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Java implementation of JSON Web Token (JWT)

There is a newer version: 4.4.0

package com.auth0.jwt.interfaces;

/**
 * The Header class represents the 1st part of the JWT, where the Header value is hold.
 */
public interface Header {

    /**
     * Getter for the Algorithm "alg" claim defined in the JWT's Header. If the claim is missing it will return null.
     *
     * @return the Algorithm defined or null.
     */
    String getAlgorithm();

    /**
     * Getter for the Type "typ" claim defined in the JWT's Header. If the claim is missing it will return null.
     *
     * @return the Type defined or null.
     */
    String getType();

    /**
     * Getter for the Content Type "cty" claim defined in the JWT's Header. If the claim is missing it will return null.
     *
     * @return the Content Type defined or null.
     */
    String getContentType();

    /**
     * Get the value of the "kid" claim, or null if it's not available.
     *
     * @return the Key ID value or null.
     */
    String getKeyId();

    /**
     * Get a Private Claim given it's name. If the Claim wasn't specified in the Header, a NullClaim will be returned.
     *
     * @param name the name of the Claim to retrieve.
     * @return a non-null Claim.
     */
    Claim getHeaderClaim(String name);
}