Get the EthersJs library in nodejs

Moralis General
#1

Hello.

Please provide me with correct code for EthersJs library.

Am I right with this example:

await Moralis.start({moralisSecret});
const ethers = Moralis.web3Library;
const daiAddress = "dai.tokens.ethers.eth";
const daiAbi = [
    "function name() view returns (string)",
    "function symbol() view returns (string)",
    "function balanceOf(address) view returns (uint)",
    "function transfer(address to, uint amount)",
    "event Transfer(address indexed from, address indexed to, uint amount)",
];
const daiContract = new ethers.Contract(daiAddress, daiAbi);

or I need use:

const daiContract = new ethers.Contract(daiAddress, daiAbi, provider);

What is provider in this case?

Or provider in this case (not common):

const provider = await Moralis.enableWeb3();

and correct code is:

await Moralis.start({moralisSecret});
const provider = await Moralis.enableWeb3();
const ethers = Moralis.web3Library;
const daiAddress = "dai.tokens.ethers.eth";
const daiAbi = [
    "function name() view returns (string)",
    "function symbol() view returns (string)",
    "function balanceOf(address) view returns (uint)",
    "function transfer(address to, uint amount)",
    "event Transfer(address indexed from, address indexed to, uint amount)",
];
const daiContract = new ethers.Contract(daiAddress, daiAbi, provider);

Thanks.

#2

I know how to do it in cloud code, in case that it helps:

https://docs.moralis.io/moralis-dapp/cloud-code/cloud-functions#example-of-how-to-use-a-custom-rpc-url

#3

Thanks. But I don’t understand anything … Why did u give a response that doesn’t apply to my question? I didn’t ask about RPC, I asked about a specific example, which is specified in your documentation: https://docs.moralis.io/muralis-dapp/web3/web3#get-the-ethersjs-library. I decided to clarify the inaccuracies that there is in it.

Thanks.

#4

you want that server side, in node js?

can you use directly ethers in nodejs?

you can look at this example on how to use enableWeb3 in nodejs:

#5

Yes. I want to use example and modify it.

No. In this case I need provider.

Thanks. But this example not helps me and not answered for my question (((

#6

can you rephrase the question (probably I didn’t understand it)?

what you mean by the fact that you need provider?
being in nodejs you can use ethers or web3 directly with a speedy node RCP url

#7

I need EthersJs from Moralis. Ie for:

new ethers.Contract

I mean that in example https://docs.moralis.io/muralis-dapp/web3/web3#get-the-ethersjs-library I saw this:

const daiContract = new ethers.Contract(daiAddress, daiAbi, provider);

and my question is:

What is provider in this case?

Then I ask about code which I took from example and change it … That’s all.

#8

there is a difference on how to use it on nodejs compared to how to use it in a browser.

you may need to read more about how providers work in ethers:
https://docs.ethers.io/v5/api/providers/
https://docs.ethers.io/v5/api/providers/jsonrpc-provider/

#9

I know about it. That’s why I am asked about it.

In diff way I use code like this:

const web3Provider = new Web3.providers.WebsocketProvider(sProviderUrl, arProviderOptions);
const web3 = new Web3(web3Provider);
const oContract = new web3.eth.Contract(sDefaultContractAbi, sTokenContractAddress);

Everything is clear here)

And then I open this link https://docs.moralis.io/moralis-dapp/web3/web3#web3.js and see:

import Web3 from "web3"; // Only when using npm/yarn
// Enable web3 and get the initialized web3 instance from Web3.js
await Moralis.enableWeb3();
const web3Js = new Web3(Moralis.provider);

and below (https://docs.moralis.io/muralis-dapp/web3/web3#get-the-ethersjs-library) I see:

await Moralis.start({moralisSecret});
const ethers = Moralis.web3Library;
const daiAddress = "dai.tokens.ethers.eth";
const daiAbi = [
    "function name() view returns (string)",
    "function symbol() view returns (string)",
    "function balanceOf(address) view returns (uint)",
    "function transfer(address to, uint amount)",
    "event Transfer(address indexed from, address indexed to, uint amount)",
];
const daiContract = new ethers.Contract(daiAddress, daiAbi, provider);

So I am asked:

What is provider in this case?

Is it:

Moralis.provider

from above (https://docs.moralis.io/moralis-dapp/web3/web3#web3.js) or some else?

Or can I use:

const daiContract = new ethers.Contract(daiAddress, daiAbi);

instead of:

const daiContract = new ethers.Contract(daiAddress, daiAbi, provider);

Is this clear for now?

Thanks.

#10

I don’t know the exact answers now

this may be something from the source code that could help you:
https://github.com/MoralisWeb3/Moralis-JS-SDK/blob/9455b3e72cf66bb9c12b719dfa59f8bd94207087/src/InternalWeb3Provider.js

If you use moralisSecret in nodejs for Moralis.start then it will use your speedy node url

for the question with provider in

it seems to be a generic provider variable that you can replace with something that you have as provider

#11

The point is that I didn’t want to change anything ) I want to use only Moralis service. That’s why I am asking which way will be correct with example from https://docs.moralis.io/muralis-dapp/web3/web3#get-the-ethersjs-library.

Thanks.

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#12

this seems to work:

x = async () => {
    const  Moralis = require('moralis/node')
    console.log(Moralis.CoreManager.get("VERSION"))
    await Moralis.start({ moralisSecret: "asfasdf" });

    await Moralis.enableWeb3({
        chainId: 0x1,
        //privateKey:
        //   "private_key",
    });

    const ethers = Moralis.web3Library;

    const daiAddress = "dai.tokens.ethers.eth";
    const daiAbi = [
      "function name() view returns (string)",
      "function symbol() view returns (string)",
      "function balanceOf(address) view returns (uint)",
      "function transfer(address to, uint amount)",
      "event Transfer(address indexed from, address indexed to, uint amount)",
    ];

    customHttpProvider = new ethers.providers.JsonRpcProvider(Moralis.provider)

    customHttpProvider.getBlockNumber().then((result) => {
        console.log("Current block number: " + result);
    });

    const daiContract = new ethers.Contract(daiAddress, daiAbi, customHttpProvider);

    const name = await daiContract.name();
    console.log(name);
    // 'Dai Stablecoin'
}

x();
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