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Ethjs Query

Ethjs Query is a JavaScript library that sends Ethereum RPC method calls through a configured provider. It supports queries such as retrieving an address balance and submitting a transaction, and formats RPC data through ethjs-format.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Ethjs Query — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when a JavaScript application needs an asynchronous interface to Ethereum RPC methods and you can configure access to an Ethereum node.

Who it is for

  • JavaScript developers integrating Ethereum RPC calls into an application.
  • Developers building features for balance lookup, transaction submission or other documented Ethereum RPC methods.

Documented uses

  • Retrieve an Ethereum address balance from a node.
  • Submit a transaction through a configured provider.
  • Query Ethereum node data such as blocks, transactions, accounts and gas estimates.
Before you choose

Requirements & limits

The repository identifies the project as open source under the MIT license and documents installation through npm.

  • The application must supply a provider connected to an Ethereum node; the library is not itself a node or hosted endpoint.
  • Calls are asynchronous and require callbacks or promises.
  • Numeric inputs accept BigNumber, BN, string, hexadecimal or JavaScript number forms; decimal and negative values cause errors, and returned numeric values are BN.js objects.
  • The README documents support for Ethereum RPC methods and names geth, Parity and TestRPC as example node implementations.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Connect a JavaScript application and request an Ethereum balance

Install Ethjs Query, configure the documented HTTP provider, and make an asynchronous balance query.

Before you start

  • A JavaScript project using npm
  • An Ethereum node reachable through an HTTP provider URL
  • The packages shown in the example: ethjs-query and ethjs-provider-http

Steps

  1. Install ethjs-query with npm install --save ethjs-query.

  2. Create an HTTP provider using the URL of the Ethereum node.

  3. Pass the provider to a new Eth instance from ethjs-query.

  4. Call getBalance with an Ethereum address and handle the result with a callback or promise.

Expected outcome

The application receives the requested balance as a BN.js object through the asynchronous call.

Guide limitations

  • The guide covers a balance query only; the library requires a reachable Ethereum RPC node.
  • All methods are asynchronous and require a callback or promise.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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Sources checked
15 October 2026
Original website title
ethjs/ethjs-query · Official homepage title · retained in its source language
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