JsonWebTokenHandler.CanReadToken(String) Method

Definition

Namespace:

Microsoft.IdentityModel.JsonWebTokens

Assembly:

Microsoft.IdentityModel.JsonWebTokens.dll

Package:

Microsoft.IdentityModel.JsonWebTokens v7.5.2

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

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

public virtual bool CanReadToken (string token);

abstract member CanReadToken : string -> bool
override this.CanReadToken : string -> bool

Public Overridable 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:

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-_]$"