Form Processing So Easy It Will Knock You Out
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Chloro - Form Processing So Easy It Will Knock You Out


version 0.07


package MyApp::Form::Login;

use Moose;
use Chloro;

field username => (
    isa      => 'Str',
    required => 1,

field password => (
    isa      => 'Str',
    required => 1,


sub login {

    my $form = MyApp::Form::Login->new();

    my $resultset = $form->process( params => $submitted_params );

    if ( $resultset->is_valid() ) {
        my $login = $resultset->results();

        # Do something with $login->{username} & $login->{password}
    else {
        # Errors that are not specific to just one field
        my @form_errors = $resultset->form_errors();

        # Errors keyed by specific field names
        my %field_errors = $resultset->field_errors();

        # Do something with these errors


This software is still very alpha, and the API may change without warning in future versions.

For a walkthrough of all this module's features, see Chloro::Manual.

Chloro is yet another in a long line of form processing libraries. It differs from other libraries in that it is entirely focused on defining forms in programmer terms. Field types are Moose type constraints, not HTML widgets ("Str" not "Select").

Chloro is focused on taking a browser's submission, doing basic validation, and returning a data structure that you can use for further processing.

Out of the box, it does not talk to your database, nor does it know anything about rendering HTML. However, it is designed so that these features could be provided by extensions.


Chloro starts with forms. A form is a class which uses Chloro (and Moose).

package MyApp::Form::User;

use Moose;
use Chloro;

field username => (
    isa      => 'Str',
    required => 1,

In order to validate data against a form, you instantiate a form object and call $form->process():

my $form = MyApp::Form::User->new();
my $resultset = $form->process( params => $params );

The $params are a hash reference where the keys are field names and the values are field values. Under the hood, you can define a variety of parameter munging and validation methods, or just use the defaults.

The process() method returns a Chloro::ResultSet object. This object can tell you whether the submitted parameters were valid. If they weren't, you can dig into the errors associated with specific fields. You can also define validations against the form as a whole, and the resultset will have those errors too.

if ( $resultset->is_valid() ) {
else {
    my $result = $resultset->result_for('username');

    print $_->message() for $result->errors();

If the submission was valid, you can get the results as a hash reference:

my $hash = $resultset->results();

That's the basic workflow using Chloro.


If you're new to Chloro, you should start by reading Chloro::Manual.


Bugs may be submitted at or via email to

I am also usually active on IRC as 'autarch' on irc://


The source code repository for Chloro can be found at


If you'd like to thank me for the work I've done on this module, please consider making a "donation" to me via PayPal. I spend a lot of free time creating free software, and would appreciate any support you'd care to offer.

Please note that I am not suggesting that you must do this in order for me to continue working on this particular software. I will continue to do so, inasmuch as I have in the past, for as long as it interests me.

Similarly, a donation made in this way will probably not make me work on this software much more, unless I get so many donations that I can consider working on free software full time (let's all have a chuckle at that together).

To donate, log into PayPal and send money to, or use the button at


Dave Rolsky


Robbie Bow


This software is Copyright (c) 2017 by Dave Rolsky.

This is free software, licensed under:

The Artistic License 2.0 (GPL Compatible)

The full text of the license can be found in the LICENSE file included with this distribution.