Module @klayr/chain-connector-plugin - v0.1.4


Klayr SDK

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What is the Klayr SDK?

The Klayr SDK aims to provide an easy and reliable software development kit for building blockchain applications which are compatible with the klayr protocol.

The architecture of the Klayr SDK has been designed so that it can be extended to meet the requirements of a wide variety of blockchain application use cases.

The codebase is written entirely in JavaScript/TypeScript, which means for a majority of developers, no significant change of tools or mindset is required to get started.

The Klayr SDK makes every effort to allow developers to focus simply and purely on writing the code that matters to their own blockchain application, and nothing more.


klayr SDK is an all-in-one package that provides you with tools to create, run and maintain blockchain applications in JavaScript/TypeScript.


The following dependencies need to be installed in order to run blockchain clients created with the Klayr SDK.


If you are using NVM, install the correct version as shown below:

nvm install v18.19.1

Klayr Commander

It is recommended to install Klayr Commander globally with NPM (Node Package Manager), to facilitate the convenient usage of the Klayr Commander CLI.

npm install --global klayr-commander@beta

To check the successful installation of Klayr Commander, run the following command:

$ klayr --version
klayr-commander/6.0.0 darwin-arm64 node-v18.19.1

Toolchain dependencies

Once Klayr Commander is installed, install the following compiler dependencies as well.

sudo apt update
sudo apt install -y libtool automake autoconf curl build-essential python2-minimal

Ensure that Homebrew is installed.

brew install autoconf automake libtool python2

Initializing a new blockchain client

Execute the klayr init command of Klayr Commander as shown below, to bootstrap a default blockchain client in the current folder.

klayr init

As a result of executing the init command, you will be asked for the Name, ChainID, Description, Author, and License of the new blockchain client.

Using template "klayr-ts"
Initializing git repository
Updating .klayrrc.json file
Creating project structure
? Application name my_client
? Chain ID in hex representation. ChainID must be 4 bytes (8 characters) 12345678
? Application description A simple blockchain client for my Web3 application
? Author XYZ
? License ISC

Next, all the required files are created by Klayr Commander.

It is now already possible to start the newly bootstrapped blockchain client with default configurations for a local Devnet:

./bin/run start

Configure your blockchain parameters

The blockchain client offers a variety of configuration options such as blockTime, maxTransactionsSize, and much more.

For a complete overview of the client configuration options, please check out the SDK configuration reference and the Blockchain client configuration guide.

To use the custom config with the client, use the --config flag. Also add the --overwrite-config flag, if you used another config the last time the client was started.

./bin/run start --config config/custom_config.json --overwrite-config

Registering new modules and plugins

A module defines the logic that makes state changes on-chain, meaning that it will be a part of the blockchain protocol.

A plugin, on the other hand, defines an off-chain logic that is not part of the blockchain protocol but enhances the blockchain application features.

Add your new module or plugin to your blockchain client conveniently with Klayr Commander:

Generating a new module

Use the generate:module command in the root folder of the blockchain client to generate a ready-to-use module template.

klayr generate:module my-module-name

For more detailed explanations how to create a module, please refer to the guide How to create a module

Generating a new plugin

Use the generate:plugin command in the root folder of the blockchain client to generate a ready-to-use plugin template.

klayr generate:plugin my-plugin-name

For a more detailed explanation of how to create a plugin, please refer to the guide: How to create a plugin


For further explanations, guides and tutorials, see the official Klayr SDK documentation.

Architecture Overview

The Klayr SDK operates on the NodeJS runtime and consists primarily of an application framework (Klayr Framework), a collection of libraries providing blockchain application functionalities (Klayr Elements), and a powerful command-line tool (Klayr Commander) helping developers to build a blockchain application using Klayr Framework. The diagram below provides a high-level overview of the architecture:



Directory Description
Framework An application framework responsible for establishing and maintaining the interactions between the modules of a Klayr blockchain application.
Elements A collection of libraries, each of them implementing some form of blockchain application functionality such as cryptography, transactions, p2p, etc.
Commander A command line tool to help developers to build a blockchain application using Klayr Framework.

Get Involved

Reason How
Want to chat with our community Reach them on Discord
Found a bug Open a new issue
Found a security issue See our bounty program
Want to share your research Propose your research
Want to develop with us Create a fork

How to Contribute

To contribute to klayr-sdk, framework or elements:

  1. Clone the repository: git clone

  2. Install Yarn Classic globally

  3. Install dependencies and build:

    1. yarn
    2. yarn build

Testing your local klayr-sdk in your application.

In order to link your local klayr-sdk repository and test your application which uses klayr-sdk, simply follow the steps below in your local klayr-sdk repository and run yarn link klayr-sdk in the root of your application.

  1. cd sdk

  2. yarn link

  3. Once you have linked your local repo, every time you make changes in klayr-sdk/elements you must build packages before testing:

    a. To build all packages: npm run build or yarn build

    b. To build specific package: yarn workspace <package name> build or go into each package folder and yarn build or npm run build Example: yarn workspace @klayr/p2p build

Note: In case you face any issues during the installation, make sure you have the right version of yarn and node and try resetting the project with yarn clean:full.



By using the Beta release of the Klayr SDK, you acknowledge and agree that you have an adequate understanding of the risks associated with the use of the Beta release of the Klayr SDK and that it is provided on an “as is” and “as available” basis, without any representations or warranties of any kind. To the fullest extent permitted by law, in no event shall the Klayr Foundation or other parties involved in the development of the Beta release of the Klayr SDK have any liability whatsoever to any person for any direct or indirect loss, liability, cost, claim, expense or damage of any kind, whether in contract or in tort, including negligence, or otherwise, arising out of or related to the use of all or part of the Beta release of the Klayr SDK.


Copyright 2016-2023 Lisk Foundation

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.



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