Lit Protocol Javascript/Typescript SDK V6.2.x

The Lit JavaScript SDK provides developers with a framework for implementing Lit functionality into their own applications. Find installation instructions in the docs to get started with the Lit SDK based on your use case:


Quick Start

NodeJS Exclusive

Removed browser-specific methods, e.g., checkAndSignAuthSig

yarn add @lit-protocol/lit-node-client-nodejs


Isomorphic Implementation

Operable in both Node.js and the browser

yarn add @lit-protocol/lit-node-client


📝 If you're looking to use the Lit SDK, you're probably all set with just the lit-node-client .
Get started with interacting with Lit network!

Package Category Download
@lit-protocol/lit-node-client-nodejs lit-node-client-nodejs
@lit-protocol/lit-node-client lit-node-client

If you're a tech-savvy user and wish to utilize only specific submodules that our main module relies upon, you can find individual packages listed below. This way, you can import only the necessary packages that cater to your specific use case::

Package Category Download
@lit-protocol/access-control-conditions access-control-conditions
@lit-protocol/auth-helpers auth-helpers
@lit-protocol/bls-sdk bls-sdk
@lit-protocol/constants constants
@lit-protocol/contracts-sdk contracts-sdk
@lit-protocol/core core
@lit-protocol/crypto crypto
@lit-protocol/ecdsa-sdk ecdsa-sdk
@lit-protocol/encryption encryption
@lit-protocol/logger logger
@lit-protocol/misc misc
@lit-protocol/nacl nacl
@lit-protocol/pkp-base pkp-base
@lit-protocol/pkp-client pkp-client
@lit-protocol/pkp-cosmos pkp-cosmos
@lit-protocol/pkp-ethers pkp-ethers
@lit-protocol/pkp-sui pkp-sui
@lit-protocol/pkp-walletconnect pkp-walletconnect
@lit-protocol/sev-snp-utils-sdk sev-snp-utils-sdk
@lit-protocol/types types
@lit-protocol/uint8arrays uint8arrays
@lit-protocol/wrapped-keys wrapped-keys
@lit-protocol/auth-browser auth-browser
@lit-protocol/misc-browser misc-browser


Version Link
V6 (Beta) 6.x.x docs
V5 (Current) 5.x.x docs
V2 2.x.x docs

Contributing and developing to this SDK


  • node (v19.x or above)


Quick Start

The following commands will help you start developing with this repository.

First, install the dependencies via yarn:



You can build the project with the following commands:

// for local development - It stripped away operations that don't matter for local dev
yarn build:dev

// you should never need to use yarn build unless you want to test or publish it
yarn build

Run unit tests

yarn test:unit

Run E2E tests in nodejs

yarn test:local


Creating a new library

nx generate @nx/js:library

Create a new react demo app using the Lit JS SDK

yarn tools --create --react contracts-sdk --demo

Deleting a package or app

// delete an app from ./app/<app-name>
yarn delete:app <app-name>

// delete a package from ./packages/<package-name>
yarn delete:package <package-name>


yarn build

Building target package

yarn nx run <project-name>:build

Building Local Changes

During development you may wish to build your code changes in packages/ in a client application to test the correctness of the functionality.

If you would like to establish a dependency between packages within this monorepo and an external client application that consumes these packages:

  1. Run npm link at the root of the specific package you are making code changes in.
cd ./packages/*/<package-name>
npm link
  1. Build the packages with or without dependencies
yarn build
# or
yarn nx run lit-node-client-nodejs:build --with-deps=false
  1. In the client application, run npm link <package> --save to ensure that the package.json of the client application is updated with a file: link to the dependency. This effectively creates a symlink in the node_modules of the client application to the local dependency in this repository.
cd path/to/client-application
npm link <package> --save

Having done this setup, this is what the development cycle looks like moving forward:

  1. Make code change
  2. Rebuild specific package
  3. Rebuild client application.


You must have at least nodejs v18 to do this.

  1. Install the latest packages with yarn install

  2. Run yarn bump to bump the version

  3. Build all the packages with yarn build

  4. Run the unit tests with yarn test:unit & e2e node tests yarn test:local locally & ensure that they pass

  5. Update the docs with yarn gen:docs --push

  6. Finally, publish with the @cayenne tag: yarn publish:cayenne

  7. Commit these changes "Published version X.X.X"

Publishing to Serrano / Jalapno

git checkout serrano
yarn bump
yarn build
yarn node ./tools/scripts/pub.mjs --tag serrano-jalapeno


Quick Start on E2E Testing

The following will serve the react testing app and launch the cypress e2e testing after

yarn test:local

Unit Tests

yarn test:unit

Testing with a Local Lit Node

First, deploy your Lit Node Contracts, since the correct addresses will be pulled from the ../lit-assets/blockchain/contracts/deployed-lit-node-contracts-temp.json file.

Set these two env vars:

export LIT_JS_SDK_FUNDED_WALLET_PRIVATE_KEY="putAFundedPrivateKeyOnChronicleHere"


yarn update:contracts-sdk --fetch
yarn update:contracts-sdk --gen
yarn build:packages

To run manual tests:

 yarn nx run nodejs:serve

ENV Vars

  • LIT_JS_SDK_GITHUB_ACCESS_TOKEN - a github access token to get the contract ABIs from a private repo
  • LIT_JS_SDK_LOCAL_NODE_DEV - set to true to use a local node
  • LIT_JS_SDK_FUNDED_WALLET_PRIVATE_KEY - set to a funded wallet on Chronicle Testnet


...coming soon

Other Commands

Interactive graph dependencies using NX

yarn graph

FAQs & Common Errors

(React) Failed to parse source map from

In your React package.json, add GENERATE_SOURCEMAP=false to your start script


  "scripts": {
"start": "GENERATE_SOURCEMAP=false react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
Web bundling using esbuild

It’s currently using a custom plugin @websaam/nx-esbuild which is a fork from @wanews/nx-esbuild

"_buildWeb": {
"executor": "@websaam/nx-esbuild:package",
"options": {
"banner": {
"js": "import { createRequire } from 'module';const require = createRequire(import.meta.url);"
"globalName": "LitJsSdk_CoreBrowser",
"entryPoints": ["./packages/core-browser/src/index.ts"],
"define": { "global": "window" },
"package": "esbuild-node-builtins",
"function": "nodeBuiltIns"
Reference Error: crypto is not defined
import crypto, { createHash } from 'crypto';
Object.defineProperty(globalThis, 'crypto', {
value: {
getRandomValues: (arr: any) => crypto.randomBytes(arr.length),
subtle: {
digest: (algorithm: string, data: Uint8Array) => {
return new Promise((resolve, reject) =>
createHash(algorithm.toLowerCase().replace('-', ''))
error Command failed with exit code 13.

Make sure your node version is above v18.0.0

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