---
title: "Nimiq Utils"
description: "Production-ready JavaScript utilities for blockchain development. Battle-tested, type-safe, and tree-shakable."
canonical_url: "https://nimiq.dev/nimiq-utils"
---
# Nimiq Utils
> Production-ready JavaScript utilities for blockchain development. Battle-tested, type-safe, and tree-shakable.
```ts [address-validation.ts]
import { ValidationUtils } from '@nimiq/utils'
// Validate Nimiq address format
ValidationUtils.isValidAddress('NQ48 8CKH BA24...')
// → true
// Check if it's a user-friendly address
ValidationUtils.isUserFriendlyAddress('NQ48 8CKH BA24...')
// → true
```
```ts [address-conversion.ts]
import { AddressBook } from '@nimiq/utils'
// Convert between address formats
const userFriendly = 'NQ48 8CKH BA24 Y7R5 GXM9 PQ8R HHGJ'
const hex = AddressBook.toHex(userFriendly)
// → '84c8e...'
// Convert back to user-friendly
const address = AddressBook.fromHex(hex)
// → 'NQ48 8CKH BA24 Y7R5 GXM9 PQ8R HHGJ'
```
```ts [currency-formatting.ts]
import { FormattableNumber } from '@nimiq/utils'
// Format NIM amounts
const amount = new FormattableNumber(1.5, 5)
amount.toString() // → "1.50000"
amount.toCurrency('NIM') // → "1.50 NIM"
// Auto-format with locale
amount.toLocaleString() // → "1.50000"
```
```ts [fiat-rates.ts]
import { getExchangeRates } from '@nimiq/utils'
// Get current exchange rates
const rates = await getExchangeRates(['nim'], ['usd', 'eur'])
// → { nim: { usd: 0.012, eur: 0.011 } }
// Calculate fiat value
const nimValue = 100
const usdValue = nimValue * rates.nim.usd
```
```ts [supply-calculator.ts]
import { posSupplyAt } from '@nimiq/utils'
// Get total supply at specific time
const supply = posSupplyAt(Date.now())
// → 3000000000 (in smallest unit)
// Get supply at block height
const supplyAtBlock = posSupplyAt(1000000)
```
## Sitemap
See the full [sitemap](https://nimiq.dev/sitemap.md) for all pages.