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README.md

IOTA Client Library - Node.js binding

Node.js binding to the IOTA client library.

Installation

Using NPM:

$ npm i @iota/client

Using yarn:

$ yarn add @iota/client

Requirements

One of the following Node.js version: '10.x', '12.x', '14.x', '15.x', '16.x'

Getting Started

After you linked the library, you can create a Client instance and interface with it.

const { ClientBuilder } = require('@iota/client')
const client = new ClientBuilder()
    .node('https://api.lb-0.testnet.chrysalis2.com')
    .build()
client.getInfo().then(console.log).catch(console.error)

Connecting to a MQTT broker using raw ip doesn't work. This is a limitation of rustls.

API Reference

ClientBuilder

node(url): ClientBuilder

Adds an IOTA node to the client pool.

Param	Type	Description
url	`string`	A node URL

Returns the client builder instance for chained calls.

nodeAuth(url, authOptions): ClientBuilder

Adds an IOTA node with authentication to the client pool.

Param	Type	Description
url	`string`	A node URL
authOptions	`NodeAuthOptions`	Options for node authentication

Returns the client builder instance for chained calls.

primaryNode(url, [, authOptions]): ClientBuilder

Add a node to always connect first to with optional authentication.

Param	Type	Description
url	`string`	A node URL
authOptions	`NodeAuthOptions`	Options for node authentication

Returns the client builder instance for chained calls.

primaryPowNode(url, [, authOptions]): ClientBuilder

Add a node to always connect first to when using remote PoW with optional authentication. Will overwrite the primary node for this case.

Param	Type	Description
url	`string`	A node URL
authOptions	`NodeAuthOptions`	Options for node authentication

Returns the client builder instance for chained calls.

nodes(urls): ClientBuilder

Adds a list of IOTA nodes to the client pool.

Param	Type	Description
url	`string[]`	An array of node URLs

Returns the client builder instance for chained calls.

nodePoolUrls(urls): ClientBuilder

Adds a list of IOTA nodes from node pool URLs to the client pool.

Param	Type	Description
url	`string[]`	An array of node pool URLs

Returns the client builder instance for chained calls.

network(networkName): ClientBuilder

Set a network to get default nodes for it. Can be "testnet" or "mainnet". Nodes that don't belong to this network are ignored.

Param	Type	Description
networkName	`string`	The network

Returns the client builder instance for chained calls.

quorum(enabled): ClientBuilder

Defines how many of nodes will be queried at the same time to check for quorum.

Param	Type	Description
enabled	`boolean`	Define if quourm should be used or not

Returns the client builder instance for chained calls.

quorumSize(size): ClientBuilder

Defines how many of nodes will be queried at the same time to check for quorum.

Param	Type	Description
size	`number`	The number of nodes that will be queried

Returns the client builder instance for chained calls.

quorumThreshold(threshold): ClientBuilder

Defines the minimum amount of nodes from the quorum pool that need to agree if we want to consider the result true.

Param	Type	Description
threshold	`number`	Minimum amount of nodes

Returns the client builder instance for chained calls.

brokerOptions(options): ClientBuilder

Sets the options for the MQTT connection with the node.

Param	Type	Description
options	`BrokerOptions`	The MQTT broker options

Returns the client builder instance for chained calls.

nodeSyncInterval(interval): ClientBuilder

Sets the node syncing interval.

Param	Type	Description
interval	`number`	The interval for the node syncing process

Returns the client builder instance for chained calls.

disableNodeSync(): ClientBuilder

Disables the node syncing process. Every node will be considered healthy and ready to use.

Returns the client builder instance for chained calls.

requestTimeout(timeoutMs): ClientBuilder

Sets the default HTTP request timeout.

Param	Type	Description
timeout	`number`	The timeout in milliseconds

Returns the client builder instance for chained calls.

apiTimeout(api, timeoutMs): ClientBuilder

Sets the HTTP request timeout for the specified API.

