Packages

All packages in the ocpp-ws-io ecosystem — from the core RPC library to smart charging, version translation, CLI tooling, and the live browser simulator.

The ocpp-ws-io ecosystem is a modular suite of TypeScript packages, each solving a distinct challenge in EV charging infrastructure. Every package is designed to work independently or seamlessly together.

Core Packages

ocpp-ws-io

The foundational WebSocket RPC library. Unified client & server across OCPP 1.6, 2.0.1, and 2.1 with end-to-end type safety, JSON schema validation, Security Profiles 0–3 (mTLS), and Redis clustering.

ocpp-protocol-proxy

Transport-agnostic OCPP version translation proxy. Bridge legacy OCPP 1.6 chargers to modern 2.1 backends using pluggable middleware pipelines and pre-built translation presets.

ocpp-smart-charge-engine

Library-agnostic mathematical solver that distributes constraint-limited grid power fairly across active EV charging sessions. Supports equal-share, priority, and TOU pricing strategies.

Developer Tools

ocpp-ws-cli

Command-line toolbox for OCPP development. Scaffold projects, spin up mock CSMS servers, send test messages, generate TLS certificates, and run load tests — all from your terminal.

ocpp-ws-simulator

Full-featured browser GUI for visual debugging and demos. Connect to any CSMS, inspect live OCPP frames in real time, and simulate complete multi-charger sessions.

voltlog-io

High-performance structured logging layer powering the ecosystem's network diagnostics. Pluggable transports, correlation IDs, and OCPP-aware formatters.

Install at a Glance

# Core RPC — client & server
npm install ocpp-ws-io

# Version translation proxy
npm install ocpp-protocol-proxy

# Smart charging math
npm install ocpp-smart-charge-engine

# CLI tools (no install required)
npx ocpp-ws-cli --help

# Logging
npm install voltlog-io

Choosing the Right Package

Need	Package
Build a CSMS or charge point in Node.js	`ocpp-ws-io`
Support legacy 1.6 hardware on a 2.1 backend	`ocpp-protocol-proxy`
Distribute grid power across multiple chargers	`ocpp-smart-charge-engine`
Test, mock, or debug OCPP traffic locally	`ocpp-ws-cli`
Visualize OCPP sessions in the browser	`ocpp-ws-simulator`
Structured, performant logging	`voltlog-io`

All packages are independently installable. You don't need the full ecosystem — pick only what your project requires.

Interoperability

All packages share the same TypeScript type definitions for OCPP messages, meaning data flows between them without any manual type casting. See the Architecture Overview for how they wire together.