Welcome to Juno

Juno is a Go implementation of a Starknet full-node client created by Nethermind to allow node operators to easily and reliably support the network and advance its decentralisation goals. Juno supports various node setups, from casual to production-grade indexers.

• Small database: pruning runs mainnet in roughly a fifth of full-history disk
• Ultra-fast synchronisation: Limited only by your hardware and the sequencer.
• Snapshot sync: start from a recent block instead of replaying from genesis
• Three RPC versions: v0_8, v0_9 and v0_10 served at the same time
• WebSocket subscriptions: new blocks and events pushed as they happen
• Minimal RPC latency: tune VM concurrency and cache size for read-heavy nodes
• Prometheus metrics: sync, database and RPC counters on a scrape endpoint

Getting started

These pages follow the order you will need them, from sizing a machine to serving your first request.

Hardware Requirements

Size a machine for a validator, a dApp backend, or an RPC provider

Running a Juno Node

Start a node with Docker, a prebuilt binary, or from source

Syncing from a Snapshot

Start from a recent block instead of replaying the chain from genesis

Configuring Juno

Set options with flags, environment variables, or a YAML file

Interacting with Juno

Call the node over JSON-RPC and subscribe to updates over WebSocket

Community and support

The FAQ covers the errors most operators meet first. For anything else:

• Telegram: Ask questions and follow announcements.
• Discord: Reach the Juno team and other operators.
• X (Twitter): Follow for the latest news and insights from Nethermind.

Contributions and partnerships

We value community contributions and are eager to support your involvement. Here's how you can contribute:

• Run a Juno node to strengthen the Starknet network, or stake and validate.
• Give Juno a star on GitHub.
• Share your thoughts on X (Twitter).
• Report bugs or suggest new features.

Whether it's a partnership, an idea, or a question that doesn't fit anywhere above, we'd love to hear from you at [email protected].