Juno is a golang Starknet node implementation by Nethermind with the aim of decentralising Starknet.

📌 Looking for a Starknet RPC Provider?

Access Nethermind's Starknet RPC service for free at https://data.voyager.online.

• Golang 1.20 or higher is required to build and run the project. You can find the installer on the official Golang download page.
• Rust.
• A C compiler: gcc or clang.

make juno
./build/juno

Use the --help flag for configuration information. Flags and their values can also be placed in a .yaml file that is passed in through --config.

To run Juno with Docker, use the following command. Make sure to create the $HOME/juno directory on your local machine before running the command.

docker run -d \
  --name juno \
  -p 6060:6060 \
  -v $HOME/juno:/var/lib/juno \
  nethermind/juno \
  --http \
  --http-port 6060 \
  --http-host 0.0.0.0 \
  --db-path /var/lib/juno \
  --eth-node <YOUR-ETH-NODE>

You should replace <YOUR-ETH-NODE> with your actual Ethereum node address. If you're using Infura, your Ethereum node address might look something like: wss:https://mainnet.infura.io/ws/v3/your-infura-project-id. Make sure you are using the websocket URL ws/wss and not the http URL http/https.

To view logs from the Docker container, use the following command:

docker logs -f juno

Use the provided snapshots to quickly sync your Juno node with the current state of the network.

1. Download Snapshot

   Fetch the snapshot from the provided URL:

   wget -O juno_mainnet.tar https://juno-snapshots.nethermind.dev/mainnet/juno_mainnet_v0.9.2_501593.tar

2. Prepare Directory

   Ensure you have a directory at $HOME/snapshots. If it doesn't exist yet, create it:

   mkdir -p $HOME/snapshots

3. Extract Tarball

   Extract the contents of the .tar file:

   tar -xvf juno_mainnet.tar -C $HOME/snapshots

4. Run Juno

   Execute the Docker command to run Juno, ensuring that you're using the correct snapshot path $HOME/snapshots/juno_mainnet:

   docker run -d \
     --name juno \
     -p 6060:6060 \
     -v $HOME/snapshots/juno_mainnet:/var/lib/juno \
     nethermind/juno \
     --http \
     --http-port 6060 \
     --http-host 0.0.0.0 \
     --db-path /var/lib/juno \
     --eth-node <YOUR-ETH-NODE>

After following these steps, Juno should be up and running on your machine, utilizing the provided snapshot.

• Starknet v0.13.0 support.

• JSON-RPC v0.6.0 (Available under /v0_6 endpoint)

  • starknet_chainId
  • starknet_blockNumber
  • starknet_blockHashAndNumber
  • starknet_getBlockWithTxHashes
  • starknet_getBlockWithTxs
  • starknet_getTransactionByHash
  • starknet_getTransactionReceipt
  • starknet_getBlockTransactionCount
  • starknet_getTransactionByBlockIdAndIndex
  • starknet_getStateUpdate
  • starknet_getNonce
  • starknet_getStorageAt
  • starknet_getTransactionStatus
  • starknet_getClassHashAt
  • starknet_getClass
  • starknet_getClassAt
  • starknet_syncing
  • starknet_getEvents
  • starknet_call
  • starknet_estimateFee
  • starknet_addInvokeTransaction
  • starknet_addDeclareTransaction
  • starknet_addDeployAccountTransaction
  • starkent_estimateMessageFee
  • starknet_traceTransaction
  • starknet_traceBlockTransactions
  • starknet_simulateTransactions
  • starknet_specVersion

• Juno's JSON-RPC:

  • juno_version

• JSON-RPC v0.5.1 (Available under /v0_5 endpoint)

• Integration of CairoVM.

• Verification of State from L1.

• Handle L1 and L2 Reorgs.

• Starknet state construction and storage using a path-based Merkle Patricia trie.

• Feeder gateway synchronisation of Blocks, Transactions, Receipts, State Updates and Classes.

• Block and Transaction hash verification.

We welcome PRs from external contributors and would love to help you get up to speed. Let us know you're interested in the Discord server and we can discuss good first issues. There are also many other ways to contribute. Here are some ideas:

• Run a node.
• Add a GitHub Star to the project.
• Tweet about Juno.
• Add a Github issue if you find a bug, or you need or want a new feature.

To establish a partnership with the Juno team, or if you have any suggestion or special request, feel free to reach us via email.

Copyright (c) 2022-present, with the following contributors.

Juno is open-source software licensed under the Apache-2.0 License.