Welcome to the Flow Developer Docs

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

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.

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

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

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.

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.

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.

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.

FLIP Fest was conducted over 3 months with over 100 developers participating in working on issues determined by the Flow team and the community for reward bounties provided by Flow!

Tools
Features & Improvements
Standards

A non-exhaustive list of Cadence contracts, scripts, transactions that exemplify best practices. These contracts are so-called foundational because they are standard interfaces that any FT or NFT contract will implement. They introduce commonly seen resources such as Vaults, Collections as well as standard events.

Get the Flow Down is a curated collection of the best Flow blockchain tools, tutorials, articles and more! If you have come across an awesome tutorial, tool, community, blog or you have created one yourself, please create a PR!

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.

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

A collection of helpful best-practices for writing Cadence code, sourced from the Flow team and contributions from our community.

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.