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Tendermint2 JavaScript Client

@gnolang/tm2-js-client is a JavaScript/TypeScript client implementation for Tendermint2-based chains. It is designed to make it easy for developers to interact with TM2 chains, providing a simplified API for account and transaction management. By doing all the heavy lifting behind the scenes, @gnolang/tm2-js-client enables developers to focus on what really matters - building their dApps.

Key Features

  • JSON-RPC and WebSocket client support via a Provider
  • Simple account and transaction management API with a Wallet
  • Designed for easy extension for custom TM2 chains, such as Gnoland


To install @gnolang/tm2-js-client, use your preferred package manager:

yarn add @gnolang/tm2-js-client
npm install @gnolang/tm2-js-client

Common Terminology


A Provider is an interface that abstracts the interaction with the Tendermint2 chain, making it easier for users to communicate with it. Rather than requiring users to understand which endpoints are exposed, what their return types are, and how they are parsed, the Provider abstraction handles all of this behind the scenes. It exposes useful API methods that users can use and expects concrete types in return.

Currently, the @gnolang/tm2-js-client package provides support for two Provider implementations:

  • JSON-RPC Provider: executes each call as a separate HTTP RPC call.
  • WS Provider: executes each call through an active WebSocket connection, which requires closing when not needed anymore.


A Signer is an interface that abstracts the interaction with a single Secp256k1 key pair. It exposes methods for signing data, verifying signatures, and getting metadata associated with the key pair, such as the address.

Currently, the @gnolang/tm2-js-client package provides support for two Signer implementations:

  • Key: a signer that is based on a raw Secp256k1 key pair.
  • Ledger: a signer that is based on a Ledger device, with all interaction flowing through the user's device.


A Wallet is a user-facing API that is used to interact with an account. A Wallet instance is tied to a single key pair and essentially wraps the given Provider for that specific account.

A wallet can be generated from a randomly generated seed, a private key, or instantiated using a Ledger device.

Using the Wallet, users can easily interact with the Tendermint2 chain using their account without having to worry about account management.