Param	Type	Description
api	`'GetHealth' \| 'GetInfo' \| 'GetTips' \| 'PostMessage' \| 'GetOutput' \| 'GetMilestone'`	The API to set the request timeout
timeout	`number`	The timeout in milliseconds

Returns the client builder instance for chained calls.

localPow(local): ClientBuilder

Sets the PoW type.

Param	Type	Description
local	`boolean`	Flag determining if PoW should be done locally or remotely

Returns the client builder instance for chained calls.

build(): Client

Builds the client instance.

Returns a Client instance.

Client

networkInfo(): NetworkInfo

Gets the cached network info.

Returns a NetworkInfo instance.

subscriber(): TopicSubscriber

Gets a handle to the MQTT topic subscriber.

Returns a TopicSubscriber instance.

message(): MessageSender

Initiates the builder to send messages.

Returns a MessageSender instance.

getUnspentAddress(seed): UnspentAddressGetter

Get a valid unspent address.

Param	Type	Description
seed	`string`	The hex-encoded seed to search

Returns a UnspentAddressGetter instance.

getAddresses(seed): AddressGetter

Find addresses from the seed regardless of their validity.

Param	Type	Description
seed	`string`	The hex-encoded seed to search

Returns a AddressGetter instance.

findMessages(indexationKeys, messageIds): Promise<Message[]>

Finds all messages associated with the given indexation keys and message ids.

Param	Type	Description
indexationKeys	`string[]`	The list of indexations keys too search
messageIds	`string[]`	The list of message ids to search

Returns a promise resolving to the list of the found messages.

getBalance(seed: string): BalanceGetter

Get balance on a given seed and its wallet account index.

Param	Type	Description
seed	`string`	The hex-encoded seed to search

Returns a BalanceGetter instance.

getAddressBalances(addresses): Promise<AddressBalance[]>

Get the balance in iotas for the given addresses.

Param	Type	Description
addresses	`string[]`	The list of addresses to search

Returns A promise resolving to the list of { address, balance } pairs.

generateMnemonic()

Returns a random generated Bip39 mnemonic with the English word list.

Returns A String

mnemonicToHexSeed(mnemonic)

Returns the seed hex encoded.

Param	Type	Description
mnemonic	`string`	Bip39 mnemonic with words from the English word list.

Returns A String

bech32ToHex(bech32)

Returns a parsed hex String from bech32.

Param	Type	Description
bech32	`string`	The address Bech32 string

Returns A String

hexToBech32(hex, bech32_hrp (optional))

Returns a parsed bech32 String from hex.

Param	Type	Description
bech32	`string`	The address Bech32 string
bech32_hrp	`string`	The Bech32 hrp string

Returns A String

isAddressValid(address: string): boolean

Checks if a given address is valid.

Param	Type	Description
address	`string`	The address Bech32 string

Returns A boolean.

retry(messageId: string): Promise

Retries (promotes or reattaches) the message associated with the given id.

Param	Type	Description
messageId	`string`	The id of the message to retry

Returns A promise resolving to the new Message instance.

retryUntilIncluded(messageId: string[, interval: int, maxAttempts: int]): Promise

Retries (promotes or reattaches) the message associated with the given id until it's included in the Tangle. Default interval is 5 seconds and max_attempts is 10.

Param	Type	Description
messageId	`string`	The id of the message to retry
[options.interval]	`int`	The interval in seconds in which we retry the message.
[options.maxAttempts]	`int`	The maximum of attempts we retry the message.

Returns the message ids and Message of reattached messages.

consolidateFunds(seed: string, accountIndex: int, startIndex: int, endIndex: int): Promise

Function to consolidate all funds from a range of addresses to the address with the lowest index in that range

Param	Type	Description
seed	`string`	The seed
accountIndex	`int`	The account index.
startIndex	`int`	The lowest address index, funds will be consolidated to this address.
endIndex	`int`	The address index until which funds will be consolidated

Returns the address to which the funds got consolidated, if any were available.

getInfo(): Promise

Gets information about the node.

Returns a promise resolving to the NodeInfoWrapper object.

getTips(): Promise<[string, string]>

Gets two non-lazy tips.

