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Common

Common is a collection of TypeScript utility packages used across projects in the polkadot-js family for Polkadot and Substrate development. It includes keyring management, general utilities, and cryptographic and hashing helpers, with additional safety checks intended to support consistent code and reduce boilerplate.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Common — 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 Common when a Polkadot or Substrate project needs the shared utility packages maintained for the polkadot-js family, or when contributing to those packages.

Who it is for

  • Developers building applications in the polkadot-js ecosystem.
  • Contributors working on shared Polkadot or Substrate utility libraries.

Documented uses

  • Manage keyrings through a shared library package.
  • Reuse general-purpose utility functions across applications.
  • Use cryptographic and hashing helpers in Polkadot.js projects.
Before you choose

Requirements & limits

The repository is public and specifies the Apache-2.0 license.

  • The repository is organized as internal packages for keyring management, general utilities, and crypto and hashing.
  • Development dependencies should be installed with Yarn; the README warns that npm can result in broken dependencies.
  • The README documents Node.js and Yarn prerequisites and a repository build command.

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

Set up the Common repository for development

Clone the repository, install its workspace dependencies, and build the project.

Before you start

  • Node.js; the README recommends Node 10 for development.
  • Yarn 1.10.1 or later.

Steps

  1. Clone the repository with the command below.

    Documented command
    git clone https://github.com/polkadot-js/common

  2. From the repository, install dependencies with yarn.

  3. Run yarn run build.

Expected outcome

The repository dependencies are installed and the README's build command has been run.

Guide limitations

  • The README warns that using npm instead of Yarn can result in broken dependencies.
  • The documented steps do not establish that the build succeeds in a particular environment.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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Sources checked
10 October 2026
Original website title
polkadot-js/common · Official homepage title · retained in its source language
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