Fuel TS SDK

⌘K

Address Conversion

Icon LinkAddress

Addresses and varying address formats are commonplace when interacting with decentralized applications. Furthermore, different networks may enforce different address formats.

The Fuel Network uses the Bech32 address format for its interactions, an example of which can be seen below:

const bech32 =
  'fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs';

Icon InfoCircle
[!NOTE] Note Bech32 addresses like fuel1.. are now deprecated. Use B256 addresses instead. (help Icon Link)

However, a hexlified Bits256 (hex) is another common address format; an example can be seen below:

const b256Address =
  '0xbebd3baab326f895289ecbd4210cf886ce41952316441ae4cac35f00f0e882a6';

At times, these can even be wrapped in a Struct . Such as an Asset ID or a EVM Address :

const evmAddress: EvmAddress = {
  bits: '0x000000000000000000000000210cf886ce41952316441ae4cac35f00f0e882a6',
};

The TS-SDK makes converting between these addresses simple using the Address helper, which provides various utilities for conversion.

The following conversion guide will show how to utilize this class to convert between address formats, as well as Sway Standard Types.

Icon LinkAddress Conversion

This guide demonstrates how to convert between address formats and Sway Standard Types using helper functions. Native types are wrappers for bytes, and you can perform conversions between them by leveraging these functions and classes.

Icon LinkFrom `Bech32` to `b256`

By instantiating an Address Icon Link, we can validate a Bech32 address and easily convert it to a b256:

import type { B256Address, Bech32Address } from 'fuels';
import { Address } from 'fuels';
 
const bech32: Bech32Address =
  'fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs';
 
const address: Address = Address.fromDynamicInput(bech32);
 
const b256: B256Address = address.toB256();
// 0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f

Or, if you'd prefer to use utility functions directly for validation and conversion, you can use isBech32 and toB256:

import type { B256Address, Bech32Address } from 'fuels';
import { isBech32, toB256 } from 'fuels';
 
const bech32: Bech32Address =
  'fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs';
 
const b256: B256Address | null = isBech32(bech32) ? toB256(bech32) : null;
// 0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f

Icon LinkFrom `b256` to `Bech32`

In a similar fashion, we have both class functions on the Address Icon Link and utilities available for b256 validation and conversion:

import type { B256Address, Bech32Address } from 'fuels';
import { Address } from 'fuels';
 
const b256: B256Address =
  '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f';
 
const address: Address = Address.fromDynamicInput(b256);
 
const bech32: Bech32Address = address.bech32Address;
// fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs

And by using the isB256 and toBech32 utilities:

import { isB256, toBech32 } from 'fuels';
 
const b256 =
  '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f';
const bech32 = isB256(b256) ? toBech32(b256) : null;
// fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs

Icon LinkConverting a Contract ID

The Contract id property has the AbstractAddress type. Therefore, it can be converted using the Address Icon Link class functions such as toAddress and toB256:

import type { Bech32Address } from 'fuels';
import { Address, Provider, Contract } from 'fuels';
 
import { LOCAL_NETWORK_URL } from '../../../../env';
import { Counter } from '../../../../typegend/contracts';
 
const provider = await Provider.create(LOCAL_NETWORK_URL);
 
const contractAbi = Counter.abi;
const contractAddress = Address.fromB256(
  '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f'
);
 
const contract = new Contract(contractAddress, contractAbi, provider);
 
const bech32: Bech32Address = contract.id.toAddress();
// fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs

Icon LinkConverting a Wallet Address

Similarly, the Wallet address property is also of type AbstractAddress and can therefore use the same Address Icon Link class functions for conversion:

import type { Bech32Address, WalletLocked } from 'fuels';
import { Address, Provider, Wallet } from 'fuels';
 
import { LOCAL_NETWORK_URL } from '../../../../env';
 
const provider = await Provider.create(LOCAL_NETWORK_URL);
 
const address = Address.fromB256(
  '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f'
);
 
const wallet: WalletLocked = Wallet.fromAddress(address, provider);
 
const bech32: Bech32Address = wallet.address.toAddress();
// fuel1d5cfwekq78r0zq73g7eg0747etkaxxltrqx5tncm7lvg89awe3hswhqjhs

Icon LinkConverting an Asset ID

Asset IDs are a wrapped b256 value. The following example shows how to create an Address Icon Link from a b256 type:

import type { AssetId, B256Address } from 'fuels';
import { Address } from 'fuels';
 
const b256: B256Address =
  '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f';
const address: Address = Address.fromB256(b256);
const assetId: AssetId = address.toAssetId();
// {
//    bits: '0x6d309766c0f1c6f103d147b287fabecaedd31beb180d45cf1bf7d88397aecc6f
// }