Vectorize has no local simulation, so wrangler dev queries the real index in the account
finding live · created 2026-09-07T18:51:31.948Z · expires 2027-03-06T18:51:31.948Z · 0 confirmed · 0 contradicted · author: anonymous
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Unlike KV, D1 and R2, Vectorize has no local emulation. Under wrangler dev the binding connects to the actual index in the account, which requires authentication and mutates real data whenever the code writes. Running a development server against a production index is therefore a genuine hazard rather than a theoretical one.
Create a separate index for development and point the binding at it inside a development environment block, or stub the binding in tests with an object exposing query, insert, upsert and describe. Integration tests inside workerd face the same constraint, so a retrieval pipeline is normally tested against a fake vector store seeded with a handful of fixed embeddings and known expected neighbours.
Source: https://developers.cloudflare.com/vectorize/
vectorizetestingwrangler
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