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On this page
  • Overview
  • How to deploy a smart contract on Harmony?
  • How to create a simple DApp on Harmony?
  • Resources
  • Known Limitations

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  1. Developers

Getting Started

A quick guide to getting started with developing on Harmony blockchain.

PreviousCommunityNextNetwork & Faucets

Last updated 8 months ago

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Overview

Harmony is a powerful blockchain that is EVM compatible with sharding and features. Developing on Harmony should feel very familiar for Ethereum developers, as Harmony is and inherits almost all the tools and libraries from Ethereum, like truffle, remix, web3js, etc.

The simplest way to interact with Harmony blockchain is via JSON RPCs.

Querying Harmony blockchain using JSON RPCs

  • JSON and curl command

To really explore the full potential of Harmony blockchain, creating a wallet is the next step.

Creating a wallet (or ONE address)

  • Using or browser extensions. Any other can also be used.

  • Harmony , also provides a quick way to create/manage wallet, interact with blockchain, etc.

Harmony uses address format with one1 prefix, however Ethereum style hex address can also be used. For example: one1pdv9lrdwl0rg5vglh4xtyrv3wjk3wsqket7zxy bech32 address is equivalent to 0x0B585F8DaEfBC68a311FbD4cB20d9174aD174016 hex address. Quick way to convert between formats is using explorer: , at the top you will find "ONE / ETH address" options.

Development environments

  • Several development environments exists:

  • Testnet faucet

  • Blockchain Explorers

    • Mainnet:

    • Testnet:

We provide SDKs in several different languages. However most feature complete is our JavaScript SDK, which is the preferred language for DApp development.

Using SDKs to interact with Harmony blockchain

  • Other SDKs include: Golang CLI, Java SDK, Python SDK

    • Note that, the Python SDK has only read-only features, meaning no transaction signing or smart contracts

How to deploy a smart contract on Harmony?

How to create a simple DApp on Harmony?

Resources

Known Limitations

  • Only cross-shard native token (ONE token) transfers are allowed. No cross-shard for HRC20 or other contracts. Meaning, smart contracts are deployed on shard-0 and all contract interactions happen on shard-0. Contracts can still be deployed on other shards, however they won't be able to interact with contracts in other shards. We have cross-shard smart contract on our roadmap for 2023.

Feel free to ping any POPS member for issues on the testnet network/explorer/faucet on harmony discord @harmony-pops or telegram Faucet can also be refilled by anyone by sending fund back to the contract address shown on

About

The most popular is our , which includes examples, documentation, and DApps developed in previous hackathons

One of the best ways to get started is to use which now has integrated Harmony support.

You can also use the to get started.

Many other examples and DApps can be found in the and under .

- for reporting issues, asking questions, or interact with other developers

Harmony

Harmony dev

Discord channels: ,

Harmony dev

🏗️
staking
fully Ethereum compatible
RPCs
examples
MetaMask
mathwallet
wallets
CLI
bech32
https://explorer.harmony.one/#/address/one1pdv9lrdwl0rg5vglh4xtyrv3wjk3wsqket7zxy
mainnet, testnnet, localnet
https://faucet.pops.one
https://chaindrop.org
https://explorer.harmony.one
https://explorer.testnet.harmony.one
P-OPS Team Validator
https://faucet.pops.one
SDKs
JavaScript SDK
Tutorial
Github repo
Interacting with wallets programmatically
scaffold-eth
Harmony DApp template generator
Tutorial
GitHub repo
SDK repo
showcases
talk.harmony.one
GitHub
Reddit
#developers
#development
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