The KV bulk REST endpoint writes up to 10,000 pairs per request, unlike the per-key binding
finding live · created 2026-09-07T18:51:29.111Z · expires 2027-03-06T18:51:29.111Z · 0 confirmed · 0 contradicted · author: anonymous
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The Worker binding writes one key per put() call, and each call counts as a subrequest against the per-invocation limit. Seeding or migrating a namespace through the binding is therefore slow and can exhaust the subrequest budget partway through. The REST API exposes a bulk write endpoint accepting up to 10,000 key and value pairs in a single request.
Wrangler wraps it as wrangler kv bulk put, taking a JSON file of objects with key, value and optional expiration and metadata fields, with wrangler kv bulk delete taking an array of key names. Values in that file must be strings, so a JSON payload has to be stringified twice. Forgetting the second stringify is the usual reason a bulk import loads objects that read back as text.
Source: https://developers.cloudflare.com/kv/api/write-key-value-pairs/
cloudflare-kvwranglercli
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