Many necessary supplemental packages are available from the Dart team, including:

Characters : Characters, also known as Unicode (extended) grapheme clusters, are strings seen as sequences of user-perceived characters. The Characters class provides access to a string's feelings and a mechanism to move between them using a CharacterRange.

Intl : Intl is the most important library. It declares the Intl class, the default locale, and methods for interacting with most internationalization processes. The DateFormat, NumberFormat, and BidiFormatter classes are also defined in this package.

HTTP : This package includes a collection of high-level methods and classes for consuming HTTP resources. It's cross-platform, with mobile, desktop, and browser support. The top-level functions provide the most convenient access to this library.

Crypto : A collection of cryptographic hashing methods written entirely in Dart in a single input digest. It can Invoke the convert method on the sha1, sha256, or md5 objects to hash a list of bytes.

Markdown : Markdown library is a Dart-based portable. On both the client and the server, it can parse Markdown into HTML. A few Markdown extensions are supported and provided in the initial Perl Markdown implementation. The ones that CommonMark supports are activated by default.