Gmail Data Extractor

Vern's Gmail extractor imports a new user's email data — messages, drafts, labels, and labels details — into your product through a single managed migration, handling Gmail's auth, pagination, and rate limits for you. It's built for teams onboarding customers off Gmail who want their data in your app from day one.

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Gmail

SaaS API (REST)

Managed auth, retries, and throttling

Normalized JSON, CSV, and DB-ready output

Cleaned JSON, CSV, and DB-ready output

Export coverage

Know exactly what Vern pulls before you migrate.

Objects Vern extracts

Vern extracts the full set of queryable Gmail objects (8 total), including: Drafts, Labels, Labels Details, Messages, Messages Details, Profile, Threads, and Threads Details. 1 of these support incremental change tracking, so syncs pull only what changed.

Output schema

Normalized JSON per object with referential keys preserved, so the relationships between your user's records survive the import. Timestamps are returned in ISO 8601. Delivered as JSON or CSV, or loaded straight into your own application database or pushed to your API — whatever your product expects.

Where it can land

Your own application database (Postgres, MySQL), a direct push to your API or webhook, or JSON/CSV files, plus another email system (BigMailer, Campaign Monitor, Campayn) when a user is switching tools.

Source details

Built for the source type shown above, with extractor content refreshed from the collection record.

Managed by Vern

The details you normally have to build yourself.

Authentication

OAuth 2.0 (Authorization Code flow). Your new user authorizes Gmail once during onboarding — their credentials never touch your code. Gmail access tokens are short-lived and refresh tokens roll on the provider's own schedule, so Vern manages the full token lifecycle and refresh and the import never drops midway. See Gmail's authentication guide.

Pagination

Vern detects and handles Gmail's paging model (cursor, page-number, or offset) internally and returns one consistent, de-duplicated result set — so you import a user's complete data without ever managing page tokens.

Rate limits and gotchas

Gmail enforces its own API rate limits (see Gmail's rate-limit docs). Vern queues and throttles requests internally so importing a new user's data never trips a 429 — even on a large account.

OAuth-based sources expire access tokens frequently and require a working refresh flow — a dropped refresh is the most common cause of a half-finished import. Vern owns the refresh loop so a new user's onboarding completes even on a long extraction.

API quickstart

1. Create a migration for Gmail
curl -X POST https://app.vern.so/api/v1/migrations \
  -H "x-api-key: $VERN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "name": "Gmail → Postgres", "source": "Gmail" }'
→ { "migration_id": "mig_..." }
2. Generate the extraction recipe (pulls live via the Gmail API)
curl -X POST https://app.vern.so/api/v1/migrations/$MIGRATION_ID/runs \
  -H "x-api-key: $VERN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "kind": "generate", "extract_via_api": true }'
3. Run the approved extraction
curl -X POST https://app.vern.so/api/v1/migrations/$MIGRATION_ID/runs \
  -H "x-api-key: $VERN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "kind": "execute" }'
4. Download the normalized CSV export
curl https://app.vern.so/api/v1/migrations/$MIGRATION_ID/exports/{template} \
  -H "x-api-key: $VERN_API_KEY" -o gmail_export.csv

A cleaner way to extract without rebuilding source-specific plumbing.

View docs

Common questions

Can I keep a user's Gmail data in sync after the first import? Yes — 1 Gmail objects support incremental change tracking, so after the first full import Vern pulls only what changed on re-run.

Can I move a user from Gmail to BigMailer? Yes — Vern normalizes the Gmail data model into typed tables that map cleanly onto BigMailer and into your own product.

What does it cost to read the Gmail API? Gmail's own API access follows Gmail's pricing/plan; Vern is billed separately per import. Check Gmail's developer docs for their current limits.