Change-Password-Cognito

changePwdCognito.js

function ChangePassword(username, password, newpassword) {
        var authenticationDetails = new AmazonCognitoIdentity.AuthenticationDetails({
            Username: username,
            Password: password,
        });

        var userData = {
            Username: username,
            Pool: userPool
        };
        var cognitoUser = new AmazonCognitoIdentity.CognitoUser(userData);

        cognitoUser.authenticateUser(authenticationDetails, {
            onSuccess: function (result) {
                cognitoUser.changePassword(password, newpassword, (err, result) => {
                    if (err) {
                        console.log(err);
                    } else {
                        console.log("Successfully changed password of the user.");
                        console.log(result);
                    }
                });
            },
            onFailure: function (err) {
                console.log(err);
            },
        });
}

merci, cela fonctionne chez moi !

You may need to get the current user details first if you are getting a callback or user is not authenticated error:

 function getCurrentUser(username) {
  let userPool = new CognitoUserPool({
    Username: username,
    UserPoolId: config.identityPoolId,
    ClientId: config.userPoolWebClientId,
  });

  return userPool.getCurrentUser();
}

more details here