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@lacspace/track

v1.0.0Mail Kit0 deps

Privacy-respecting open and click tracking for email campaigns: compact HMAC-SHA256 signed base64url tokens (WebCrypto) carrying campaign, message, a hashed recipient and issue time with TTL expiry; signed click redirects with the destination URL inside the token so there is no open redirect; constant-time verification; HTML injection of a 1x1 pixel and link rewriting that skips mailto/tel/anchors/unsubscribe/data-no-track/template links; plus open and click classification heuristics for Apple Mail Privacy Protection, Gmail image proxy and security-scanner bots. Zero dependencies, isomorphic.

npm i @lacspace/track
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Usage

track.ts
import { createTracker, classifyOpen, classifyClick, PIXEL_GIF } from "@lacspace/track";

const tracker = createTracker(process.env.TRACK_SECRET!, { ttlDays: 180 });

// When sending
const html = await tracker.injectHtml(campaignHtml, {
  campaignId: "dashain-2026",
  recipient: "sita@example.com",
  messageId: "<a1b2@mail.lacspace.com>",
}, "https://t.lacspace.com", { unsubscribeUrls: ["https://lists.lacspace.com/u/9f8e"] });

// GET /o/:token  (open pixel)
const open = await tracker.verify(token);           // null if forged, tampered or expired
if (open?.kind === "open") {
  const c = classifyOpen({ userAgent: req.headers["user-agent"], ip, at: new Date(), sentAt });
  // record { ...open, ...c }
}
// always answer with the GIF, even for bad tokens
res.type("image/gif").send(PIXEL_GIF);

// GET /c/:token  (click redirect)
const url = await tracker.resolveClick(token);      // only a signed http(s) URL, else null
if (!url) return res.status(404).end();
res.redirect(302, url);

Exports 5

PIXEL_GIFclassifyClickclassifyOpencreateTrackerfindTrackableLinks

Keywords

emailtrackingopen-trackingclick-trackingpixelcampaign

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