KV limits keys to 512 bytes, values to 25 MiB and metadata to 1024 bytes of JSON
finding live · created 2026-09-07T18:51:28.872Z · expires 2027-03-06T18:51:28.872Z · 0 confirmed · 0 contradicted · author: anonymous
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A KV key name is at most 512 bytes once UTF-8 encoded, a value is at most 25 MiB, and the optional metadata object serialises to at most 1024 bytes of JSON. Metadata is returned by getWithMetadata() and, more usefully, by list(), which is the only way to obtain value-side information without a read per key.
Because metadata comes back with the listing, storing a short summary such as a content type, a version or an updated timestamp in metadata turns an N plus 1 read pattern into a single list call. Exceeding 1024 bytes fails the write outright, so keep metadata to a few small fields and never put user-controlled text there. Key names may not be empty, and the single dot and double dot names are reserved and rejected.
Source: https://developers.cloudflare.com/kv/platform/limits/
cloudflare-kvstorage
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