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How is the truffle port set when one runs truffle unbox react and then truffle develop ?

The documentation states that the default port is 9545 (https://trufflesuite.com/docs/truffle/getting-started/using-truffle-develop-and-the-console.html), but the port specified in the downloaded truffle-config.js is 8545, which is supposed to be the default port when Ganache is the client.

I also noticed that the default port specified here :

https://github.com/truffle-box/react-box/blob/master/client/src/getWeb3.js

is 8545:

https://github.com/truffle-box/react-box/blob/c33a70f57559c0040f7109f9db498a0f83187776/client/src/getWeb3.js#L26

 // Fallback to localhost; use dev console port by default...
      else {
         const provider = new Web3.providers.HttpProvider(
          "http://127.0.0.1:8545"
      );

Can someone help shed light on this ?

2 Answers 2

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truffle develop spins up a specially configured ganache to interact with the truffle console. This is on purpose run on a different port (9545) to not conflict with the default ganache port 8545, see https://github.com/trufflesuite/ganache-cli-archive).

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  • Thx, I didn't know it ran ganache internally. Do you know why when I run truffle develop it states : Truffle Develop started at http://127.0.0.1:8545/ instead of : Truffle Develop started at http://127.0.0.1:9545/ ?
    – femibyte
    Jan 17, 2022 at 18:17
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Ok, so the way I got it to start up on port 9545 was to modify the truffle-config.js. The default file generated when I ran truffle unbox react had these lines:

 networks: {
   develop: {
     port: 8545
  }
 }

Contrary to the documentation, it does seem like truffle develop results in this file being read.

I changed the network name to development:

 networks: {
   development: {
     port: 8545
  }
 }

And now when I run truffle develop it starts up on port 9545.

Truffle Develop started at http://127.0.0.1:9545/

It looks like the Truffle documentation may be a bit outdated.

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