base on ⚡ Tact compiler for TON blockchain—build secure, efficient smart contracts with powerful tooling and seamless integration # Tact Language Compiler <div align="center">  A next-gen smart contract programming language for TON Blockchain focused on efficiency and ease of development. Tact is a good fit for complex smart contracts, quick onboarding, and rapid prototyping. Developed by [TON Studio](https://tonstudio.io), powered by the community — as of the beginning of 2025, the number of _unique code_[^1] contracts deployed on the mainnet reached almost 28 thousand, of which about 33% were written in Tact. You can view some selected projects here: [Tact in production](#tact-in-production). Tact has undergone a comprehensive security audit by [Trail of Bits](https://www.trailofbits.com), a leading Web3 security firm. **[Try online!] • [Features] • [Security] • [Key resources] • [Installation] • [Community] • [Contributing]** [Try online!]: https://ide.ton.org [Features]: #features [Security]: #security [Key resources]: #key-resources [Installation]: #installation [Community]: #community [Contributing]: #contributing [](https://tact-lang.org) [](https://docs.tact-lang.org) [](https://github.com/trailofbits/publications/blob/master/reviews/2025-01-ton-studio-tact-compiler-securityreview.pdf) [](https://x.com/tact_language) [](https://t.me/tactlang) [](https://t.me/tact_kitchen) </div> ## Features The most prominent and distinctive features of Tact are: - Familiar and user-friendly TypeScript-like syntax. - Strong static type system with built-in [Structs], [Messages], and [maps], among others. - First-class [maps] support, with many methods and a convenient [`foreach` statement][foreach] for traversing. - Automatic (de)serialization of incoming messages and data structures. - Automatic routing of [internal, external, and bounced messages][recvfun]. - Automatic handling of message types, including [binary, text, and fallback slices][recv]. - No boilerplate functions for [sending messages] and deploying child contracts. - Reusable behaviors through [traits]. - Support for low-level programming with [`asm` functions][asmfun]. - Generation of [single-file TypeScript wrappers] for convenient interactions with compiled contracts, which include: - Type definitions for [Structs] and [Messages] observable in the [compilation report]. - Corresponding `storeStructureName()` and `loadStructureName()` functions for (de)serialization. - All global and contract-level constants. - Bi-directional records of exit codes: from their names to numbers and vice versa. - Opcodes of all [Messages]. - A contract wrapper class with various helper functions for initialization, deployment, and message exchange. - Rich [standard library][stdlib]. - Extensive [documentation]. - Robust [tooling](#tooling). - ...and there's much more to come! [Structs]: https://docs.tact-lang.org/book/structs-and-messages#structs [Messages]: https://docs.tact-lang.org/book/structs-and-messages#messages [maps]: https://docs.tact-lang.org/book/maps [foreach]: https://docs.tact-lang.org/book/statements#foreach-loop [recv]: https://docs.tact-lang.org/book/receive/ [recvfun]: https://docs.tact-lang.org/book/contracts/#receiver-functions [sending messages]: https://docs.tact-lang.org/book/send/#message-sending-functions [traits]: https://docs.tact-lang.org/book/types/#traits [asmfun]: https://docs.tact-lang.org/book/assembly-functions/ [single-file TypeScript wrappers]: https://docs.tact-lang.org/book/compile/#wrap [compilation report]: https://docs.tact-lang.org/book/compile/#report [stdlib]: https://docs.tact-lang.org/ref/ [documentation]: https://docs.tact-lang.org/ ## Security - [Security audit of Tact by the Trail of Bits (2025, PDF)](https://github.com/trailofbits/publications/blob/master/reviews/2025-01-ton-studio-tact-compiler-securityreview.pdf) - Backup link: [PDF Report](https://github.com/tact-lang/website/blob/416073ed4056034639de257cb1e2815227f497cb/pdfs/2025-01-ton-studio-tact-compiler-securityreview.pdf) ## 