Sometimes it's nice to work with your contracts interactively for testing and debugging purposes, or for executing transactions by hand. Truffle provides you two easy ways to do this via an interactive console, with your contracts available and ready to use.
- Truffle console: A basic interactive console connecting to any Ethereum client
- Truffle Develop: An interactive console that also spawns a development blockchain
Having two different consoles allows you to choose the best tool for your needs.
Reasons to use Truffle console:
- You have a client you're already using, such as Ganache or geth
- You want to migrate to a testnet (or the main Ethereum network)
- You want to use a specific mnemonic or account list
Reasons to use Truffle Develop:
- You are testing your project with no intention of immediately deploying
- You don't need to work with specific accounts (and you're fine with using default development accounts)
- You don't want to install and manage a separate blockchain client
All commands require that you be in your project folder. You do not need to be at the root.
To launch the console:
This will look for a network definition called
development in the configuration, and connect to it, if available. You can override this using the
--network <name> option. See more details in the Networks section as well as the command reference.
When you load the console, you'll immediately see the following prompt:
This tells you you're running within a Truffle console using the
To launch Truffle Develop:
This will spawn a development blockchain locally on port
9545, regardless of what your
truffle.js configuration file calls for.
When you load Truffle Develop, you will see the following:
Truffle Develop started at http://localhost:9545/ Accounts: (0) 0x627306090abab3a6e1400e9345bc60c78a8bef57 (1) 0xf17f52151ebef6c7334fad080c5704d77216b732 (2) 0xc5fdf4076b8f3a5357c5e395ab970b5b54098fef (3) 0x821aea9a577a9b44299b9c15c88cf3087f3b5544 (4) 0x0d1d4e623d10f9fba5db95830f7d3839406c6af2 (5) 0x2932b7a2355d6fecc4b5c0b6bd44cc31df247a2e (6) 0x2191ef87e392377ec08e7c08eb105ef5448eced5 (7) 0x0f4f2ac550a1b4e2280d04c21cea7ebd822934b5 (8) 0x6330a553fc93768f612722bb8c2ec78ac90b3bbc (9) 0x5aeda56215b167893e80b4fe645ba6d5bab767de Private Keys: (0) c87509a1c067bbde78beb793e6fa76530b6382a4c0241e5e4a9ec0a0f44dc0d3 (1) ae6ae8e5ccbfb04590405997ee2d52d2b330726137b875053c36d94e974d162f (2) 0dbbe8e4ae425a6d2687f1a7e3ba17bc98c673636790f1b8ad91193c05875ef1 (3) c88b703fb08cbea894b6aeff5a544fb92e78a18e19814cd85da83b71f772aa6c (4) 388c684f0ba1ef5017716adb5d21a053ea8e90277d0868337519f97bede61418 (5) 659cbb0e2411a44db63778987b1e22153c086a95eb6b18bdf89de078917abc63 (6) 82d052c865f5763aad42add438569276c00d3d88a2d062d36b2bae914d58b8c8 (7) aa3680d5d48a8283413f7a108367c7299ca73f553735860a87b08f39395618b7 (8) 0f62d96d6675f32685bbdb8ac13cda7c23436f63efbb9d07700d8669ff12b7c4 (9) 8d5366123cb560bb606379f90a0bfd4769eecc0557f1b362dcae9012b548b1e5 Mnemonic: candy maple cake sugar pudding cream honey rich smooth crumble sweet treat
This shows you the addresses, private keys, and mnemonic for this particular blockchain.
Note: The mnemonic and addresses cannot be changed. If you want to use a different mnemonic or set of addresses, we recommend using Ganache.
Warning: Remember to never use any of these addresses or the mnemonic on the mainnet. This is for development only.
Both Truffle Develop and the console provide most of the features available in the Truffle command line tool. For instance, you can type
migrate --reset within the console, and it will be interpreted the same as if you ran
truffle migrate --reset on the command line.
Additionally, both Truffle Develop and the console additionally have the following features:
- All of your compiled contracts are available and ready for use.
- After each command (such as
migrate --reset) your contracts are reprovisioned so you can start using the newly assigned addresses and binaries immediately.
web3library is made available and is set to connect to your Ethereum client.
All commands that return a promise will automatically be resolved, and the result printed, removing the need to use
.then()for simple commands. For example, the following command:
Will return something like:
If a Truffle command is not available, it is because it is not relevant for an existing project (for example,
init) or wouldn't make sense (for example,
See full command reference for more information.