JsonWebTokenHandler.CanReadToken(String) Method

Reference

Definition

Namespace:: Microsoft.IdentityModel.JsonWebTokens

Assembly:: Microsoft.IdentityModel.JsonWebTokens.dll

Package:: Microsoft.IdentityModel.JsonWebTokens v8.2.0

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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-_]$"

Applies to

共用方式為