How to get "exp" from jwt token and compare with it current time to check if token is expired | ReadMeFeed

How to get "exp" from jwt token and compare with it current time to check if token is expired

user584018

Jan 27

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I am using System.IdentityModel.Tokens.Jwt package and the below code decoding the jwt token, but it won't give exp value?

 var handler = new JwtSecurityTokenHandler();
 var decodedValue = handler.ReadJwtToken("token");

How to get exp and compare it with the current DateTime to calculate token is expired or not?

Update:

I am using Azure.Core.AccessToken where I have the below property,

public DateTimeOffset ExpiresOn
    {
        get;
    }

jwt bearer-token azure-active-directory

1 answer

Accepted answer · original discussion

Sinan ILYAS

Dec 6

Permalink

This is how I check if a token is valid.

using System.IdentityModel.Tokens.Jwt;

private bool IsValid(string token)
{
    JwtSecurityToken jwtSecurityToken;
    try
    {
        jwtSecurityToken = new JwtSecurityToken(token);
    }
    catch (Exception)
    {
        return false;
    }
    
    return jwtSecurityToken.ValidTo > DateTime.UtcNow;
}

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3 question comments

Use comments to ask for clarification. Post a solution as an answer.

user584018Permalink

Jan 27

@Llama, I have azure ad token which generates through azure managed identity and looks like it's different than jwt token. it's a Azure.Core.AccessToken token

user584018Permalink

Jan 27

@Llama, I got my answer. if (token.ExpiresOn > DateTimeOffset.UtcNow). Thanks!