JSON.SET key path value [ NX | XX]
Available in: Redis Stack
Time complexity: O(M+N) when path is evaluated to a single value where M is the size of the original value (if it exists) and N is the size of the new value, O(M+N) when path is evaluated to multiple values where M is the size of the key and N is the size of the new value
Sets the JSON value at path in key.
For new Redis keys the path must be the root. For existing keys, when the entire path exists, the value that it contains is replaced with the json value. For existing keys, when the path exists, except for the last element, a new child is added with the json value.
Adds a key (with its respective value) to a JSON Object (in a RedisJSON data type key) only if it is the last child in the path, or it is the parent of a new child being added in the path. The optional subcommands modify this behavior for both new RedisJSON data type keys as well as the JSON Object keys in them:
NX- only set the key if it does not already existXX- only set the key if it already exists
Return
[] if the specified NX or XX
conditions were not met.
Examples
Replacing an existing value
redis> JSON.SET doc $ '{"a":2}'
OK
redis> JSON.SET doc $.a '3'
OK
redis> JSON.GET doc $
"[{\"a\":3}]"
Adding a new value
redis> JSON.SET doc $ '{"a":2}'
OK
redis> JSON.SET doc $.b '8'
OK
redis> JSON.GET doc $
"[{\"a\":2,\"b\":8}]"
Updating multi paths
redis> JSON.SET doc $ '{"f1": {"a":1}, "f2":{"a":2}}'
OK
redis> JSON.SET doc $..a 3
OK
redis> json.get doc
"{\"f1\":{\"a\":3},\"f2\":{\"a\":3}}"