caver-js ~v1.4.1

caver-js is a JavaScript API library that allows developers to interact with a Klaytn node using a HTTP or Websocket connection. It is available on npm.
Features
Complete implementation of Klaytn’s JSON-RPC client API over HTTP and Websocket
Support of Klaytn transaction, account, and account key types
JavaScript smart contract package to deploy and execute a smart contract on the Klaytn network
In-memory wallet for managing Klaytn accounts
Support of fee-delegation
Support of the Klaytn wallet key format
Encoding/decoding of a transaction object in RLP
Signing of a transaction object
Easy to port web3-js application to caver-js
Packages in caver-js
Below are packages provided in caver-js.
​caver.klay​
​caver.klay.accounts​
​caver.klay.Contract​
​caver.klay.net​
​caver.klay.abi​
​caver.utils​
Error Code Improvement
The error messages from Ethereum via web3.js are hardly figuring out where the error occurs. caver-js improves the interface to catch error messages from Klaytn.
More details can be found in the value of txError of the transaction receipt like the below:
Error: runtime error occurred in interpreter
 {
  "blockHash": "0xe7ec35c9fff1178d52cee1d46d40627d19f828c4b06ad1a5c3807698b99acb20",
  "blockNumber": 7811,
  "contractAddress": null,
  "from": "0xa8a2d37727197cc0eb827f8c5a3a3aceb26cf59e",
  "gasUsed": 9900000000,
  "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "status": false,
  "to": "0xf8425b0f65147969621f9390ca06139c7b439497",
  "transactionHash": "0x85ce2b307899c90144442d9b3236827ac57375c522be2435093aebfd920b8c58",
  "transactionIndex": 0,
  "txError": "0x2",
  "events": {}
}
Caution when Sending a Transaction to Klaytn
Klaytn은 고정된 가스 가격 (25 ston = 25 * 10^9)을 사용합니다. Klaytn 네트워크에 제출된 다른 가스 가격의 트랜잭션은 거절됩니다. 가스 가격에 대한 자세한 내용은 Gas and Unit Price Overview를 참조하세요. 네트워크에서 사용되는 가스 가격은 caver.klay.getGasPrice를 사용하여 얻을 수 있습니다.
만일 트랜잭션을 서명할 때나 제출할 때 gasPrice가 정의되지 않았을 경우, caver-js는 트랜잭션 가스 가격을 설정하기 위해 caver.klay.getGasPrice RPC 호출을 사용합니다.
Links
caver-js GitHub repository​
caver-js on npm​
caver.ipfs
Getting Started (~v1.4.1)
Last modified 5mo ago