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Java implementation of JSON Web Token (JWT)

There is a newer version: 4.4.0

package com.auth0.jwt;

import com.auth0.jwt.exceptions.JWTDecodeException;

abstract class TokenUtils {

    /**
     * Splits the given token on the "." chars into a String array with 3 parts.
     *
     * @param token the string to split.
     * @return the array representing the 3 parts of the token.
     * @throws JWTDecodeException if the Token doesn't have 3 parts.
     */
    static String[] splitToken(String token) throws JWTDecodeException {
        String[] parts = token.split("\\.");
        if (parts.length == 2 && token.endsWith(".")) {
            //Tokens with alg='none' have empty String as Signature.
            parts = new String[]{parts[0], parts[1], ""};
        }
        if (parts.length != 3) {
            throw new JWTDecodeException(String.format("The token was expected to have 3 parts, but got %s.", parts.length));
        }
        return parts;
    }
}