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Increased blob size limits in Workers Analytics Engine

Jun 20, 2025, 11:29 AM

Workers

We’ve increased the total allowed size of blob fields on data points written to Workers Analytics Engine from 5 KB to 16 KB.

This change gives you more flexibility when logging rich observability data — such as base64-encoded payloads, AI inference traces, or custom metadata — without hitting request size limits.

You can find full details on limits for queries, filters, payloads, and more here in the Workers Analytics Engine limits documentation.

JavaScript

export default {
  async fetch(request, env) {
    env.analyticsDataset.writeDataPoint({
      // The sum of all of the blob's sizes can now be 16 KB
      blobs: [
        // The URL of the request to the Worker
        request.url,
        // Some metadata about your application you'd like to store
        JSON.stringify(metadata),
        // The version of your Worker this datapoint was collected from
        env.versionMetadata.tag,
      ],
      indexes: ["sample-index"],
    });
  },
};

TypeScript

export default {
  async fetch(request, env) {
    env.analyticsDataset.writeDataPoint({
      // The sum of all of the blob's sizes can now be 16 KB
      blobs: [
        // The URL of the request to the Worker
        request.url,
        // Some metadata about your application you'd like to store
        JSON.stringify(metadata),
        // The version of your Worker this datapoint was collected from
        env.versionMetadata.tag,
      ],
      indexes: ["sample-index"],
    });
  }
};