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On this page
  • defaultAccount
  • accountCreated
  • getAccount
  • getAccounts
  • getAccountKey
  • getBalance
  • getCode
  • getTransactionCount
  • isContractAccount
  • sign
  1. -
  2. dApp Developers
  3. SDK & Libraries for interacting with Klaytn Node
  4. caver-js
  5. caver-js ~v1.4.1
  6. API references
  7. caver.klay

Account

Previouscaver.klayNextBlock

Last updated 2 years ago

defaultAccount

caver.klay.defaultAccount

This default address is used as the default from property, if no from property is specified in parameters of the following methods:

  • ->

  • ->

Property

20-byte String - Any Klaytn address. You should have the private key for that address in your node or keystore. Default is undefined.

Example

> caver.klay.defaultAccount;
undefined

// set the default account
> caver.klay.defaultAccount = '0x11f4d0A3c12e86B4b5F39B213F7E19D048276DAe';

accountCreated

caver.klay.accountCreated(address [, defaultBlock] [, callback])

Returns true if the account associated with the address is created. It returns false otherwise.

NOTE accountCreated checks if the account exists on the network, so even if a key pair is created, false is returned if the account matching the address does not exist on the actual blockchain network.

Parameters

Name
Type
Description

address

String

The address of the account you want to query to see if it has been created on the network.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Boolean - The existence of an input address.

Example

> caver.klay.accountCreated('0x7e6ea9e6f24567cd9edb92e6e2d9b94bdae8a47f').then(console.log);
true

> caver.klay.accountCreated('0x6a616d696e652e6b6c6179746t00000000000000').then(console.log);
false

getAccount

caver.klay.getAccount(address[, defaultBlock] [, callback])

NOTE getAccount returns the account that exists on the network, so even if a key pair is created, null is returned if the account matching the address does not exist on the actual blockchain network.

Parameters

Name
Type
Description

address

String

The address of the account for which you want to get account information.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns a JSON object - A JSON object that contains the account information.

Example

> caver.klay.getAccount('0x52791fcf7900a64a6bcab8b89a78ae4cc60da01c').then(console.log);
{ 
  accType: 1,
  account:
  { 
     nonce: 3,
     balance: '0x446c3b15f9926687c8e202d20c14b7ffe02e7e3000',
     humanReadable: false,
     key: { keyType: 1, key: {} } 
  } 
}

> caver.klay.getAccount('0x52791fcf7900a64a6bcab8b89a78ae4cc60da01c', 'latest').then(console.log);
{ 
  accType: 1,
  account:
  { 
     nonce: 3,
     balance: '0x446c3b15f9926687c8e202d20c14b7ffe02e7e3000',
     humanReadable: false,
     key: { keyType: 1, key: {} } 
  } 
}

getAccounts

caver.klay.getAccounts([callback])

Returns a list of accounts that the node controls.

Parameters

Name
Type
Description

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Array - An array of addresses controlled by node.

Example

> caver.klay.getAccounts().then(console.log);
["0x11f4d0A3c12e86B4b5F39B213F7E19D048276DAe", "0xDCc6960376d6C6dEa93647383FfB245CfCed97Cf"]

getAccountKey

caver.klay.getAccountKey(address [, defaultBlock] [, callback])

NOTE getAccountKey returns the account key if the account exists on the network, so even if a key pair is created, null is returned if the account matching the address does not exist on the actual blockchain network.

Parameters

Name
Type
Description

address

String

The address of the account for which you want to get accountKey.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Object - The account key consist of public key(s) and a key type.

Example

// AccountKey type: AccountKeyLegacy
> caver.klay.getAccountKey('0x7e6ea9e6f24567cd9edb92e6e2d9b94bdae8a47f').then(console.log);
{ keyType: 1, key: {} }

// AccountKey type: AccountKeyPublic
> caver.klay.getAccountKey('0xe1be6edd35b68cbf69fe9376ed7320476cf18b5c').then(console.log);
{
  keyType: 2,
  key:{
    x:'0xb9a4b266083c05deb3ce95055510c34c84b8bb2ad1e0a687fafaf15118511e59',
    y:'0x7a28526d3d076d019f8856a56f1fefff33c6100e9f3a190e85d9c754aae7513d'
  }
}

// AccountKey type: AccountKeyFail
> caver.klay.getAccountKey('0xf6d69a7a006d7ab2dcef79195698f6c30895e7d5').then(console.log);
{
  keyType: 3,
  key:{}
}

// AccountKey type: AccountKeyWeightedMultiSig
> caver.klay.getAccountKey('0x676b02b1cb59bd86577f15ff17fb0d59d8ca1ab6').then(console.log);
{
  keyType: 4,
  key: {
    threshold: 2,
    keys: [
      {
        weight: 1,
        key: {
          x: '0xae6b72d7ce2c11520ac00cbd1c4da216171a96eae1ae3a0a1f979a554c9063ae',
          y: '0x79ddf38c8717030512f3ca6f304408a3beb51519b918b8d62a55ff4a8c165fea'
        }
      },
      {
        weight: 1,
        key: {
          x: '0xd4256fc43f42b3313b7204e42a82893a8d9b562f6c9b39456ee989339949c67c',
          y: '0xfc5e78e71b26f5a93b5bec454e4d63947576ffd23b4df624579ff4eb67a2a29b'
        }
      },
      {
        weight: 1,
        key: {
          x: '0xd653eae5f0e9cd6bfe4c3929f4c4f28c94f3bd183eafafee2d73db38a020d9d8',
          y: '0xe974e859b5be80755dedaebe937ac49800cbac483ca304179050a177e9ca0270'
        }
      }
    ]
  }
}

