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onflow.org
Flow Playground

Welcome to the Flow Developer Docs

Your resource for everything you'll need to build the future on Flow


‍Flow is a fast, decentralized, and developer-friendly blockchain, designed as the foundation for a new generation of games, apps, and the digital assets that power them. It is based on a unique, multi-role architecture, and designed to scale without sharding, allowing for massive improvements in speed and throughput while preserving a developer-friendly, ACID-compliant environment.

Get Started

⚡️Preview our new Flow Developer Portal ⚡️

  • With the growing number of developers, tools, and content in the Flow ecosystem, we are creating a new experience to help developers not only find and discover what they need, but also have new ways to connect and contribute with the community.
    We are launching the full experience in July 2022 but you can preview the new design, layout and content here:
    Homepage
    Getting Started
    Developer Tools

🏃‍♂️ Sample Projects

  • Flow App Quickstart

    A detailed guide covering how to use the FCL (Flow Client Library) to build a serverless app that connects to Flow, using React!

    Ready to jump right in? Use one of our quickstart projects: SvelteKitNextJSNuxtJS

  • 🆕 Kitty Items

    The Kitty Items application is a full-featured NFT marketplace that demonstrates what a full-stack application can look like on Flow. It's designed to showcase the power of Cadence and Flow's client libraries.

  • Flow Core Contracts

    The smart contracts that define the core functionality of the Flow protocol.

  • Wallet API Demonstration App

    A demonstration (written in TypeScript) of a RESTful API that implements a simple custodial wallet service for the Flow blockchain.

🛠 Developer Tools

  • Flow CLI

    The Flow CLI includes several commands to interact with Flow networks, such as querying account information, or sending transactions. It also includes the Flow Emulator.

  • Flow Emulator

    The Flow Emulator is a lightweight tool that emulates the behaviour of the real Flow network. The emulator exposes a gRPC server that implements the Flow Access API, which is designed to have near feature parity with the real network API.

  • VSCode Flow

    An extension for VSCode editor that integrates Cadence, the resource-oriented smart contract programming language of Flow, into Visual Studio Code. It provides features like syntax highlighting, type checking, code completion, etc.

  • FCL Developer Wallet

    An application that emulates Flow compatible wallets for use during local development. Click to view the project Github repository, or go to the Kitty Items project for instructions on how to use it while building your project.

🚀 Trending in the community

🏄🏼‍♂️ Learn Cadence

  • Open Cadence

    A list of high-quality Cadence code to help you learn and implement your smart-contract ideas. Highlights include:

    Mint an NFT
    Set NFT metadata
    Create an NFT marketplace
    Purchase an NFT on a marketplace

  • Cadence Tutorials

    A detailed guide covering how to start using the Cadence smart contract programming language. This guide also covers how to create scripts and transactions in Cadence to interact with Flow.

  • Cadence Language Reference

    The language definition for Cadence, covering Cadence syntax. Complete and up-to-date with examples.

  • Cadence Best Practices & Patterns

    A collection of helpful best-practices for writing Cadence code, sourced from Flow contributions.

  • Flow Playground

    The Flow Playground is an interactive browser-based IDE for experimenting with Cadence code. It uses the Cadence language server for full type-checking and error reporting. The Playground is the fastest way to prototype your Cadence project and experiment with the language.

👩‍💻 Flow SDKs

  • SDK Guidelines

    Considering building an SDK for Flow? These guidelines will help light your path.

  • Access Node - HTTP API

    Flow Access Nodes now have an HTTP API.

    Mainnet: https://rest-mainnet.onflow.org/v1/

    Testnet: https://rest-testnet.onflow.org/v1/

  • FCL (Flow Client Library)

    Connect to the Flow blockchain from your JavaScript environment. Works in both browser and NodeJS.

  • Flow GO SDK

    The Flow GO SDK is a powerful full-fetured set of tools for creating applications and services that leverage the Flow blockchain.

  • Flow JVM SDK

    The Flow JVM SDK is a library for JVM languages (e.g. Java, Kotlin) that provides utilities to interact with the Flow blockchain.

  • Community SDKs

    View all Available SDKs for Flow, including SDKs for Ruby, .NET, Elixir, Dart and others!


Join the Flow Developer Community