Flow JavaScript SDK

Introducing @onflow/fcl

Flow's JavaScript SDK was created to make developing JavaScript applications that connect to the Flow blockchain easy and secure.

While it would be possible to create a Flow wallet as a browser plugin, we specifically created @onflow/fcl so that web-based dapps don’t have to depend on browser plugins. @onflow/fcl is able to connect browser-based dapps to a wallet service, or a wallet installed on your phone or running on your local computer without introducing the security risks that can come from installing a browser plugin.

Wallet Discovery

@onflow/fcl also eliminates the need for dapp developers to write code to integrate their user's preferred wallet into their application. Instead,@onflow/fcl uses a secure discovery protocol that wallets can implement to connect to @onflow/fcl. The end result is dapps using @onflow/fcl automatically integrate all compatible wallets without their developers needing to write any custom code!

Limitless Development

@onflow/fcl enables cross-platform dapps. By not depending on JavaScript injection as a mechanism for connecting dapps with wallets, native desktop dapps and mobile dapps can connect to the same wallet software as browser dapps.

Getting Started with FCL

To use the Flow JavaScript SDK in your application, install using yarn or npm

npm i -S @onflow/fcl @onflow/types

Learn to use @onflow/fcl: Flow App Quickstart

Requirements

Please note, that some code provided - e.g. Object.fromEntries - will require Node version v12.0.0 or higher.