.IdentityModel.Tokens.Jwt.dll

Package:

System.IdentityModel.Tokens.Jwt v8.2.1

Determines if the string is a well formed Json Web Token (JWT).

See: https://datatracker.ietf.org/doc/html/rfc7519

public override bool CanReadToken (string token);

override this.CanReadToken : string -> bool

Public Overrides Function CanReadToken (token As String) As Boolean

Parameters

token

String

String that should represent a valid JWT.

Returns

Boolean

'false' if the token is null or whitespace.

'false' if token.Length is greater than MaximumTokenSizeInBytes.

'true' if the token is in JSON compact serialization format.

Remarks

Uses IsMatch(String, String) matching one of:

JWS: @"^[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]*$"

JWE: (dir): @"^[A-Za-z0-9-_]+\.\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]*$"

JWE: (wrappedkey): @"^[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]$"