Set a key's value
Creates or replaces the value for a key. The request body is stored verbatim as the value — no base64, no JSON envelope — up to 1 MiB. The request's Content-Type header is stored with the value and echoed back on retrieval. Returns 201 when the key is created and 200 when an existing key is updated.
Path parameters
KV namespace ID
Key name. Allowed characters: a-z A-Z 0-9 - _ / = .; maximum 256 characters; names starting with _ are reserved for system use. May contain /. When calling the HTTP API directly, URL-encode the key so the whole string is treated as one key (for example user/1 -> user%2F1). SDK users should pass the key raw - SDKs URL-encode path parameters automatically.
Query parameters
Time-to-live in seconds. When set, the key expires and is deleted after this duration. Requires a namespace provisioned with TTL support; namespaces without it return a 409.
Response
Key updated