In blockchain development, JSON-RPC is a popular Remote Procedure Call (RPC) protocol used by blockchain node applications.

JSON-RPC was popularised by the original bitcoind node and then copied to Ethereum. JSON-RPC is human readable and simple protocol for programmatically asking information from your blockchain node.

This includes

  • Querying the current state information

  • Broadcasting transactions

JSON-RPC is used by

  • Wallets (query tokens, balances)

  • Decentralised application frontends

You can get a JSON-RPC API for your blockchain application by

  • Self-hosting a blockchain node and then turning on the JSON-RPC API port

  • Using a software-as-a-service provider - see ethereumnodes.com for details

Popular alternatives for JSON-RPC includes Protobuf, as used by Cosmos SDK.

See also

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