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I am using truffle console to deploy contracts and using Nodejs/web3js to interact with it. I wanted to use ethereumjs-tx for signing transactions, here is the reference link. I am not sure how can I find the chain id and network id of the local blockchain for which I need to create rawtransaction. i.e 

const customCommon = Common.forCustomChain(
  'randomchainNmae',
  {
    name: 'my-network',
    networkId: ???,
    chainId: ???,
  },
  'petersburg',
)
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4
  • networkId and chainId are the same thing AFAIK. And it's not on Truffle side, but on Ganache side (or whatever you're using as a blockchain provider). On Truffle side you can filter specific network IDs via the Truffle configuration file (truffle.js or truffle-config.js). But the configuration of the actual ID is on the provider side. For example, if you ARE using Ganache, then you can use -i or --networkId in order to specify the network id that ganache-cli will use to identify itself (see here).
    – goodvibration
    Oct 10, 2019 at 8:14
  • 1
    You can probably also obtain it programmatically from the web3 instance which you're initializing in your script.
    – goodvibration
    Oct 10, 2019 at 8:15
  • 2
    With web3 v1.0 the following works web3.eth.net.getId().
    – Ismael ♦
    Oct 10, 2019 at 16:28
  • 4
    no, networkId and chainId are NOT the same, and the purpose of chainId is to resist transaction replay attacks. So this distinction is actually super-important but little-understood. e.g. see medium.com/@pedrouid/…
    – Chan-Ho Suh
    Dec 18, 2019 at 2:52

3 Answers 3

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14

You can get both using the web3 instance of web3.js:

const networkId = await web3.eth.net.getId();
const chainId = await web3.eth.getChainId();
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1
  • 1
    You can just write these down to your truffle cli like "await web3.eth.getChainId()" and you will get your chain ID.
    – myuce
    May 10, 2021 at 23:21
4

To answer the title directly, the chain_id of ganache is 0x539 (or 1337).

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1

If you don't know network_id then you can use the following network. Check your truffle.js

   development: {
          host: '127.0.0.1',
          port: 8545,
          network_id: "*",
          from: "", // default address to use for any transaction Truffle makes 
        }
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