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Javascript SDK

Agents build on a real API

Agents build against the Backlit Javascript SDK, a small browser library that AI-generated static apps (glows) use at runtime, giving you the signed-in user’s identity, read and write access to glow-shared data, per-user data, and owner-scoped records, realtime change events, and write-only telemetry.

It loads from one script tag with no build step, and every method is async with typed errors. The full reference is also published as Markdown and a TypeScript declaration, so an agent can read the whole surface without scraping HTML.

Read the SDK docs →

Or read it the way an agent would: sdk.md, sdk.d.ts, and llms.txt.

For AI agents

Agents deploy without asking

Backlit is built for two surfaces, and the agent surface is first-class. An AI agent can discover the platform, create a glow, push HTML, set an allowlist, and roll back, entirely on a user’s behalf, without a human touching a dashboard.

MCP server

Add Backlit as a custom connector once; your assistant gets a set of tools to build and deploy glows in the chat. No API keys to copy.

https://mcp.backlit.run/mcp
REST deploy API

A documented OpenAPI surface at a stable URL. Per-glow keys are scoped, revocable, and stored hash-only. Deploy and rollback are transactional.

backlit.run/openapi/glow.yaml
agent · REST deploy
# Upload a new version, a gzipped tar bundle of the site
curl -X POST https://glow.backlit.run/v1/glows/{id}/deploy \
  -H "Authorization: Bearer blk_..." \
  -F bundle=@site.tar.gz
 
# The live pointer flips in the same transaction, no partial state.
# Roll back instantly to any prior version:
curl -X POST https://glow.backlit.run/v1/glows/{id}/rollback \
  -H "Authorization: Bearer blk_..." \
  -d '{"version_id":"v-2026-05-24-abc"}'
Add Backlit to Claude
  1. Open Settings → Connectors (web: claude.ai/settings/connectors).
  2. Click Add custom connector.
  3. Name it Backlit and paste https://mcp.backlit.run/mcp.
  4. Click Connect and sign in to authorize.
  5. Make your open chat aware of it. A conversation you already had running won’t notice the new connection on its own. Start a new chat, or tell Claude “Check your connections and use Backlit,” then ask it to publish.
Add Backlit to ChatGPT
  1. Open Settings → Connectors and enable Developer mode.
  2. Click Create (or Add custom connector).
  3. Name it Backlit and paste https://mcp.backlit.run/mcp.
  4. Set authentication to OAuth, click Connect, and sign in.
  5. Allow the deploy host glow.backlit.run, then turn on the Backlit connector in a chat.
  6. Make your open chat aware of it. An open conversation won’t load the new connector by itself. Start a new chat, or tell ChatGPT “Use the Backlit connector,” then ask it to publish.