Sending Tokens Using ethers.js

ETHERS.JSERC-20TOKENS

Beginner

Kim YongJun

2021 cuoŋománnu 6

2 minute read minute read

Send Token Using ethers.js(5.0)

In This Tutorial You'll Learn How To

Import ethers.js
Transfer token
Set gas price according to the network traffic situation

To-Get-Started

To get started, we must first import the ethers.js library into our javascript Include ethers.js(5.0)

Installing

1/home/ricmoo> npm install --save ethers

ES6 in the Browser

1<script type="module">
2  import { ethers } from "https://cdn.ethers.io/lib/ethers-5.0.esm.min.js"
3  // Your code here...
4</script>

ES3(UMD) in the Browser

1<script
2  src="https://cdn.ethers.io/lib/ethers-5.0.umd.min.js"
3  type="application/javascript"
4></script>

Parameters

contract_address: Token contract address (contract address is needed when the token you want to transfer is not ether)
send_token_amount: The amount you want to send to the receiver
to_address: The receiver's address
send_account: The sender's address
private_key: Private key of the sender to sign the transaction and actually transfer the tokens

Notice

signTransaction(tx) is removed because sendTransaction() does it internally.

Sending Procedures

1. Connect to network (testnet)

Set Provider (Infura)

Connect to Ropsten testnet

1window.ethersProvider = new ethers.providers.InfuraProvider("ropsten")

2. Create wallet

1let wallet = new ethers.Wallet(private_key)

3. Connect Wallet to net

1let walletSigner = wallet.connect(window.ethersProvider)

4. Get current gas price

1window.ethersProvider.getGasPrice() // gasPrice

5. Define Transaction

These variables defined below are dependent on send_token()

Transaction parameters

send_account: address of the token sender
to_address: address of the token receiver
send_token_amount: the amount of tokens to send
gas_limit: gas limit
gas_price: gas price

See below for how to use

1const tx = {
2  from: send_account,
3  to: to_address,
4  value: ethers.utils.parseEther(send_token_amount),
5  nonce: window.ethersProvider.getTransactionCount(send_account, "latest"),
6  gasLimit: ethers.utils.hexlify(gas_limit), // 100000
7  gasPrice: gas_price,
8}

6. Transfer

1walletSigner.sendTransaction(tx).then((transaction) => {
2  console.dir(transaction)
3  alert("Send finished!")
4})

How to use it

1let private_key =
2  "41559d28e936dc92104ff30691519693fc753ffbee6251a611b9aa1878f12a4d"
3let send_token_amount = "1"
4let to_address = "0x4c10D2734Fb76D3236E522509181CC3Ba8DE0e80"
5let send_address = "0xda27a282B5B6c5229699891CfA6b900A716539E6"
6let gas_limit = "0x100000"
7let wallet = new ethers.Wallet(private_key)
8let walletSigner = wallet.connect(window.ethersProvider)
9let contract_address = ""
10window.ethersProvider = new ethers.providers.InfuraProvider("ropsten")
11
12send_token(
13  contract_address,
14  send_token_amount,
15  to_address,
16  send_address,
17  private_key
18)
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Success!

send_token()

1function send_token(
2  contract_address,
3  send_token_amount,
4  to_address,
5  send_account,
6  private_key
7) {
8  let wallet = new ethers.Wallet(private_key)
9  let walletSigner = wallet.connect(window.ethersProvider)
10
11  window.ethersProvider.getGasPrice().then((currentGasPrice) => {
12    let gas_price = ethers.utils.hexlify(parseInt(currentGasPrice))
13    console.log(`gas_price: ${gas_price}`)
14
15    if (contract_address) {
16      // general token send
17      let contract = new ethers.Contract(
18        contract_address,
19        send_abi,
20        walletSigner
21      )
22
23      // How many tokens?
24      let numberOfTokens = ethers.utils.parseUnits(send_token_amount, 18)
25      console.log(`numberOfTokens: ${numberOfTokens}`)
26
27      // Send tokens
28      contract.transfer(to_address, numberOfTokens).then((transferResult) => {
29        console.dir(transferResult)
30        alert("sent token")
31      })
32    } // ether send
33    else {
34      const tx = {
35        from: send_account,
36        to: to_address,
37        value: ethers.utils.parseEther(send_token_amount),
38        nonce: window.ethersProvider.getTransactionCount(
39          send_account,
40          "latest"
41        ),
42        gasLimit: ethers.utils.hexlify(gas_limit), // 100000
43        gasPrice: gas_price,
44      }
45      console.dir(tx)
46      try {
47        walletSigner.sendTransaction(tx).then((transaction) => {
48          console.dir(transaction)
49          alert("Send finished!")
50        })
51      } catch (error) {
52        alert("failed to send!!")
53      }
54    }
55  })
56}
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