Returns a promise resolving to an array of length 2 containing the message ids of the tips.

postMessage(message): Promise

Submits a message.

Param	Type	Description
message	`MessageDto`	The message to submit

Returns the message identifier.

getMessage(): MessageFinder

Gets a message from its identifier.

Returns an instance of the MessageFinder for choices of response.

getOutput(outputId): Promise

Gets the UTXO outputs associated with the given output id.

Param	Type	Description
outputId	`string`	The id of the output to search

Returns a promise resolving to the associated OutputMetadata.

findOutputs(outputIds, addresses): Promise<OutputMetadata[]>

Gets the UTXO outputs associated with the given output ids and addresses.

Param	Type	Description
addresses	`string[]`	The list of addresses to search
outputIds	`string[]`	The list of output ids to search

Returns a promise resolving to a list of OutputMetadata.

getAddressOutputs(address[, options]): Promise<string[]>

Gets the UTXO outputs associated with the given address.

Param	Type	Description
address	`string`	The address Bech32 string
[options.includeSpent]	`boolean`	Whether the query should include spent outputs or not
[options.outputType]	`'SignatureLockedSingle' \| 'SignatureLockedDustAllowance'`	The output type filter

Returns a promise resolving to a list of output ids.

getAddressBalance(address): Promise

Gets the balance of the given address.

Param	Type	Description
address	`string`	The address Bech32 string

getMilestone(index): Promise

Gets the milestone by the given index.

Param	Type	Description
index	`number`	The index of the milestone

Returns a promise resolving to the MilestoneMetadata.

getMilestoneUtxoChanges(index): Promise

Gets the utxo changes by the given milestone index.

Param	Type	Description
index	`number`	The index of the milestone

Returns a promise resolving to the MilestoneUTXOChanges.

getReceipts(): Promise<Receipts[]>

Get all receipts.

Returns a promise resolving to the Receipts.

getReceiptsMigratedAt(index): Promise<Receipts[]>

Get all receipts for a given milestone index

Param	Type	Description
index	`number`	The index of the milestone

Returns a promise resolving to the Receipts.

getTreasury(): Promise

Get the treasury amount.

Returns a promise resolving to the Treasury.

getIncludedMessage(): Promise

Get the included message of a transaction.

Param	Type	Description
index	`string`	The id of the transaction

Returns A promise resolving to the new Message instance.

reattach(messageId): Promise

Reattaches the message associated with the given id.

Param	Type	Description
messageId	`string`	The id of the message to reattach

Returns A promise resolving to the new Message instance.

promote(messageId): Promise

Promotes the message associated with the given id.

Param	Type	Description
messageId	`string`	The id of the message to promote

Returns A promise resolving to the new Message instance.

NetworkInfo

Field	Type	Description
network	`string`	The network
networkId	`number`	The network hashed
bech32HRP	`string`	Bech32 HRP for this network
minPoWScore	`number`	The network's minimum score for PoW
localPow	`boolean`	Whether we are using local PoW or not

TopicSubscriber

Possible topics:

milestones/latest
milestones/confirmed

messages
messages/referenced
messages/indexation/{index}
messages/{messageId}/metadata
transactions/{transactionId}/included-message

outputs/{outputId}

addresses/{address}/outputs
addresses/ed25519/{address}/outputs

topic(topic): TopicSubscriber

Adds a topic to this manager instance.

Param	Type	Description
topic	`string`	A MQTT topic

Returns the topic subscriber instance for chained calls.

topics(topic): TopicSubscriber

Adds a list of topics to this manager instance.

Param	Type	Description
topics	`string[]`	An array of MQTT topics

Returns the topic subscriber instance for chained calls.

subscribe(cb): TopicSubscriber

Subscribe to the provided topics.

Param	Type	Description
cb	`function`	The topic handler callback in the form of `(err, message) => {}`

Returns the topic subscriber instance for chained calls.

unsubscribe(cb: Callback): TopicSubscriber

Unsubscribes from the provided topics.

