Setting up a Development Environment

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In this post, we will cover setting up a complete environment for developing on the TON Ecosystem. These tools will be discussed:

  • TON binaries (lite-client, tonlib, func, fift, ...)
  • toncli
  • ton-contract-executor
  • tonstarter-contracts
  • MyLocalTON

TON Binaries

NOTE: Completing this step is essential for developing on TON blockchain.

For developing on and interacting with TON Blockchain, you'll need to have the needed binaries for compilers, clients, nodes, ... . There are two options to get them:

  • Compiling from the source code
  • Getting binaries from Auto Builds

We'll need to proceed with the former option because Auto Builds aren't available for our target branch. Also, the official TON Binaries can be downloaded from ton repositories Auto Builds. But we will use a fork of TON which provides testing capabilities that are later needed. To build follow these steps:

  1. Install the latest versions of:
  • make
  • cmake >= 3.0.2
  • g++ or clang (or another C++ 14 compatible compiler)
  • OpenSSL (with C Headers) >= 1.1.1
  1. Clone SpyChesses's TON and switch to toncli-local branch:
git clone git checkout toncli-local
  1. Create a build directory in an arbitrary place, we will refer to it as <ton-build>. Also let's assume you have ton cloned in <ton-rep>, in a terminal:
cd <ton-build> cmake <ton-rep>
  1. Build each target:
cmake --build . --target lite-client cmake --build . --target func cmake --build . --target fift
  1. Those steps will take some time, wait until they're finished. Binaries will be available in:
fift: <ton-build>/crypto/fift
func: <ton-build>/crypto/func
lite-client: <ton-build>/lite-client/lite-client

You can copy them to a special directory and add them to your PATH. 6. TON Binaries are built and ready!


toncli is a cross-platform cli for TON, that makes smart contracts manipulation and interaction with blockchain much easier.

We will use a fork of toncli which comes with a new testing framework and thus needs forked TON binaries. To install you must follow these steps:

  1. Make sure to complete TON Binaries Section.
  2. Install python(>=3.9) from the official website on your system.

Note 1: Don't use the Microsoft store version if you're on windows.

Note 2: Make sure you add python to the PATH (On windows simply tick the Add Python 3.xx to PATH option)

  1. Install toncli using this command:
git clone cd toncli git checkout dev python develop

Note: If you see WARNING: The script toncli is installed in '.../Python/3.X/bin' which is not on PATH. add the mentioned address to your PATH environment variable.

  1. Go to the folder of TON binaries, and open a terminal in that folder. Then, run toncli command in the terminal. You should see that it automatically detects the binaries and sets them up. If for any reason it can't find the binaries, just provide the abstract path of binaries as it asks. Upon a successful detection you'll see an output like:

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As you see, toncli comes with several commands that help the development and interaction of smart contracts. The commands are well documented but we'll go through their usage here.

Setting up a project

To set up a project we can use start command to create a new project from an example project. Currently it has 4 options: wallet, external_data, external_code, and simple_storage. We will proceed with the simple_storage option:

toncli start simple_storage

You can see how the contract is implemented in simple_storage/func/ and how the tests are implemented in simple_storage/tests/.

Project yaml file

The project.yaml file contains the project's structure and metadata. You can specify the contract with its data cell/fift files, func contracts, and tests there so toncli detects and uses them.

Testing contracts

Testing is essential during contract development to be sure about the contract's safety and to prevent unexpected behaviors. To run the tests:

toncli run_tests

This runs all the tests for the contracts specified in the project.yaml file.

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You can test one special contract by passing -c parameter.

toncli run_tests -c contract

Deploying contracts

You can deploy contracts to mainnet or testnet easily by using the command:

toncli deploy -n testnet -wc 0

It will create a wallet for you if not present and will request you to send some TONs to it, so the contract deployment fee is covered.

For a more detailed description, you can check toncli's docs.


