OpenViSTAI · Agents · Blockchain · Crypto
Submit a project
Menu
Developer Tools

Cljs WEB3

Cljs WEB3 is an EPL-1.0-licensed ClojureScript library that wraps Ethereum Web3 API methods as Clojure-style functions. It supports injected and HTTP providers, contract deployment and interaction, and callback- or core.async-based asynchronous calls.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Cljs WEB3 — 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 an Ethereum application written in ClojureScript needs Web3 API access, smart-contract operations or asynchronous client calls.

Who it is for

  • ClojureScript developers building Ethereum decentralized applications.
  • Developers who need to connect ClojureScript interfaces to injected wallets or HTTP Web3 providers.
  • Teams writing asynchronous Ethereum client workflows with core.async.

Documented uses

  • Call Ethereum Web3 methods from ClojureScript using kebab-cased function names.
  • Create a provider-backed Web3 instance from an injected provider or HTTP URL.
  • Create contract instances, call contract methods, retrieve call data and deploy contracts.
  • Handle asynchronous Web3 responses with callbacks or core.async channels.
  • Control a testrpc server using the library's EVM namespace.
Before you choose

Requirements & limits

The repository specifies the EPL-1.0 license. The README lists the dependency version 0.19.0-0-11.

  • The library adapts Web3 methods to kebab-cased ClojureScript functions and keywordized callback results.
  • Provider setup can use an injected Web3 provider or an HTTP provider URL.
  • The README documents both callback and cljs.core.async interfaces.
  • The README says cljsjs.web3 is needed when not using the MetaMask extension or Mist browser.

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

Add cljs-web3 to a ClojureScript namespace

Set up a namespace to use cljs-web3’s Ethereum Web3 API wrappers.

Before you start

  • A ClojureScript project with a dependency configuration.
  • For a provider other than the MetaMask extension or Mist browser, include cljsjs.web3.

Steps

  1. Add [cljs-web3 "0.19.0-0-11"] to the project dependencies.

  2. In the application namespace, require the cljs-web3 namespaces needed for the Web3 areas the application will use, such as cljs-web3.core and cljs-web3.eth.

  3. When not using MetaMask or Mist, also require cljsjs.web3.

Expected outcome

The namespace is configured to reference cljs-web3 functions for Ethereum Web3 API methods.

Guide limitations

  • This covers dependency and namespace setup only; it does not describe configuring a project build or verifying the setup.
  • The README marks cljsjs.web3 as needed only when not using MetaMask or Mist.
Documentation 1 ↗
Source-based practical guide

Create a Web3 instance and call a contract method

Use cljs-web3 to create a provider-backed Web3 instance and call a method on an already deployed contract.

Before you start

  • cljs-web3 is added to the project and its core and eth namespaces are required.
  • An injected Web3 provider from Mist or MetaMask, or an HTTP provider URL.
  • The contract ABI, deployed contract address, and method arguments.

Steps

  1. Create a Web3 instance using (web3/web3) for injected Web3, or (web3/create-web3 "http://localhost:8545/") for the documented HTTP-provider example.

  2. Create an instance of the deployed contract with (web3-eth/contract-at web3 abi address).

  3. Call a contract method with (web3-eth/contract-call ContractInstance :multiply 5), replacing the example method and argument with the desired ones.

Expected outcome

A contract method call is issued through the cljs-web3 wrapper using the created contract instance.

Guide limitations

  • The example uses a placeholder localhost HTTP URL; it does not provide provider setup or connection verification.
  • The method name and argument shown are illustrative; ABI, address, and valid method arguments must be supplied by the application.
  • The README does not specify the returned result or error handling for this call.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
16 October 2026
Original website title
district0x/cljs-web3 · Official homepage title · retained in its source language
How we review sourcesSuggest a correction