Param	Type	Description
cb	`function`	A callback executed when the unsubscribe is finished in the form of `(err, message) => {}`

Returns the topic subscriber instance for chained calls.

MessageSender

Builder to create and submit messages to the Tangle.

index(index): MessageSender

Sets the message indexation. This field is required for indexation payloads.

Param	Type	Description
index	`string`	number[]

Returns the message submit instance for chained calls.

data(data): MessageSender

Sets the indexation data.

Param	Type	Description
data	`string`	Uint8Array

Returns the message submit instance for chained calls.

seed(seed): MessageSender

Sets the transaction account seed. This field is required for transaction payloads.

Param	Type	Description
seed	`string`	The hex-encoded seed of the account to spend

Returns the message submit instance for chained calls.

parents(messageId): MessageSender

Sets 1-8 custom parent message ids.

Param	Type	Description
messageId	`string[]`	The parents message ids

Returns the message submit instance for chained calls.

accountIndex(index): MessageSender

Sets the account index. This field is required for transactions.

Param	Type	Description
index	`number`	The account index

Returns the message submit instance for chained calls.

input(transactionId, index): MessageSender

Adds an output to the transaction.

Param	Type	Description
transactionId	`string`	The transaction id
index	`number`	The input index

Returns the message submit instance for chained calls.

inputRange(start, end): MessageSender

Defines the range in which to search for addresses fro custom inputs.

Param	Type	Description
start	`number`	The start index
end	`number`	The end index

Returns the message submit instance for chained calls.

output(address, amount): MessageSender

Adds an output to the transaction.

Param	Type	Description
address	`string`	The output address
amount	`number`	The output amount

Returns the message submit instance for chained calls.

dustAllowanceOutput(address, amount): MessageSender

Adds a dust allowance output to the transaction.

Param	Type	Description
address	`string`	The output address
amount	`number`	The output amount

Returns the message submit instance for chained calls.

initialAddressIndex(index): MessageSender

Sets the initial address index to search for balance. Defaults to 0 if the function isn't called.

Param	Type	Description
index	`number`	The initial address index

Returns the message submit instance for chained calls.

submit(): Promise

Submits the message.

Returns a promise resolving to the message identifier.

UnspentAddressGetter

Gets a valid unspent address associated with the seed.

accountIndex(index): UnspentAddressGetter

Sets the account index. This field is required.

Param	Type	Description
index	`number`	The account index

Returns the address getter instance for chained calls.

initialAddressIndex(index): UnspentAddressGetter

Sets the initial address index. Defaults to 0 if the function isn't called.

Param	Type	Description
index	`number`	The initial address index

Returns the address getter instance for chained calls.

get(): Promise<[Address, number]>

Performs the operation.

Returns a promise resolving to the Address instance and its index.

AddressGetter

Generates addresses with a given seed.

accountIndex(index): AddressGetter

Sets the account index. This field is required.

Param	Type	Description
index	`number`	The account index

Returns the address finder instance for chained calls.

range(start, end): AddressGetter

Defines the range of addresses to get. Defaults to 0..20 if the function isn't called.

Param	Type	Description
start	`number`	The first address index
end	`number`	The last address index

Returns the address finder instance for chained calls.

includeInternal(): AddressGetter

Defines that public and internal address will be returned instead of only public addresses.

Returns the address finder instance for chained calls.

bech32Hrp(bech32Hrp): AddressGetter

Defines the bech32Hrp for the bech32 encoded addresses, required when generating addresses offline(with disableNodeSync()).

Param	Type	Description
bech32Hrp	`string`	The bech32Hrp for the addresses

Returns the address finder instance for chained calls.

get(): Address[] | [Address, bool][]

Performs the operation.

Returns an array of public Address instances or an array of arrays with an Address and a bool, where the bool defines whether it's an internal address or not.

BalanceGetter

Gets balance on a given seed.

accountIndex(index): BalanceGetter

Sets the account index. This field is required.

