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MerkleTree.js

MerkleTree.js is an open-source TypeScript/JavaScript library for constructing Merkle trees and generating and verifying Merkle proofs. It also includes implementations for several tree variants, including Merkle Mountain Range, Merkle Sum, Incremental Merkle, Merkle Radix and Unified Binary Tree.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

MerkleTree.js — 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 or TypeScript application needs to create Merkle trees or produce and verify Merkle proofs. For on-chain verification, consult the separately linked Solidity examples as a distinct integration step.

Who it is for

  • JavaScript or TypeScript developers implementing Merkle-root and proof workflows.
  • Blockchain application developers who need to generate proof data for a separate verification component.

Documented uses

  • Construct a Merkle tree from hashed data leaves and retrieve its root.
  • Generate a proof for a selected leaf and check it against a root.
  • Choose among listed Merkle tree variants for an application’s data structure.
Before you choose

Requirements & limits

The project identifies an MIT license and documents installation through npm. The README also lists a CDN distribution.

  • The README example supplies SHA-256 from crypto-js as the hash function; it does not describe this as a built-in dependency.
  • The project warns about second pre-image risks and forged roots with unbalanced trees, and advises using different hashing functions for leaves and nodes and not accepting unbalanced trees.
  • Solidity proof verification is shown through separate example repositories, not as an on-chain service within this library.

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 MerkleTree.js and prepare a JavaScript import

Add the library to a JavaScript project and import its MerkleTree class.

Before you start

  • A JavaScript project using npm.

Steps

  1. Install the package with the command below.

    Documented command
    npm install merkletreejs

  2. Import MerkleTree with an ES module import or a CommonJS require.

Expected outcome

The project has the package installed and the MerkleTree class available to import.

Guide limitations

  • These steps cover installation and import only, not constructing a tree or verifying a proof.
  • The README also documents path imports and a CDN option, but this guide follows the npm setup.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
13 October 2026
Original website title
merkletreejs/merkletreejs · Official homepage title · retained in its source language
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