// AccountKey type: AccountKeyRoleBased
> caver.klay.getAccountKey('0x73436db2404853b41e4398d3cf094f1cce57f3bd').then(console.log);
{
  keyType: 5,
  key: [
      {
        key: {
          x: '0x819659d4f08e08d4bd97c6ce5ed2c2eb914201a5b3731eb9d208128df24b97dd',
          y: '0x1824267ab9e55f5a3fb1030f0299fa73fc0037305d5b1d90100e2131af41c010'
        },
        keyType: 2
      },
      {
        key: {
          x: '0x73363604ca8776a2883b02046361b7eb6bd11f4fc10700ee51c525bcded134c1',
          y: '0xfc3e3cb3f4f5b709df5a2075107bc73c8618440c08456bafc44ee6f27f9e6326'
        },
        keyType: 2
      },
      {
        key: {
          x: '0x95c920eb2571dff37baecdbbee32897e6e448c6725c5ab73569cc6f659684307',
          y: '0xef7839023c48acf710ad322356c12b7c5b7f475515ba7d5834f41a993f42b8f9'
        },
        keyType: 2
      }
  ]
}

getBalance

caver.klay.getBalance(address [, defaultBlock] [, callback])

Gets the balance of an address at a given block.

Parameters

Name
Type
Description

address

String

The address to get the balance of.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns String - The current balance for the given address in peb.

Example

> caver.klay.getBalance("0x407d73d8a49eeb85d32cf465507dd71d507100c1").then(console.log);
"1000000000000"

getCode

caver.klay.getCode(address [, defaultBlock] [, callback])

Gets the code at a specific address.

Parameters

Name
Type
Description

address

String

The address to get the code from.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns String - The data at given address address.

Example

> caver.klay.getCode("0xd5677cf67b5aa051bb40496e68ad359eb97cfbf8").then(console.log);
"0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"

getTransactionCount

caver.klay.getTransactionCount(address [, blockNumber] [, callback])

Gets the number of transactions sent from this address.

Parameters

Name
Type
Description

address

String

The address to get the number of transactions from.

blockNumber

number | string

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Type
Description

Number

The number of transactions sent from the given address.

Example

> caver.klay.getTransactionCount("0x11f4d0A3c12e86B4b5F39B213F7E19D048276DAe")
  .then(console.log);
1

isContractAccount

caver.klay.isContractAccount(address [, defaultBlock] [, callback])

Returns true if an input account has a non-empty codeHash at the time of a specific block number. It returns false if the account is an EOA or a smart contract account which doesn't have codeHash.

Parameters

Name
Type
Description

address

String

The address of the account you want to check for isContractAccount.

defaultBlock

Number | String

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns Boolean - true means the input parameter is an existing smart contract address.

Example

> caver.klay.isContractAccount('0x7e6ea9e6f24567cd9edb92e6e2d9b94bdae8a47f').then(console.log);
true

> caver.klay.isContractAccount('0x407d73d8a49eeb85d32cf465507dd71d507100c1').then(console.log);
false

sign

caver.klay.sign(message, address [, callback])

Parameters

Name
Type
Description

message

String

Message to sign.

address

String

The address of the account to sign the message with.

callback

Function

(optional) Optional callback, returns an error object as the first parameter and the result as the second.

Return Value

Promise returns String - The message signature signed with the account's private key.

Example

> caver.klay.sign('Message to sign', '0x1427ac5d0f1c3174ee6ea05d29a9b05fd31d7579').then(console.log)
0xde8bd2f5a45de6b1baea57ed0219735ab60f0ef55c5e31a4b774824abea31bfc34c8bdbca43ed4155e8e6a8e0d11d7aba191ba025e0487ada2bcc422252b81591b

(optional) If you pass this parameter, it will not use the default block set with .

Returns the account information of a given address. There are two different account types in Klaytn: Externally Owned Account (EOA) and Smart Contract Account. See .

(optional) If you pass this parameter, it will not use the default block set with .

Returns the account key of the Externally Owned Account (EOA) of the given address. If the account has AccountKeyLegacy or the account of the given address is a Smart Contract Account, it will return an empty key value. See .

(optional) If you pass this parameter, it will not use the default block set with .

(optional) If you pass this parameter, it will not use the default block set with .

(optional) If you pass this parameter, it will not use the default block set with .

(optional) A block number, the string pending for the pending nonce, or the string earliest or latest as in the . If omitted, latest will be used.

(optional) If you pass this parameter, it will not use the default block set with .

Generates signed data specific to the Klaytn network. Refer to to know how the signature is generated.

NOTE: This API provides the function to sign a message using an account that exists in your node. The account in the node must be unlocked to sign the message. To sign a transaction, use .

Klaytn Accounts
Account Key
Klaytn Platform API - klay_sign
caver.klay.signTransaction
caver.klay.call()
caver.klay.sendTransaction()
new caver.klay.Contract()
myContract.methods.myMethod().call()
new caver.klay.Contract()
myContract.methods.myMethod().send()
caver.klay.defaultBlock
caver.klay.defaultBlock
caver.klay.defaultBlock
caver.klay.defaultBlock
caver.klay.defaultBlock
default block parameter
caver.klay.defaultBlock