> For the complete documentation index, see [llms.txt](https://signum-network.gitbook.io/signumjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://signum-network.gitbook.io/signumjs/getting-started/usage.md). # Usage Once you have added SignumJS to your application you usually want to connect to one of the Signum Network nodes to interact with the blockchain. All you need is to create an API instance to get access to the methods of the blockchain API. The following example shows how to get an account from the chain. {% tabs %} {% tab title="Javascript" %} {% code title="index.js" %} ```javascript const {composeApi} = require('@signumjs/core'); (async () => { const api = composeApi({ nodeHost: 'https://europe.signum.network', }); const account = await api.account.getAccount({accountId: '16107620026796983538'}); console.log('Account', account); })(); ``` {% endcode %} {% endtab %} {% tab title="Typescript" %} {% code title="index.ts" %} ```typescript import {composeApi} from '@signumjs/core'; (async (): Promise => { const api = composeApi({ nodeHost: 'https://europe.signum.network', }); const account = await api.account.getAccount({accountId: '16107620026796983538'}); console.log('Account', account); })(); ``` {% endcode %} {% endtab %} {% endtabs %} {% hint style="info" %} It is essential to understand the concept of [async/await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function) and [Promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises) in Javascript. Many functions of SignumJS require to communicate with remote servers and therefore you need to be familiar with asynchronous Javascript. {% endhint %} ## Usage with bundles When using the bundles imported via [\ ``` {% endcode %} {% code title="main.js" %} ```javascript (async () => { // the 'namespace' of @signum/core is sig$ const api = sig$.composeApi({ nodeHost: 'https://europe.signum.network', }); const account = await api.account.getAccount({accountId: '16107620026796983538'}); console.log('Account', account); })(); ``` {% endcode %} {% hint style="info" %} The modules are bundled using [IIFE](https://developer.mozilla.org/en-US/docs/Glossary/IIFE), to avoid global naming collisions with your application. Keep also in mind, that the bundles do not contain any type information, so your IDE cannot help you with auto-completion. {% endhint %} Each module of SignumJS comes with its own *namespace*
ModuleNamespaceExample
coresig$
const api = sig$.composeApi({
        nodeHost: 'https://europe.signum.network',
    });
contractssig$contracts

const dataView = new sig$contracts.ContractDataView(contract)
cryptosig$crypto

const hash = sig$crypto.hashSHA256("test")
httpsig$http

const client = new sig$http.HttpClientFactory.createHttpClient('https://jsonplaceholder.typicode.com/');
monitorsig$monitor

const monitor = new sig$monitor.Monitor<Account>({
    asyncFetcherFn: tryFetchAccount,
    compareFn: checkIfAccountExists,
    intervalSecs: 10, 
        key: 'monitor-account',
    timeoutSecs: 2 * 240 
})
utilsig$util

const value = sig$util.Amount.fromSigna("1000")
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