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 - [Proof of Capital](https://github.com/proof-of-capital/TON) - [Proof of Capital](https://proofofcapital.org/) is a market-making smart contract that protects interests of all holders. - See the [security audit report](https://raw.githubusercontent.com/nowarp/public-reports/master/2025-01-proof-of-capital.pdf) by [Nowarp](https://nowarp.io). ###### Closed source - [Tradoor](https://tradoor.io) - Fast and social DEX on TON. - See the [security audit report](https://www.tonbit.xyz/reports/Tradoor-Smart-Contract-Audit-Report-Summary.pdf) by TonBit. - [PixelSwap](https://www.pixelswap.io) - First modular and upgradeable DEX on TON. - See the [security audit report](https://github.com/trailofbits/publications/blob/master/reviews/2024-12-pixelswap-dex-securityreview.pdf) by Trail of Bits. - [GasPump](https://gaspump.tg) - TON memecoin launchpad and trading platform. See [Tact in production](https://github.com/tact-lang/awesome-tact#tact-in-production-) on the Awesome Tact list. ## Key resources - [Awesome Tact](https://github.com/tact-lang/awesome-tact) - [Tact By Example](https://tact-by-example.org/00-hello-world) - [DeFi Cookbook](https://github.com/tact-lang/defi-cookbook) - [Documentation](https://docs.tact-lang.org) - [Changelog](./dev-docs/CHANGELOG.md) - [Documentation changelog](./dev-docs/CHANGELOG-DOCS.md) ## Installation ### Compiler The Tact compiler is distributed as an [NPM package](https://www.npmjs.com/package/@tact-lang/compiler) bundled with the [Tact standard library](https://docs.tact-lang.org/ref/). 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: ```shell # yarn is recommended, but not required 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: ```shell npm i -g @tact-lang/compiler ``` It will make the `tact` compiler available on your PATH, as well as: - a convenient `unboc` disassembler of a contract's code compiled into a [Bag of Cells](https://docs.tact-lang.org/book/cells/#cells-boc) `.boc` format. - a formatter `tact-fmt`, which can format or check the formatting of individual Tact files and directories. ### Tooling ###### Extensions and plugins - [VS Code extension](https://marketplace.visualstudio.com/items?itemName=tonstudio.vscode-tact) - Powerful and feature-rich extension for Visual Studio Code (VSCode) and VSCode-based editors like VSCodium, Cursor, Windsurf, and others. - Get it on the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=tonstudio.vscode-tact). - Get it on the [Open VSX Registry](https://open-vsx.org/extension/tonstudio/vscode-tact). - Or install from the [`.vsix` files in nightly releases](https://github.com/tact-lang/tact-language-server/releases). - [Language Server (LSP Server)](https://github.com/tact-lang/tact-language-server) - Supports Sublime Text, (Neo)Vim, Helix, and other editors with LSP support. - [Intelli Tact](https://plugins.jetbrains.com/plugin/27290-tact) - Powerful and feature-rich plugin for JetBrains IDEs like WebStorm, IntelliJ IDEA, and others. - [tact.vim](https://github.com/tact-lang/tact.vim) - Vim 8+ plugin. - [tact-sublime](https://github.com/tact-lang/tact-sublime) - Sublime Text 4 package. - Get it on the [Package Control](https://packagecontrol.io/packages/Tact). ###### Security - [Misti](https://github.com/nowarp/misti) - Static smart contract analyzer. - [TON Symbolic Analyzer (TSA)](https://github.com/espritoxyz/tsa) - Static smart contract analysis tool based on symbolic execution. ###### 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`](https://docs.tact-lang.org/book/cells/#cells-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!"](https://docs.tact-lang.org/#start) mini-guide in the Tact documentation. It uses the [Blueprint](https://github.com/ton-community/blueprint) development environment for writing, testing, and deploying smart contracts on TON Blockchain. If you want more manual control, use [tact-template](https://github.com/tact-lang/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. ```shell git clone --depth 1 https://github.com/tact-lang/tact-template ``` ## Community If you can’t find the answer in the [docs](https://docs.tact-lang.org), 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: - [`@tactlang` on Telegram](https://t.me/tactlang) - Main community chat and discussion group. - [`@tactlang_ru` on Telegram](https://t.me/tactlang_ru) _(Russian)_ - [`@tact_kitchen` on Telegram](https://t.me/tact_kitchen) - Channel with updates from the team. - [`@tact_language` on X/Twitter](https://x.com/tact_language) - [`tact-lang` organization on GitHub](https://github.com/tact-lang) - [`@ton_studio` on Telegram](https://t.me/ton_studio) - [`@thetonstudio` on X/Twitter](https://x.com/thetonstudio) ## Contributing Contributions are welcome! To help develop the compiler, see the [contributing guide](./dev-docs/CONTRIBUTING.md). In addition, we invite you to create new educational materials in any form, help foster the [community](#community), and build new [Tact contracts and projects](#tact-in-production). The best creations will be featured in [awesome-tact](https://github.com/tact-lang/awesome-tact) and on social media. Good luck on your coding adventure with ⚡ Tact! ## License MIT © The Tact Authors: Steve Korshakov; [TON Studio](https://tonstudio.io). [^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! ", Assign "at most 3 tags" to the expected json: {"id":"8761","tags":[]} "only from the tags list I provide: [{"id":77,"name":"3d"},{"id":89,"name":"agent"},{"id":17,"name":"ai"},{"id":54,"name":"algorithm"},{"id":24,"name":"api"},{"id":44,"name":"authentication"},{"id":3,"name":"aws"},{"id":27,"name":"backend"},{"id":60,"name":"benchmark"},{"id":72,"name":"best-practices"},{"id":39,"name":"bitcoin"},{"id":37,"name":"blockchain"},{"id":1,"name":"blog"},{"id":45,"name":"bundler"},{"id":58,"name":"cache"},{"id":21,"name":"chat"},{"id":49,"name":"cicd"},{"id":4,"name":"cli"},{"id":64,"name":"cloud-native"},{"id":48,"name":"cms"},{"id":61,"name":"compiler"},{"id":68,"name":"containerization"},{"id":92,"name":"crm"},{"id":34,"name":"data"},{"id":47,"name":"database"},{"id":8,"name":"declarative-gui "},{"id":9,"name":"deploy-tool"},{"id":53,"name":"desktop-app"},{"id":6,"name":"dev-exp-lib"},{"id":59,"name":"dev-tool"},{"id":13,"name":"ecommerce"},{"id":26,"name":"editor"},{"id":66,"name":"emulator"},{"id":62,"name":"filesystem"},{"id":80,"name":"finance"},{"id":15,"name":"firmware"},{"id":73,"name":"for-fun"},{"id":2,"name":"framework"},{"id":11,"name":"frontend"},{"id":22,"name":"game"},{"id":81,"name":"game-engine "},{"id":23,"name":"graphql"},{"id":84,"name":"gui"},{"id":91,"name":"http"},{"id":5,"name":"http-client"},{"id":51,"name":"iac"},{"id":30,"name":"ide"},{"id":78,"name":"iot"},{"id":40,"name":"json"},{"id":83,"name":"julian"},{"id":38,"name":"k8s"},{"id":31,"name":"language"},{"id":10,"name":"learning-resource"},{"id":33,"name":"lib"},{"id":41,"name":"linter"},{"id":28,"name":"lms"},{"id":16,"name":"logging"},{"id":76,"name":"low-code"},{"id":90,"name":"message-queue"},{"id":42,"name":"mobile-app"},{"id":18,"name":"monitoring"},{"id":36,"name":"networking"},{"id":7,"name":"node-version"},{"id":55,"name":"nosql"},{"id":57,"name":"observability"},{"id":46,"name":"orm"},{"id":52,"name":"os"},{"id":14,"name":"parser"},{"id":74,"name":"react"},{"id":82,"name":"real-time"},{"id":56,"name":"robot"},{"id":65,"name":"runtime"},{"id":32,"name":"sdk"},{"id":71,"name":"search"},{"id":63,"name":"secrets"},{"id":25,"name":"security"},{"id":85,"name":"server"},{"id":86,"name":"serverless"},{"id":70,"name":"storage"},{"id":75,"name":"system-design"},{"id":79,"name":"terminal"},{"id":29,"name":"testing"},{"id":12,"name":"ui"},{"id":50,"name":"ux"},{"id":88,"name":"video"},{"id":20,"name":"web-app"},{"id":35,"name":"web-server"},{"id":43,"name":"webassembly"},{"id":69,"name":"workflow"},{"id":87,"name":"yaml"}]" returns me the "expected json"