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Version: 6.11.0

RpcProvider object 🔌 connect to the network

The first thing to do is to define with which network you want to interact.

Then you need to select a node. A node is a safe way to connect with the Starknet blockchain. You can use:

  • a node supplied by a node provider - it can be free or not; it can have limitations or not; it can have WebSocket support or not.

    RPC node providers are for example Infura, Alchemy, Blast, Nethermind, Lava, Chainstack...

  • your own node, located on your local computer or in your local network.

    you can spin up your own node with Pathfinder, Juno, Papyrus, Deoxys, ...

  • a local development node, that simulates a Starknet network. Useful for devs to perform quick tests without spending precious fee token.

    Main development devnets are Starknet-devnet-rs, Madara, ...

Each node is communicating with Starknet.js using a rpc specification. Most of the nodes are able to use 2 rpc spec versions.
For example, this node is compatible with v0.6.0 & v0.7.0, using the following entry points :

From rpc spec v0.5.0, you can request the rpc spec version that uses a node address :

const resp = await myProvider.getSpecVersion();
console.log('rpc version =', resp);
// result : rpc version = 0.7.0

On Starknet.js side, you have to select the proper version, to be in accordance with the node you want to use :

Rpc spec version of your nodeStarknet.js version to use
v0.4.0Starknet.js v5.21.1
v0.5.0Starknet.js v5.23.0
v0.5.1Starknet.js v5.29.0 & v6.1.0
v0.6.0Starknet.js v6.9.0
v0.7.0Starknet.js v6.9.0

[!NOTE] Each Starknet.js version 6.x.x is compatible with 3 rpc spec versions, and recognize automatically the spec version if not provided.

With the RpcProvider class, you define the Starknet Rpc node to use.

import { RpcProvider } from 'starknet';

Connect your DAPP to an RPC node provider​

Default Rpc node​

If you don't want to use a specific node, or to handle an API key, you can use by default (using Rpc spec 0.7.0):

const myProvider = new RpcProvider({ nodeUrl: constants.NetworkName.SN_SEPOLIA });
const myProvider = new RpcProvider({ nodeUrl: constants.NetworkName.SN_MAIN });
// or
const myProvider = new RpcProvider(); // Sepolia

when using this syntax, a random public node will be selected.

Using a specific nodeUrl is the better approach, as such a node will have fewer limitations, the last version of software and will be less crowded.

Some examples of RpcProvider instantiation to connect to RPC node providers:

Mainnet​

// Infura node rpc 0.5.1 for Mainnet:
const providerInfuraMainnet = new RpcProvider({
  nodeUrl: 'https://starknet-mainnet.infura.io/v3/' + infuraKey,
});
// Blast node rpc 0.7.0 for Mainnet (0.4, 0.5 & 0_6 also available):
const providerBlastMainnet = new RpcProvider({
  nodeUrl: 'https://starknet-mainnet.blastapi.io/' + blastKey + '/rpc/v0_7',
});
// Lava node rpc 0.6.0 for Mainnet:
const providerMainnetLava = new RpcProvider({
  nodeUrl: 'https://g.w.lavanet.xyz:443/gateway/strk/rpc-http/' + lavaMainnetKey,
});
// Alchemy node rpc 0.6.0 for Mainnet:
const providerAlchemyMainnet = new RpcProvider({
  nodeUrl: 'https://starknet-mainnet.g.alchemy.com/starknet/version/rpc/v0_6/' + alchemyKey,
});
// Public Nethermind node rpc 0.7.0 for Mainnet (0_6 also available):
const providerMainnetNethermindPublic = new RpcProvider({
  nodeUrl: 'https://free-rpc.nethermind.io/mainnet-juno/v0_7',
});
// Public Blast node rpc 0.7.0 for Mainnet (0.4, 0.5 & 0_6 also available) :
const providerBlastMainnet = new RpcProvider({
  nodeUrl: 'https://starknet-mainnet.public.blastapi.io/rpc/v0_7',
});
// Public Lava node rpc 0.6.0 for Mainnet:
const providerLavaMainnet = new RpcProvider({
  nodeUrl: 'https://json-rpc.starknet-mainnet.public.lavanet.xyz',
});

Take care to safely manage your API key. It's a confidential item!

Goerli Testnet​

[!IMPORTANT]

The Goerli testnet is no more in service.

Sepolia Testnet​

// Infura node rpc 0.5.1 for Sepolia Testnet :
const providerInfuraSepoliaTestnet = new RpcProvider({
  nodeUrl: 'https://starknet-sepolia.infura.io/v3/' + infuraKey,
});
// Public Nethermind node rpc 0.7.0 for Sepolia Testnet (0_6 also available) :
const providerSepoliaTestnetNethermindPublic = new RpcProvider({
  nodeUrl: 'https://free-rpc.nethermind.io/sepolia-juno/v0_7',
});
// Public Blast node rpc 0.7.0 for Sepolia Testnet (0_6 also available) :
const providerSepoliaTestnetBlastPublic = new RpcProvider({
  nodeUrl: 'https://starknet-sepolia.public.blastapi.io/rpc/v0_7',
});

Connect to your own node​

Pathfinder​

For a local Pathfinder node:

const provider = new RpcProvider({ nodeUrl: '127.0.0.1:9545/rpc/v0_7' });

Your node can be located in your local network (example: Pathfinder node running on a computer in your network, launched with this additional option: --http-rpc 0.0.0.0:9545). You can connect with:

const provider = new RpcProvider({ nodeUrl: '192.168.1.99:9545/rpc/v0_7' });

Juno​

For a local Juno node initialize the provider with:

const provider = new RpcProvider({ nodeUrl: 'http://127.0.0.1:6060/v0_7' });

If Juno is running on a separate computer in your local network, don't forget to add the option --http-host 0.0.0.0 when launching Juno.

Devnet​

Example of a connection to a local development node (rpc 0.7.0), with Starknet-devnet-rs v0.0.6:

const provider = new RpcProvider({ nodeUrl: 'http://127.0.0.1:5050/rpc' });

If you have customized host and port during starknet-devnet initialization, adapt in accordance your script.