Param	Type	Description
index	`number`	The account index

Returns the balance getter instance for chained calls.

initialAddressIndex(index): BalanceGetter

Sets the initial address index. Defaults to 0 if the function isn't called.

Param	Type	Description
index	`number`	The initial address index

Returns the balance getter instance for chained calls.

gapLimit(amount): BalanceGetter

Sets the gapLimit to specify how many addresses will be checked each round. If gapLimit amount of addresses in a row have no balance the BalanceGetter will return. Defaults to 20 if the function isn't called.

Param	Type	Description
gapLimit	`number`	The initial address index

Returns the balance getter instance for chained calls.

get(): Promise

Performs the operation.

Returns a promise resolving to the account balance.

MessageFinder

Gets a message by indexation key or identifier.

initialAddressIndex(index): Promise<string[]>

Param	Type	Description
index	`string`	The indexation key

Gets a list of message identifiers associated with the given indexation key.

Returns a promise resolving to the list of associated ids.

data(id): Promise

Gets the message object associated with the given identifier.

Param	Type	Description
id	`string`	The message identifier

Returns a Message object.

raw(id): Promise

Gets the message raw data.

Param	Type	Description
id	`string`	The message identifier

Returns the message raw data as string.

children(id): Promise<string[]>

Gets the children of the given message.

Param	Type	Description
id	`string`	The message identifier

Returns the list of message ids of the message children.

metadata(id): Promise

Gets the metadata of the given message.

Param	Type	Description
id	`string`	The message identifier

Returns a MessageMetadata object.

BrokerOptions

All fields are optional.

Field	Type	Description
automaticDisconnect	`boolean`	Whether the MQTT broker should be automatically disconnected when all topics are unsubscribed or not.
timeout	`number`	MQTT connection timeout in secods
useWs	`boolean`	Defines if websockets should be used (true) or TCP (false)
maxReconnectionAttempts	`number`	Defines the maximum reconnection attempts before it returns an error
port	`number`	Defines the port to be used for the MQTT connection

NodeAuthOptions

Field	Type	Description
jwt	`string`	Optional JSON Web Token.
basicAuthName	`string`	Optional name for basic authentication
basicAuthPassword	`string`	Optional password for basic authentication

Address

Field	Type	Description
data	`string`	Address as a Bech32 string

Message

Field	Type	Description
networkId	`number`	Network identifier
parents	`string[]`	Message ids of the message references
payload	`Payload`	Message payload
nonce	`number`	Message nonce

MessageWrapper

Field	Type	Description
message	`Message`	Message
messageId	`string`	The message id

Payload

Field	Type	Description
data	`{ type: 'Transaction', data: TransactionPayload } \| { type: 'Indexation', data: IndexationPayload } \| { type: 'Milestone', data: MilestonePayload}`	Payload data

TransactionPayload

Field	Type	Description
essence	`TransactionPayloadEssence`	Transaction essence
unlock_blocks	`UnlockBlock[]`	Unlock blocks

TransactionPayloadEssence

Field	Type	Description
inputs	`Input[]`	Inputs
outputs	`Output[]`	Outputs
payload	`Payload \| undefined`	Payload for chaining

Input

Field	Type	Description
type	`'UTXO'`	Input type identifier
data	`string`	The associated output id

Output

Field	Type	Description
type	`'SignatureLockedSingle'`	Output type identifier
data	`{ address: string, amount: number }`	The output definition

UnlockBlock

Field	Type	Description
type	`'Signature' \| 'Reference'`	Unlock block type identifier
data	`Ed25519SignatureUnlockBlock \| number`	Unlock block data (signature type or reference index)

Ed25519SignatureUnlockBlock

Field	Type	Description
public_key	`number[]`	Ed25519 public key
signature	`number[]`	Ed25519 signature

IndexationPayload

Field	Type	Description
index	`string`	Indexation key
data	`number[]`	Indexation data as byte array

MilestonePayload

Field	Type	Description
essence	`MilestoneEssence`	Milestone essence
signatures	`number[][]`	Milestone signatures

