TypeScript SDK: AccountAddress

Purpose

Guide correct creation, parsing, and formatting of account addresses in @aptos-labs/ts-sdk. Addresses are 32-byte

values; string format follows AIP-40.

ALWAYS

1. Use AccountAddress.from() for flexible input – accepts string (with or without 0x), Uint8Array, or existing

AccountAddress.

1. Use addresses as AccountAddress or string in API – SDK accepts AccountAddressInput (string or

AccountAddress) in most APIs.

1. Use AccountAddress.fromStringStrict() / AccountAddress.fromStrict() when you need AIP-40 strict: LONG (0x +

64 hex chars) or SHORT only for special (0x0–0xf).

1. Use derived address helpers from the SDK for object/resource/token addresses – do not hand-roll hashing.

NEVER

1. Do not use raw strings for comparison – use addr.equals(other) or normalize with AccountAddress.from().
2. Do not assume SHORT form for non-special addresses – non-special addresses must be LONG (64 hex chars) in strict

mode.

1. Do not use the Hex class for account addresses – use AccountAddress only (per SDK docs).

Address format (AIP-40)

• Length: 32 bytes (64 hex chars in LONG form).
• String: Must start with 0x. LONG = 0x + 64 hex chars; SHORT = shortest form (e.g. 0x1, 0xf).
• Special addresses: 0x0–0xf (last byte < 16, rest zero). These may be written in SHORT form (0x1, 0xa).
• Reference: AIP-40.

Creating AccountAddress

From string (recommended: relaxed)

import { AccountAddress } from "@aptos-labs/ts-sdk";

// Relaxed: accepts with or without 0x, SHORT or LONG
const addr1 = AccountAddress.from("0x1");
const addr2 = AccountAddress.from("0xaa86fe99004361f747f91342ca13c426ca0cccb0c1217677180c9493bad6ef0c");
const addr3 = AccountAddress.from("1"); // no 0x ok

From string (strict AIP-40)

// Strict: LONG (0x + 64 chars) or SHORT only for special (0x0–0xf)
const addrStrict = AccountAddress.fromStringStrict(
  "0x0000000000000000000000000000000000000000000000000000000000000001"
);
// Or use fromStrict for any AccountAddressInput
const a = AccountAddress.fromStrict("0x1"); // ok: special address in SHORT form

From bytes

const bytes = new Uint8Array(32);
bytes[31] = 1;
const addr = new AccountAddress(bytes);
// or
const addrFrom = AccountAddress.from(bytes);

Built-in constants

AccountAddress.ZERO; // 0x0
AccountAddress.ONE; // 0x1
AccountAddress.TWO; // 0x2
AccountAddress.THREE; // 0x3
AccountAddress.FOUR; // 0x4
AccountAddress.A; // 0xa

String output

const addr = AccountAddress.from("0x1");
addr.toString(); // "0x1"
addr.toStringLong(); // "0x0000...0001" (64 chars after 0x)

Validation

const result = AccountAddress.isValid({
  input: "0x1",
  strict: false
});
if (result.valid) {
  // use address
} else {
  console.log(result.invalidReason, result.invalidReasonMessage);
}

Derived addresses (object / resource / token / user-derived)

Import from @aptos-labs/ts-sdk (via core):

import {
  AccountAddress,
  createObjectAddress,
  createResourceAddress,
  createTokenAddress,
  createUserDerivedObjectAddress
} from "@aptos-labs/ts-sdk";

Object address (e.g. named object)

const creator = AccountAddress.from("0x120e79e45d21ef439963580c77a023e2729db799e96e61f878fac98fde5b9cc9");
const seed = "migration::migration_contract"; // or Uint8Array
const objectAddr = createObjectAddress(creator, seed);
// objectAddr.toString() => deterministic 0x... address

Resource account address

const creator = AccountAddress.from("0x41e724e1d4fce6472ffcb5c9886770893eb49489e3f531d0aa97bf951e66d70c");
const seed = "create_resource::create_resource";
const resourceAddr = createResourceAddress(creator, seed);

Token (NFT) object address

const creator = AccountAddress.from("0x9d518b9b84f327eafc5f6632200ea224a818a935ffd6be5d78ada250bbc44a6");
const collectionName = "SuperV Villains";
const tokenName = "Nami #5962";
const tokenAddr = createTokenAddress(creator, collectionName, tokenName);
// Internally: seed = `${collectionName}::${tokenName}` -> createObjectAddress(creator, seed)

User-derived object address

const sourceAddress = AccountAddress.from("0x653a60dab27fe8f3859414973d218e1b7551c778a8650a7055a85c0f8041b2a4");
const deriveFromAddress = AccountAddress.from("0xa");
const userDerivedAddr = createUserDerivedObjectAddress(sourceAddress, deriveFromAddress);

Equality and serialization

const a = AccountAddress.from("0x1");
const b = AccountAddress.from("0x0000000000000000000000000000000000000000000000000000000000000001");
a.equals(b); // true

// BCS: use serializer or SDK entry/script helpers in transaction building

Common mistakes

References

• SDK: src/core/accountAddress.ts, src/core/account/utils/address.ts
• AIP-40: https://github.com/aptos-foundation/AIPs/blob/main/aips/aip-40.md
• Pattern: TYPESCRIPT_SDK.md