javascript

Symbol-SDK

This is minimal Javascript SDK for Symbol and NEM. The architecture and programming paradigm of this SDK are consistent with those for other languages. Old typescript SDK - symbol-sdk v2.0.0 - has been deprecated.

Note, at this point NEM support should be considered experimental.

SDK

NEM and Symbol features are grouped under facades.

1. Transactions can be created using so called 'descriptors'.

Symbol:

const { SymbolFacade } = require('symbol-sdk').facade;
...
const facade = new SymbolFacade('testnet');
const transaction = facade.transactionFactory.create({
	type: 'transfer_transaction',
	signerPublicKey: '87DA603E7BE5656C45692D5FC7F6D0EF8F24BB7A5C10ED5FDA8C5CFBC49FCBC8',
	fee: 1000000n,
	deadline: 41998024783n,
	recipientAddress: 'TCHBDENCLKEBILBPWP3JPB2XNY64OE7PYHHE32I',
	mosaics: [
		{ mosaicId: 0x7CDF3B117A3C40CCn, amount: 1000000n }
	]
});

NEM:

const { NemFacade } = require('symbol-sdk').facade;
...
const facade = new NemFacade('testnet');

const transaction = facade.transactionFactory.create({
	type: 'transfer_transaction_v1',
	signerPublicKey: 'A59277D56E9F4FA46854F5EFAAA253B09F8AE69A473565E01FD9E6A738E4AB74',
	fee: 0x186A0n,
	timestamp: 191205516,
	deadline: 191291916,
	recipientAddress: 'TALICE5VF6J5FYMTCB7A3QG6OIRDRUXDWJGFVXNW',
	amount: 5100000n
});

2. Signature should always be attached via transaction factory, sample:

const privateKey = new PrivateKey('EDB671EB741BD676969D8A035271D1EE5E75DF33278083D877F23615EB839FEC');
const signature = facade.signTransaction(new NemFacade.KeyPair(privateKey), transaction);

const jsonPayload = facade.transactionFactory.constructor.attachSignature(transaction, signature);

jsonPayload can then be pushed to appropriate REST endpoints:

• nem: POST /transaction/announce
• symbol: PUT /transactions

3. NEM transaction names are aligned with the names used in catapult schemas catapult schemas.

Cheat sheet:

"old" name (used in docs)	descriptor name
ImportanceTransfer transaction	account_key_link_transaction
MosaicDefinitionCreation transaction	mosaic_definition_transaction
MosaicSupplyChange transaction	mosaic_supply_change_transaction
MultisigAggregateModification transaction	multisig_account_modification_transaction_v1
MultisigAggregateModification transaction	multisig_account_modification_transaction
MultisigSignature transaction or Cosignature transaction	cosignature
Multisig transaction	multisig_transaction
ProvisionNamespace transaction	namespace_registration_transaction
Transfer transaction	transfer_transaction_v1
Transfer transaction	transfer_transaction