MilestoneEssence

Field	Type	Description
index	`number`	Milestone index
timestamp	`number`	Timestamp
parents	`string[]`	Message ids of the messages the milestone references
merkleProof	`number[]`	Merkle proof
nextPoWScore	`number`	Next PoW score
nextPoWScoreMilestoneIndex	`number`	Milestone index at which the nextPoWScore will be used
publicKeys	`number[][]`	public keys

MessageDto

Field	Type	Description
parents	`string[] \| undefined`	Message ids of the messages it references. `getTips` is used by default
payload	`PayloadDto`	Message payload

PayloadDto

Field	Type	Description
data	`TransactionPayloadDto \| IndexationPayloadDto`	Payload data

TransactionPayloadDto

Field	Type	Description
essence	`TransactionPayloadEssenceDto`	Transaction essence
unlockBlocks	`UnlockBlockDto[]`	Unlock blocks

TransactionPayloadEssenceDto

Field	Type	Description
inputs	`string[]`	Inputs
outputs	`Output[]`	Outputs
payload	`PayloadDto \| undefined`	Payload for chaining

OutputDto

Field	Type	Description
address	`string`	Output address
amount	`amount`	Output amount

UnlockBlockDto

Field	Type	Description
data	`Ed25519SignatureUnlockBlockDto \| number`	Unlock block data (signature type or reference index)

Ed25519SignatureUnlockBlockDto

Field	Type	Description
publicKey	`number[]`	Ed25519 public key
signature	`number[]`	Ed25519 signature

IndexationPayloadDto

Field	Type	Description
index	`string`	Indexation key
data	`Uint8Array`	Indexation data

AddressBalance

Field	Type	Description
address	`string`	Bech32 encoded address
balance	`number`	Address balance
dustAllowed	`boolean`	Dust allowed

MessageMetadata

Field	Type	Description
messageId	`string`	Message identifier
parents	`string[]`	Message id of the messages it references
isSolid	`boolean`	Message solid state
shouldPromote	`boolean \| undefined`	Indicates whether the message should be promoted or not
shouldReattach	`boolean \| undefined`	Indicates whether the message should be reattached or not
referencedByMilestoneIndex	`number \| undefined`	Index of the milestone that references this message
ledgerInclusionState	`string \| undefined`	Ledger inclusion state

NodeInfoWrapper

Field	Type	Description
url	`string`	Node url
nodeinfo	`NodeInfo`	NodeInfo

NodeInfo

Field	Type	Description
name	`string`	Node name
version	`string`	Node version
isHealthy	`boolean`	Node health status
networkId	`string`	Node network identifier
bech32HRP	`string`	Bech32 HRP for this network
minPoWScore	`number`	Min PoW score
messagesPerSecond	`number`	Network stats: Messages per second in the network
referencedMessagesPerSecond	`number`	Network stats: Referenced messages per second
referencedRate	`number`	Network stats: referenced rate
latestMilestoneTimestamp	`number`	Timestamp of the latest milestone
latestMilestoneIndex	`number`	Index of the latest milestone
confirmedMilestoneIndex	`number`	Index of the confirmed milestone
pruningIndex	`number`	Pruning index
features	`string[]`	List of node features

OutputMetadata

Field	Type	Description
messageId	`string`	Id of the message associated with the output
transactionId	`string`	Id of the transaction associated with the output
outputIndex	`number`	Output index
isSpent	`boolean`	Output spent state
address	`string`	Output address
amount	`number`	Output amount

MilestoneMetadata

Field	Type	Description
milestoneIndex	`number`	Milestone index
messageId	`string`	Id of the message associated with the milestone
timestamp	`number`	Milestone timestamp

MilestoneUTXOChanges

Field	Type	Description
index	`number`	Milestone index
createdOutputs	`string[]`	OutputIds from new created outputs
consumedOutputs	`string[]`	OutputIds from consumed outputs

Receipts

Field	Type	Description
receipt	`receipt`	Receipt
milestoneIndex	`number`	Milestone index

Treasury

Field	Type	Description
milestoneId	`string`	Milestone id
amount	`number`	Amount