Neonjs Cheatsheet

Helpful cheatsheet to give you complete overview of the neon-js methods you need to know when building dapp on Neo!

Wallet or Account

Neon.create.account() can take different type of value such as WIF, private key, public key, script hash and when you leave it blank it will create a new keypair.

Create a new keypair

const account = Neon.create.account()console.log(a.address)console.log(a.WIF)console.log(a.privateKey)console.log(a.publicKey)

Account with WIF

const WIF = "L4VqMgXehi1k97C3dH3xR5XWMWt1BxfYNj87QrYxVVBhjo7woAKa"const account = Neon.create.account(WIF)console.log(a.address)console.log(a.WIF)console.log(a.privateKey)console.log(a.publicKey)

Get address from a public key

const publicKey = "031b88e4809d7c384b7f3fb4d04559870cbc3cddf3c50a38bae9fedb90256127b6"const account = Neon.create.account(publicKey)console.log(a.address)

Get address from a script hash

const scriptHash = "ec35d21b1b121dd5653454f8c615709ec7ba36a7"const account = Neon.create.account(scriptHash)console.log(a.address)

Smart contract

Invoke a method in a smart contract

const contractHash = "0xd2a4cff31913016155e38e474a2c06d08be276cf" //GAS Contractconst networkMagic = Neon.CONST.MAGIC_NUMBER.MainNetconst rpcAddress = "https://n3seed1.ngd.network:10332/"const WIF = "L4VqMgXehi1k97C3dH3xR5XWMWt1BxfYNj87QrYxVVBhjo7woAKa"const account = Neon.create.account(WIF)const contract = new Neon.experimental.SmartContract(Neon.u.HexString.fromHex(contractHash),    {        networkMagic,        rpcAddress,        account    })
const amount = 1 * Math.pow(10,8)const operation = "transfer"const params = [    sc.ContractParam.hash160(account.address),    sc.ContractParam.hash160("NbA7bUJM6bFTvVEcYZhkwaSMKnVho4faRW"),    sc.ContractParam.integer(amount),    sc.ContractParam.any("")]
let result;try {    const txHash = await contract.invoke(operation, params);    console.log(txHash)} catch (e) {    console.log(e);}

Validating

neon-js provides convenient methods in Neon.is package. Some of the example below.

const address = Neon.is.address("NbA7bUJM6bFTvVEcYZhkwaSMKnVho4faRW")console.log(address) //true

Converter

neon-js provides several method to convert value from one to another. You will be using some of these methods very often. Most of the time When something is wrong, it's likely related to the data type.

let b64 = Neon.u.hex2base64(Neon.u.str2hexstring("apisit.neo"))console.log(b64)

let reversedHex = Neon.u.reverseHex("3ff68d232a60f23a5805b8c40f7e61747f6f61ce")console.log(reversedHex)