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# Develop a Blockchain Application in JavaScript with Lisk SDK

Ditch complex consensus mechanisms and build scalable blockchain applications using just JavaScript. The Lisk SDK empowers you to focus strictly on business logic for rapid, real-world deployments.

- **Speakers:** Manu Nelamane Siddalingegowda
- **Event:** World Congress 2021
- **Published:** June 30, 2021
- **Duration:** 1:52:16
- **URL:** https://www.wearedevelopers.com/videos/188-develop-a-blockchain-application-in-javascript-with-lisk-sdk

## Summary

The Lisk SDK empowers JavaScript developers to build highly scalable, custom blockchain applications quickly, abstracting away complex consensus mechanisms to focus strictly on business logic. This presentation introduces the Lisk framework alongside the release of Lisk Core 3.0, which introduces full interoperability alongside dynamic fee and address architectures. By lowering the barrier to decentralized software entry, Lisk encourages the rapid creation of real-world solutions—from stablecoins to NFT marketplaces—and incentivizes developers through a substantial List Grant Program designed to fund innovative proof-of-concept projects entirely built in JavaScript.

To demonstrate the practical workflow, the session walks through building a supply chain traceability application designed to immutably track product lifecycles from origin producers to end consumers. Using the `lisk-commander` CLI, developers can rapidly bootstrap a working blockchain environment and generate localized domains called "modules." For this use case, custom Producer and Supplier modules handle localized on-chain data. The core application utilizes specific "assets" to encapsulate data schemas, enabling farmers to register metadata like product IDs and origin dates directly onto an immutable ledger while ensuring transparency across subsequent supply chain steps.

A foundational architectural insight is Lisk's strict separation between on-chain mutation and off-chain execution. On-chain logic manages state mutations using a two-step verification process: static validation (evaluating incoming transaction payloads against JSON schemas) and stateful validation (verifying the current blockchain state, such as querying if a unique product ID already exists) before approving transactions. To facilitate secure inter-domain operations, Lisk employs "reducers," a concept allowing the Supplier module to securely access and transfer digital assets held by the Producer module. Finally, isolated off-chain plugins—like the HTTP API and the development dashboard—monitor real-time blockchain telemetry and event lifecycles, giving developers powerful observation layers without bloating the core consensus protocol.

**Keywords:** lisk sdk, javascript blockchain development, supply chain traceability dapp, on-chain state mutation, off-chain blockchain plugins, lisk-commander cli, custom blockchain modules, dpos consensus architecture, json schema validation, cross-module communication, blockchain stateful validation, lisk core interoperability, decentralized application architecture, crypto event monitoring, immutable ledger tracking

## Chapters

1. **Lisk grant program and Core release announcements** (00:02) — An introduction to funding opportunities and latest protocol updates.
1. **Understanding Lisk SDK architecture and functional components** (05:57) — How on-chain and off-chain layers interact using modules and plugins.
1. **Framework utilities for blockchain application bootstrapping** (11:09) — Using built-in plugins and testing frameworks to accelerate development.
1. **Installing prerequisites and establishing Lisk Commander setup** (14:58) — Setting up the specific Node.js version and CLI environment required.
1. **Initializing a blockchain application via command line** (18:05) — Generating a base application structure and a genesis block.
1. **Defining a supply chain traceability use case** (24:04) — Conceptualizing the interactions between producers, suppliers, and consumers.
1. **Generating custom modules and assets using CLI** (32:57) — Adding domain-specific business logic components to the blockchain application.
1. **Defining schemas and property types for serialization** (44:28) — Structuring asset data to guarantee predictable network communication.
1. **Implementing transaction validation and state mutation logic** (48:08) — Writing static and stateful validations before mutating account balances.
1. **Configuring data structures for supplier product collections** (57:25) — Defining custom storage properties to track products received by suppliers.
1. **Transferring products and implementing cross module reducers** (70:04) — Invoking reducers to securely exchange data between separate application domains.
1. **Registering custom modules and updating genesis block** (78:45) — Modifying application configurations and base block schemas to deploy execution.
1. **Monitoring transaction activities via the dashboard plugin** (88:16) — Creating accounts and submitting asset payloads through an integrated visual interface.
1. **Querying blockchain state with the HTTP API plugin** (94:23) — Requesting metadata from registered endpoints to track supply chains externally.
1. **Ecosystem benefits and developer question and answer session** (100:41) — Answering community questions on plugin patterns and client validation strategies.

## Related Moments

- [Overview of the Lisk blockchain and JavaScript SDK](https://www.wearedevelopers.com/videos/49-build-your-blockchain-application-in-javascript) (from "Build Your Blockchain Application in JavaScript")
- [Introduction to the Lisk platform and delegated proof of stake](https://www.wearedevelopers.com/videos/209-p2p-networks-in-blockchain) (from "P2P networks in Blockchain")
- [Designing on-chain architecture with custom Lisk modules](https://www.wearedevelopers.com/videos/49-build-your-blockchain-application-in-javascript) (from "Build Your Blockchain Application in JavaScript")
- [Evolution of the Lisk SDK and recent protocol features](https://www.wearedevelopers.com/videos/49-build-your-blockchain-application-in-javascript) (from "Build Your Blockchain Application in JavaScript")
- [Accelerating custom blockchain development via the Substrate framework](https://www.wearedevelopers.com/videos/409-blockchains-one-size-doesn-t-fit-all) (from "Blockchains: One Size doesn't Fit All")
- [Key scalability benefits of the Lisk blockchain platform](https://www.wearedevelopers.com/videos/49-build-your-blockchain-application-in-javascript) (from "Build Your Blockchain Application in JavaScript")

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- [Why Blockchain? A Developer’s Perspective](https://www.wearedevelopers.com/magazine/616-why-blockchain-a-developer-s-perspective)
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