- Category
- Developer Tools
- Rank
- No. 747Tools index
Previous survey · No. 759 ·
- Pricing
- Open Source
- Type
- TOOL
- Builder
- getsentry
- GitHub
- 619 stars
- Latest release
- @spotlightjs/spotlight@4.11.8
- Date
About
Sentry for local development. Drop-in dev-time error and trace inspector that surfaces issues in your browser while you build.
What it does
Spotlight collects telemetry from Sentry SDKs and routes it through a local Sidecar proxy. Developers can inspect errors, traces, logs, attachments, and performance data in a web interface, terminal stream, desktop application, or connected AI coding assistant.
Why it's ranked here
Spotlight covers an unusually complete local debugging loop. It can configure a launched command, collect several telemetry types, present multiple projects together, and expose the same evidence to humans or AI tools. Its strongest fit is already instrumented applications, while its macOS-only desktop option and Sentry SDK foundation narrow the audience.
What's good
One telemetry pipeline serves several workflows. The browser interface supports visual inspection, terminal output offers human, logfmt, JSON, and Markdown formats, and the MCP server supports both standard input and HTTP. Spotlight can run beside an existing Sentry setup without interference, reducing the cost of adding it to an established workflow.
Tradeoffs
The native desktop application is documented only for macOS. The command-line package requires Node 20 or newer, and telemetry capture depends on Sentry SDKs. Browser end-to-end coverage targets Chromium, so the supplied repository text does not demonstrate equivalent automated coverage across Firefox or Safari.
How to use it well
Use Spotlight when developers already have, or can add, Sentry instrumentation and want immediate telemetry during coding. Let it launch the application for automatic configuration, tail focused event types in scripts, or feed concrete failures to an MCP-capable assistant. The supplied material presents local development tooling, not a hosted production telemetry service.
Technical notes+
The root package.json defines a private ESM pnpm and Turbo monorepo with Node >=20. packages/spotlight/vite.node.config.ts builds the CLI plus server/main and server/sdk as preserved ES modules, adds a Node shebang, and targets Node 20. packages/spotlight/src/run.ts loads bundled UI assets, starts Sentry spans around setup, and invokes the server CLI. packages/spotlight/vitest.config.ts covers source-level unit tests with happy-dom and V8 coverage in CI. packages/spotlight/vitest.cli.config.ts covers CLI end-to-end tests, while packages/spotlight/playwright.config.ts runs Chromium UI tests with retry traces, failure screenshots, and retained failure videos. packages/spotlight/vite.electron.config.ts separately builds the Electron main process and renderer.
Observed
- Primary implementation
- TypeScript and JavaScript in an ESM monorepo
- Package management
- pnpm workspace with Turbo build orchestration
- Install surface
- npm package runnable through npx
- Interfaces
- Browser UI, CLI, MCP over standard input and HTTP, and a desktop application
- Platform support
- Desktop application for macOS; CLI requires Node 20 or newer
- Testing structure
- Vitest unit and CLI end-to-end configurations plus Playwright Chromium UI tests
Read from README.md, package.json, packages/website/astro.config.mjs, packages/spotlight/vitest.config.ts, packages/spotlight/vite.ui.config.ts, packages/spotlight/vite.dev.config.ts, packages/spotlight/vite.config.base.ts, packages/spotlight/vite.node.config.ts, packages/spotlight/playwright.config.ts, packages/spotlight/vitest.cli.config.ts, packages/spotlight/test_formatter_fix.js, packages/website/sentry.client.config.mjs, packages/spotlight/vite.electron.config.ts, packages/spotlight/src/run.ts, packages/website/src/env.d.ts.
What it can do
Monitor application errors in real-time during development
Running local development application → Real-time error notifications and details in browser
Display execution traces for debugging
Application code execution flow → Visual trace inspector with execution details
Surface runtime issues during development
Local development environment activity → Issue alerts and diagnostic information
Integrate error tracking into development workflow
Existing development setup → Drop-in error monitoring solution
Inspect application performance during build process
Development build execution → Performance insights and bottleneck identification
Intel on Spotlight
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