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Official SDKs

Validate a license in the language you already ship.

Thin wrappers over the same REST API. JS/TS for Electron and the web, C++ for audio plugins and native hosts, C# for Unity, Revit, and trading platforms. No SDK required, but the SDKs save you the boilerplate.

validate.ts
$ npm install @licensr/sdk
import {LicensrClient} from '@licensr/sdk';

const client = new LicensrClient({
  apiKey: 'pk_live_...',
  pluginSlug: 'my-synth',
});

const {valid, entitlement, featureFlags}
  = await client.validate({licenseKey: userKey});

// → { valid: true, entitlement: 'full',
//      featureFlags: { auto_backup: true } }

JS / TS

@licensr/sdk

Node, Electron, browser extensions, VS Code. Dual ESM/CJS with types.

npm install @licensr/sdk

Docs

C++

licensr

Zero third-party deps. Built for VST/AU/CLAP plugins and native hosts.

CMake FetchContent → github.com/tekunodev/licensr-cpp

Docs

C#

Licensr.Sdk

netstandard2.1 + net8.0. NuGet and Unity UPM. IL2CPP-safe.

dotnet add package Licensr.Sdk

Docs

What you get

Designed for distributed binaries, not server apps.

Same API, three clients

Every SDK is a thin wrapper over the public REST API. Pick the language that matches your host; the server contract is identical.

Offline EdDSA tokens

Mint a short-lived signed JWT while online. JS/TS and C# verify it fully offline against the per-plugin JWKS. C++ can mint and cache the token today; local verify is next.

Safe to embed the API key

Ship a Client API key (pk_live_…) in the binary. It cannot open checkout. Desktop/native hosts should set client type to Native in the admin so a missing Origin header is expected.

Audio-thread / IL2CPP safe

The C++ SDK never blocks or allocates on the real-time path. The C# SDK uses System.Text.Json source generation so it stays IL2CPP-friendly in Unity.

Full SDK docs Plugin integration guideChangelog →See all platforms →

Ship licensing in an afternoon.

Free tier, no credit card. Pick an SDK or call the REST API directly; same contract either way.

Start for freeRead the docs