Tutorial GitHub Repository

This tutorial demonstrates how to convert between an EVM hex address and a Cosmos bech32 address.

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Prerequisites

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Project Setup

First, we need to create a new directory for our project.

mkdir address-conversion
cd address-conversion

Next, we will initialize the project and installed the bech32-converting package.

npm init
npm install bech32-converting

We then create a new file called index.js in the src directory where we will write our code.

You can use any package that allows you to encode and decode bech32-prefixed addresses. However, the specific steps for using those packages may vary.

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Development

For this tutorial, we will assume that we have an EVM address 0x0901aeeD1d5144987DaE3D95AB219ff75e9bA636 that we want to convert to a Cosmos address, and then convert it back to an EVM address.

First, we import the bech32-converting package and initialize the variable for the chain’s Bech32 prefix.

src/index.js
const converter = require("bech32-converting")
let bech32Address = "init1pyq6amga29zfsldw8k26kgvl7a0fhf3kftflmr";

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EVM Address to Cosmos Address

To convert an EVM address to a Cosmos address, we will be using the bech32-converting package’s toHex function.

src/index.js
const hexAddress = converter('init').toHex(bech32Address)
console.log(hexAddress) // 0x0901aeeD1d5144987DaE3D95AB219ff75e9bA636

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Cosmos Address to EVM Address

To convert a Cosmos address to an EVM address, we will be using the bech32-converting package’s fromHex function.

src/index.js
bech32Address = converter('init').toBech32(hexAddress)
console.log(bech32Address) // init1pyq6amga29zfsldw8k26kgvl7a0fhf3kftflmr

The full code for the script is then as follows:

src/index.js
const converter = require("bech32-converting")

let bech32Address = "init1pyq6amga29zfsldw8k26kgvl7a0fhf3kftflmr";

const hexAddress = converter('init').toHex(bech32Address)
console.log(hexAddress) // 0x0901aeeD1d5144987DaE3D95AB219ff75e9bA636

bech32Address = converter('init').toBech32(hexAddress)
console.log(bech32Address) // init1pyq6amga29zfsldw8k26kgvl7a0fhf3kftflmr

If we run this script, we should see the following output:

0x0901aeeD1d5144987DaE3D95AB219ff75e9bA636
init1pyq6amga29zfsldw8k26kgvl7a0fhf3kftflmr