Note: This library depends on ton-compiler which supports only macOS, at the time this article was written. So if you're not a macOS user you won't be able to use this library until the support is added.

ton-contract-executor allows you to run TVM locally and execute contracts, which eases writing, debugging, and fully testing your contracts before launching them to the network.

To set up, you'll need to:

  1. Install Node.js
  2. Install yarn package manager:
npm install --global yarn
  1. Create a directory representing your project's root, and initialize it:
yarn init
  1. Install ton-contract-executor and ton:
yarn add ton-contract-executor yarn add ton
  1. Create file contract.js with content:
let {SmartContract} = require("ton-contract-executor"); let { Cell } = require("ton"); async function main() { const source = ` () main() { ;; noop } int sum(int a, int b) method_id { return a + b; } ` let contract = await SmartContract.fromFuncSource(source, new Cell()) let res = await contract.invokeGetMethod('sum', [ // argument a { type: 'int', value: '1' }, // argument b { type: 'int', value: '2' }, ]) console.log('1 + 2 = ', res.result[0]) }; main().then(()=>{});
  1. After successful execution, you'll see the console log with the correct result.

This was just a basic example, you can develop scripts to read the code from contract files, and execute and test their methods. More examples are available at the main repository.


This project is a starter template for developing decentralized applications (dApps) on TON. It currently contains the codes for contract development but it will contain frontend and telegram bot templates for interaction with contracts in the future.

To get started:

  1. Install a modern version of Node.js.
  2. Make sure you complete TON Binaries step and add the binaries to your PATH environment variable. (fift and func must be detectable)
  3. Clone the repository:
git clone
  1. Install the dependencies:
npm install
  1. You're all set up!

Writing code

Contracts are present in contracts/, and the behavior of each subfolder and extension in the folder structure is as follows:

  • contracts/*.fc: standalone root contracts
  • contracts/imports/*.fc: shared import between contracts
  • contracts/imports/<contract>/*.fc: contract-specific imports - not shared
  • contracts/<contract>.tld: optional TL-B Schema for data and message ops
  • contracts/<contract>.ts: optional typescript file that encodes data and message ops

Building Code

In the repository root, run npm run build to build the contracts. If any errors occur they will be displayed, otherwise the resulting files are:

  • <contract>.merged.fc - merged and flattened FunC source code with all imports
  • <contract>.fif - compiled contract as Fift assembly file
  • <contract>.cell - the binary code cell of the compiled contract (for deployment)


You must build the code before proceeding to test. Run the tests using npm run test. The tests are run by TVM using ton-contract-executor.

Note: As mentioned before, at the time this article was written, ton-contract-executor runs only on macOS because of its dependency. So, you won't be able to run tests if you're not on macOS


First of all, build your contracts. Each contract to deploy should have a script build/<contract>.deploy.ts to return its init data cell.

The deployment wallet can be configured by the DEPLOYER_MNEMONIC variable in the .env file. You should provide the 24 secret words in the .env like:

DEPLOYER_MNEMONIC="tumble degree cousin sand ..."

Run npm run deploy for deploying on mainnet and npm run deploy:testnet for testnet, then follow the on-screen instructions.

More details are available at the main repository.


MyLocalTON is a cross-platform local TON Blockchain. It comes as a standalone application in form of a .jar file.

It can be used to ease testing and inspecting the state of the blockchain, without the need to use and deploy on the testnet.

To setup MyLocalTON:

  1. Make sure of OpenJDK17 Installation, If you already have it, skip this step.

In case of need, these are some guides on installing OpenJDK:

  1. Proceed to Auto Builds of MyLocalTON, Open the latest successful build and download MyLocalTon from the generated artifacts.

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  1. Extract the downloaded file and execute it with java:
java -jar MyLocalTon.jar
  1. You'll see the following screen,It will take some time to initialize TON Blockchain:

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  1. After successful initialization, the blockchain will be ready:

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