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Tact language

Tact is a programming language for TON Blockchain, focused on efficiency and ease of development. It is a good fit for complex smart contracts, quick onboarding, and rapid prototyping.

Developed by TON Studio, powered by the community — by the end of 2024, the number of unique code1 contracts deployed on the Mainnet reached almost 28,000, of which about 33% were written in Tact. You can view some selected projects here: Tact in production.

Tact has undergone a comprehensive security audit by Trail of Bits, a leading Web3 security firm.

Try it online!

Tact documentation

Awesome Tact

Features​

The most prominent and distinctive features of Tact are:

Security​

Tact in production​

Some selected software and applications based on contracts written in Tact, deployed in production, and consumed by end users:

Open source or source available​

Closed source​

See Tact in production on the Awesome Tact list.

Installation​

Compiler​

The Tact compiler is distributed as an npm package bundled with the Tact standard library.

The recommended Node.js version is 22 or higher, while the minimum version is 18.

Use your favorite package manager to install it into a Node.js project:

# Example with yarn (others work too)
yarn add @tact-lang/compiler

# you can also use npm
npm i @tact-lang/compiler@latest

# or pnpm
pnpm add @tact-lang/compiler

# or bun
bun add @tact-lang/compiler

Alternatively, you can install it globally as such:

npm i -g @tact-lang/compiler

It will make the tact compiler available in your PATH, as well as:

  • a convenient unboc disassembler for contract code compiled into the Bag of Cells (BoC) (.boc) format,
  • a formatter tact-fmt, which can format or check the formatting of individual Tact files and directories.

Tooling​

JetBrains IDEs​

There are several ways to install a plugin:

Visual Studio Code​

Visual Studio Code is a free and popular IDE for developers.

Sublime Text​

Vim​

All-in-one Vim 8+ plugin for Tact language.

Neovim​

To enable syntax highlighting in Neovim, follow the installation instructions in the nvim-treesitter quickstart guide.

To make sure .tact extension is properly recognized, install the tact.vim plugin.

Helix​

To enable support of the Tact language, refer to the following instructions:

  1. For latest syntax highlighting, setup tree-sitter-tact
  2. For editor intelligence, setup tact-language-server

Security​

Utility​

  • Formatter (tact-fmt) — the official formatter. It ships with the Tact Language Server, VS Code extension, and as a standalone binary with the compiler. You can invoke it by running npx tact-fmt in your Tact projects.
  • BoC Disassembler (unboc) — disassembler for .boc files. Ships as a standalone binary with the compiler. You can invoke it by running npx unboc in your Tact projects.

Getting started​

For a quick start, read the "Let's start!" mini-guide in the Tact documentation. It uses the Blueprint development environment for writing, testing, and deploying smart contracts on TON Blockchain.

If you want more manual control, use tact-template. It's a ready-to-use template with the development environment set up, including the Tact compiler with TypeScript + Jest, a local TON emulator, AI-based editor support, and examples of how to run tests.

git clone --depth 1 https://github.com/tact-lang/tact-template

Community​

If you can’t find the answer in the docs, or you’ve tried to do some local testing and it still didn’t help — don’t hesitate to reach out to Tact’s flourishing community:

Contributing​

Contributions are welcome! To help develop the compiler, see the contributing guide.

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Footnotes​

  1. The "unique code" means that each contract in the data sample has at least one TVM instruction that differs from the other contracts, excluding many preprocessed wallets with everything inlined — even seqno and a public key for signature verification! ↩