VS Code Extension Developer Leads: Publisher Contacts

Turn the VS Code Marketplace into a targeted B2B lead list. Search extensions by keyword or category and get one JSON row per publisher: company or developer name, verified domain, website, GitHub repo, scraped contact emails, total installs across their matched extensions, and their top extensions with install counts. Keyless official Marketplace API plus a light website email scrape: no login, no browser, no data subscription.

Built for devtool, API, and cloud vendors selling to extension authors, AI coding tool companies, developer marketing and DevRel agencies, and recruiters sourcing engineers with proven shipped tools.

What you get

One row per publisher, with:

• publisher, publisherHandle, publisherId, domainVerified
• website, githubRepo, websiteReachable, marketplaceUrl
• email, emails, likelyContactEmails, mxFound
• extensionCount, totalInstalls, avgRating
• topExtensions (name, installs, rating, last update, marketplace URL)
• categories, matchedQueries

Input

• keywords (marketplace search terms, e.g. database, kubernetes, ai assistant)
• categories (official categories, e.g. AI, Programming Languages, Data Science, Testing)
• minInstalls (only publishers with at least this many total installs; use 10000+ for established companies)
• maxPublishers (default 50, up to 500)
• includeEmail (scrape each publisher's website for public contact emails)
• maxEmailLookups (cap on website fetches)
• dedupe (skip previously returned publishers; built for scheduled prospecting)

Example input

{
  "keywords": ["database", "sql"],
  "minInstalls": 10000,
  "maxPublishers": 100,
  "includeEmail": true
}

Example output

{
  "publisher": "Database Client",
  "publisherHandle": "cweijan",
  "domainVerified": true,
  "website": "https://database-client.com",
  "githubRepo": "https://github.com/database-client/jdbc-adapter-server",
  "email": "support@database-client.com",
  "emails": ["support@database-client.com"],
  "extensionCount": 3,
  "totalInstalls": 4210530,
  "avgRating": 4.7,
  "topExtensions": [
    { "name": "vscode-database-client2", "displayName": "Database Client", "installs": 3959207, "rating": 4.68, "url": "https://marketplace.visualstudio.com/items?itemName=cweijan.vscode-database-client2" }
  ],
  "categories": ["Programming Languages", "Other"],
  "marketplaceUrl": "https://marketplace.visualstudio.com/publishers/cweijan"
}

Uses

• Devtool and API vendors: every publisher shipping extensions in your category, ranked by installs, with a contact email
• AI coding tool companies: publishers of AI, Copilot-adjacent, and LLM extensions to partner with or acquire
• DevRel and developer marketing agencies: proven ecosystem builders segmented by category and traction
• Recruiters: developers with shipped tools and real install numbers, plus their GitHub
• Scheduled prospecting with dedupe on: only new publishers each run
• Chain website values into the Website Contact Scraper for deeper outreach data

Pricing

Pay per publisher row: a higher rate for rows with a scraped contact email, a lower rate for the rest. Searches that match nothing cost nothing, and the first 2 rows of every run are free so you can validate output before you scale up.

Notes

• Data comes from the official VS Code Marketplace gallery API. Install counts and ratings are aggregated across the publisher's extensions that matched your search, not their entire catalog.
• Emails are scraped from the publisher's own public website (verified domain first, then extension homepage links). GitHub-only publishers get the repo link but usually no email.
• likelyContactEmails adds standard patterns (info@, contact@, hello@, support@) on the publisher's domain; mxFound tells you the domain accepts mail.
• One publisher row can represent many extensions, so a 100-row run can cover several hundred extensions.