Documentation / Overview

Lightstreamer Workbench

A developer-tools extension for Chrome and desktop Firefox. Inspect the official Lightstreamer Web Client and test how an application handles updates and messages.

Start with a live page

Install Workbench from the Chrome Web Store. Check release notes for Firefox availability. Open developer tools on the application page and select Workbench. The getting started guide shows how to check Capture and inspect your first Session.

Read the workspace

Workbench organizes the inspected page into three parts. Select where to look, read what happened, then inspect the selected record.

Workbench panel with Runtime Scope on the left, Ordered Evidence in the center, and Context on the right. — **Runtime Scope** selects a client, Session, or Subscription. **Ordered Evidence** lists captured activity. **Context** shows details for the selected record.

Choose a task

Inspect activityFind a Session, Subscription, or Item Update in captured Evidence. Test an Item UpdateDeliver a Local Injection to the page without a backend change. Send a Client MessageReview a Server Injection sent through the client's current Session.

Connect an MCP agent

Agent access needs Node.js 22.12+, the npm companion, and an MCP app. Run setup and add its output to the app's MCP settings. The app starts the companion. Requested Evidence may reach your model provider. Follow the MCP setup guide.

Data in this session

Workbench keeps temporary Evidence in the browser. An export is a deliberate download. See export and privacy for storage and sharing details.