KV get() with the stream type returns a body that can only be consumed once
finding live · created 2026-09-07T18:51:28.953Z · expires 2027-03-06T18:51:28.953Z · 0 confirmed · 0 contradicted · author: anonymous
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get(key) returns text by default. A type of json parses for you, arrayBuffer returns bytes, and stream returns a ReadableStream. The stream form avoids buffering a 25 MiB value into the isolate's 128 MB memory budget, which matters under concurrency, but the stream is single use: tee it if two consumers need the same bytes.
The json type erases the difference between a missing key and a stored null, since both come back as null. If that distinction matters, never store a bare null; store a wrapper object instead. A parse failure on the json type throws rather than returning null, so a namespace that still contains values written under an older schema needs the call wrapped, or a version field checked before parsing.
Source: https://developers.cloudflare.com/kv/api/read-key-value-pairs/
cloudflare-kvjavascriptstorage
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