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WEB3 Mock

WEB3 Mock is a JavaScript library that mocks Web3 responses by emulating wallets or blockchain RPC requests, allowing developers to test decentralized applications with controlled provider behaviour.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

WEB3 Mock — 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 dApp test needs controlled wallet or blockchain-provider responses rather than relying on live responses.

Who it is for

  • Developers writing tests for decentralized applications.
  • Teams using Jest, Cypress or Playwright to test wallet and provider interactions.

Documented uses

  • Mock wallet responses in a dApp test.
  • Set predictable results for blockchain RPC or contract requests.
  • Exercise application behaviour against mocked provider responses.
Before you choose

Requirements & limits

  • The README names Jest, Cypress and Playwright and says they should be set up before using the library.
  • Solana examples require explicit provider mocking; the basic EVM example initializes an Ethereum mock directly.
  • The repository specifies the MIT license.

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

Install WEB3 Mock as a development dependency

Add the library to a JavaScript project before configuring a test runner.

Before you start

  • A JavaScript project using Yarn or npm

Steps

  1. Install @depay/web3-mock with Yarn using yarn add @depay/web3-mock --dev, or with npm using the command below.

    Documented command
    npm install --save-dev @depay/web3-mock

  2. Set up Jest, Cypress or Playwright according to the project's guidance before using the library.

Expected outcome

The library is added as a development dependency, and the README identifies the test-runner setup as the next prerequisite.

Guide limitations

  • This covers dependency installation and the stated prerequisite only; it does not provide a complete test-runner setup recipe.
Documentation 1 ↗
Source-based practical guide

Initialize an Ethereum mock in a test

Set up the README's basic EVM mock example in a test suite.

Before you start

  • WEB3 Mock installed in the JavaScript project
  • Jest, Cypress or Playwright set up before using the library

Steps

  1. Import mock from @depay/web3-mock.

  2. In the test's beforeEach, call mock('ethereum').

  3. In the test, request eth_chainId and net_version from window.ethereum.

Expected outcome

The example shows the mocked requests returning chain ID `0x1` and network version `1`.

Guide limitations

  • The steps describe the README's basic Ethereum example, not a complete test configuration or a guarantee for other setups.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
15 October 2026
Original website title
DePayFi/web3-mock · Official homepage title · retained in its source language
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