CosmosJS - Cosmos JavaScript Library

⭐ Developed / Developing by Cosmostation

A JavasSript Open Source Library for Cosmos Network, IRISnet, Kava and Band Protocol

This library supports cosmos address generation and verification. It enables you to create an offline signature functions of different types of transaction messages. It will eventually support all the other blockchains that are based on Tendermint in the future, such as IOV and others.

Installation

In order to fully use this library, you need to run a local or remote full node and set up its rest server, which acts as an intermediary between the front-end and the full-node

NPM

npm install @cosmostation/cosmosjs

Yarn

yarn add @cosmostation/cosmosjs

Browser Distribution

CosmosJS supports browserify.

Import

NodeJS

const cosmosjs = require("@cosmostation/cosmosjs");

CDN

You can find cosmosjs jsDelivr and use the global cosmosjs variable.
You can see example file at /example/browser-example.html

<script src="https://cdn.jsdelivr.net/npm/@cosmostation/cosmosjs@0.6.7/dist/cosmos.min.js"></script>

Usage

Cosmos: Generate Cosmos address from mnemonic

const cosmosjs = require("@cosmostation/cosmosjs"); 	// only NodeJS

const chainId = "cosmoshub-3";
const cosmos = cosmosjs.network(lcdUrl, chainId);

const mnemonic = "..."
cosmos.setPath("m/44'/118'/0'/0/0");
const address = cosmos.getAddress(mnemonic);
const ecpairPriv = cosmos.getECPairPriv(mnemonic);

Iris

const cosmosjs = require("@cosmostation/cosmosjs"); 	// only NodeJS

const chainId = "irishub";
const iris = cosmosjs.network(lcdUrl, chainId);
iris.setBech32MainPrefix("iaa");

Kava

const cosmosjs = require("@cosmostation/cosmosjs"); 	// only NodeJS

const chainId = "kava-3";
const kava = cosmosjs.network(lcdUrl, chainId);
kava.setBech32MainPrefix("kava");

Band

const cosmosjs = require("@cosmostation/cosmosjs"); 	// only NodeJS

const chainId = "band-wenchang-mainnet";
const band = cosmosjs.network(lcdUrl, chainId);
band.setBech32MainPrefix("band");

Generate ECPairPriv value that is needed for signing signatures

const ecpairPriv = cosmos.getECPairPriv(mnemonic);

Transfer ATOM to designated address.

Make sure to input proper type, account number, and sequence of the cosmos account to generate StdSignMsg. You can get those account information on blockchain
Above 0.5.0 version, CosmosJS follows the exact same json format as Cosmos SDK defines.

cosmos.getAccounts(address).then(data => {
	let stdSignMsg = cosmos.newStdMsg({
		msgs: [
			{
				type: "cosmos-sdk/MsgSend",
				value: {
					amount: [
						{
							amount: String(100000),
							denom: "uatom"
						}
					],
					from_address: address,
					to_address: "cosmos18vhdczjut44gpsy804crfhnd5nq003nz0nf20v"
				}
			}
		],
		chain_id: chainId,
		fee: { amount: [ { amount: String(5000), denom: "uatom" } ], gas: String(200000) },
		memo: "",
		account_number: String(data.result.value.account_number),
		sequence: String(data.result.value.sequence)
	});

	...
})

Sign transaction by using stdSignMsg and broadcast by using /txs REST API

const signedTx = cosmos.sign(stdSignMsg, ecpairPriv);
cosmos.broadcast(signedTx).then(response => console.log(response));

Cosmostation offers LCD url(https://lcd-cosmos-free.cosmostation.io).

API Rate Limiting: 10 requests per second

Supporting Message Types (Updating...)

If you need more message types, you can see /docs/msg_types

Documentation

This library is simple and easy to use. We don't have any formal documentation yet other than examples. Ask for help if our examples aren't enough to guide you