glean-local-dev-loop

Development

Configure Glean local development with mock search responses, test datasources, and connector development workflow. Trigger: "glean dev setup", "glean local development", "glean connector development".

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Glean Local Dev Loop

Overview

Local development workflow for Glean enterprise search API integration. Provides a fast feedback loop with mock search results, connector testing, and document indexing simulation so you can build custom datasource connectors and search UIs without needing a live Glean deployment. Toggle between mock mode for rapid connector iteration and sandbox mode for validating against your Glean instance.

Environment Setup

cp .env.example .env
# Set your credentials:
# GLEAN_API_KEY=glean_xxxxxxxxxxxx
# GLEAN_INSTANCE=https://your-company.glean.com
# MOCK_MODE=true
npm install express axios dotenv tsx typescript @types/node
npm install -D vitest supertest @types/express

Dev Server

// src/dev/server.ts
import express from "express";
import { createProxyMiddleware } from "http-proxy-middleware";
const app = express();
app.use(express.json());
const MOCK = process.env.MOCK_MODE === "true";
if (!MOCK) {
  app.use("/api", createProxyMiddleware({
    target: process.env.GLEAN_INSTANCE,
    changeOrigin: true,
    headers: { Authorization: `Bearer ${process.env.GLEAN_API_KEY}` },
  }));
} else {
  const { mountMockRoutes } = require("./mocks");
  mountMockRoutes(app);
}
app.listen(3003, () => console.log(`Glean dev server on :3003 [mock=${MOCK}]`));

Mock Mode

// src/dev/mocks.ts — realistic enterprise search responses
export function mountMockRoutes(app: any) {
  app.post("/api/search", (req: any, res: any) => res.json({
    results: [
      { title: "Q4 Engineering Roadmap", url: "https://wiki.co/roadmap", score: 0.97, datasource: "confluence",
        snippets: [{ snippet: "The <b>roadmap</b> includes migration to..." }] },
      { title: "Onboarding Guide", url: "https://wiki.co/onboard", score: 0.88, datasource: "notion",
        snippets: [{ snippet: "New hire <b>onboarding</b> steps..." }] },
    ],
    totalCount: 2,
  }));
  app.post("/api/index/documents", (req: any, res: any) => res.json({
    status: "OK", documentsIndexed: req.body.documents?.length || 0,
  }));
  app.get("/api/datasources", (_req: any, res: any) => res.json([
    { name: "confluence", displayName: "Confluence", docCount: 1250 },
    { name: "notion", displayName: "Notion", docCount: 430 },
  ]));
}

Testing Workflow

npm run dev:mock &                    # Start mock server in background
npm run test                          # Unit tests with vitest
npm run test -- --watch               # Watch mode for rapid iteration
MOCK_MODE=false npm run test:integration  # Integration test against real Glean instance

Debug Tips

Use curl -X POST http://localhost:3003/api/search -d '{"query":"test"}' to verify mock search
Glean connectors must return documents with id, title, body.textContent, and datasource fields
Check connector transform output shape before pushing to the indexing API
Enable verbose logging on the Glean SDK client to trace API call timing
Verify OAuth scopes if search returns empty results against a live instance

Error Handling

Issue	Cause	Fix
`401 Unauthorized`	Invalid API key or expired token	Regenerate at Glean admin console
`403 Forbidden`	Key lacks indexing scope	Request Indexing API permissions from admin
`400 Bad Request`	Malformed document payload	Validate required fields: id, title, body
`429 Rate Limited`	Too many indexing requests	Batch documents (max 100 per request)
`ECONNREFUSED :3003`	Dev server not running	Run `npm run dev:mock` first

Resources

Glean Indexing API
Glean Search API

Next Steps

See glean-debug-bundle.