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Prevent comment spam using Akismet service, in Dart.


  • Key Verification: checks an Akismet API key and gets a value indicating whether it is valid.
  • Comment Check: checks a comment and gets a value indicating whether it is spam.
  • Submit Spam: submits a comment that was not marked as spam but should have been.
  • Submit Ham: submits a comment that was incorrectly marked as spam but should not have been.


Installing via Pub

1. Depend on it

Add this to your package's pubspec.yaml file:

  akismet: any

2. Install it

If you're using the Dart Editor, choose:

Menu > Tools > Pub Get

Or if you want to install from the command line, run:

$ pub get

3. Import it

Now in your Dart code, you can use:

import 'package:akismet/html.dart'; // In browser applications.
import 'package:akismet/io.dart'; // In console applications.


Key Verification

var client = new Client('YourAPIKey', Uri.parse('http://your.blog.url'));
client.verifyKey().then((isValid) =>
  print(isValid ? 'Your API key is valid.' : 'Your API key is invalid.')

Comment Check

var author = new Author()
  ..ipAddress = ''
  ..userAgent = 'Mozilla/5.0';

var comment = new Comment('A comment.', author);
client.checkComment(comment).then((isSpam) =>
  print(isSpam ? 'The comment is marked as spam.' : 'The comment is marked as ham.')

Submit Spam/Ham

client.submitSpam(comment).then((_) => print('Spam submitted.'));
client.submitHam(comment).then((_) => print('Ham submitted.'));



The Akismet client comes in two flavors: a first one based on dart:io for server/console applications, and a second one based on dart:html for client/browser applications.

Their usage is the same, but the HTML client is limited by security restrictions in a browser context. Unfortunately, the Akismet service does not support CORS headers. So, the HTML client can't be used directly with the official service.


To be able to use the HTML client, we must rely on a proxy server adding CORS headers to service responses.

This is why a server implementation is provided with this package. To facilitate its usage, a command line interface is available in the bin folder.

From a command prompt, run the cli.dart script:

$ dart bin/cli.dart --help

Starts an Akismet.dart server.

    cli.dart [options]

-h, --help        output usage information
-V, --version     output the version number
-a, --address     address that the server should run on
                  (defaults to "")

-p, --port        port that the server should run on
                  (defaults to "3000")

-r, --redirect    the URL to redirect when a request is unhandled
    --silent      silence the log output from the server

Unit Tests


To test the dart:html client, launch a server instance, and points your browser to this link: Unit Tests of HTML Client


To test the dart:io client, you must set one or several environment variables prior to running the tests:

  • AKISMET_API_KEY: the Akismet API key (required).
  • AKISMET_BLOG: the front page or home URL (optional).
  • AKISMET_SERVICE_URL: the URL of the remote service (optional).

Then, run the io_test.dart script from a command prompt:

$ dart test/io_test.dart


Akismet.dart is distributed under the MIT License.



Base implementation of the package. @module core


dart:html implementation of the package. Import this module in browser applications. @module html


dart:io implementation of the package. Import this module in console applications. @module io