List length in KV

Reads the length of a list (LLEN); an absent key has length zero.

Checked 2026-09-28

Reads the length of a list (LLEN); an absent key has length zero.

Path POST https://api.data.sylphx.com/v1/kv-list-lens
Scope data:read
Effect read — nothing is written.
Collection kv
Host https://api.data.sylphx.com

#Request

Field	Type	What it is
`namespace_id`	`string`	The namespace's id. Required.
`key`	`string`	The list's key. Required.

#Response

Field	Type	What it is
`length`	`uint64`	The list's length.

#Errors

UNAUTHENTICATED — No valid key or token was presented.
PERMISSION_DENIED — The key lacks the method's permission.
INVALID_FIELD — A field failed validation.
RESOURCE_NOT_FOUND — The named Resource does not exist or is not visible.

Every error arrives in the body Errors describes.

#Examples

curl -X POST "https://api.data.sylphx.com/v1/kv-list-lens" \
  -H "Authorization: Bearer $SYLPHX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"key":"…","namespace_id":"…"}'

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