Code Recipes Blog

In this post under JJWT, I will explain how to create a simple unsecured JSON Web Token whose payload is a set of claims.

I will be using JJWT framework for this example and for all the upcoming examples under JJWT.

Below is the complete code for your reference

Main class

1  package defaultPackage;
2  
3  import java.util.Date;
4  
5  import io.jsonwebtoken.JwtBuilder;
6  import io.jsonwebtoken.Jwts;
7  
8  public class Example1 {
9      public static void main(String[] args) {
10         JwtBuilder jwtBuilder = Jwts.builder();
11         
12         jwtBuilder.header().add("alg", "none").add("typ", "JWT");
13 
14         jwtBuilder.claims().subject("1234567890").issuedAt(new Date()).add("name", "Sumanth");
15         
16         String jwt = jwtBuilder.compact();
17         System.out.println(jwt);
18     }
19 }

In the above code at line 10, I create an instance of “JwtBuilder” using static method “builder” of “Jwts” class.

At line 12, I configure the header information of the JWT. I set the “alg” to “none” since we are not signing it or encrypting it. I set the “type” to “JWT”.

At line 14, I configure the claims information of the JWT. It will be a map of key value pairs. As shown in the code, I entered subject, date the JWT was issued and name.

Here “subject” and “issuedAt” are predefined standard fields, whereas “name” is custom field added by us.

At line 16, I call “compact” method available on “JwtBuilder” instance. This will create a compact unsigned or unencrypted JWT.

In this way we can create a simple unprotected JWT containing claims.

Output

eyJhbGciOiJub25lIiwidHlwIjoiSldUIn0.eyJzdWIiOiIxMjM0NTY3ODkwIiwiaWF0IjoxNzA1NzM4Mzg5LCJuYW1lIjoiU3VtYW50aCJ9.