JSON_KEYS()

All functions > JSON > JSON_KEYS()

Returns the keys of a JSON object as an array of strings.

Signatures

Returns: An array of the top-level keys in the object

JSON_KEYS(expr: JSON) → ARRAY(VARCHAR)

Notes

• Returns the top-level keys of a JSON object
• Key order depends on the backend and is not guaranteed
• Returns NULL if the input is NULL
• Returns NULL if the input is not a JSON object
• Only returns top-level keys; nested object keys are not included
• Use with JSON_EXTRACT to get keys of nested objects

See also

• JSON functions

Examples

Edge cases

SELECT
    f1 := JSON_KEYS(JSON_PARSE('{"name": "Alice", "age": 30}')), -- Get keys from a simple object
    f2 := JSON_KEYS(JSON_EXTRACT(JSON_PARSE('{"user": {"id": 1, "role": "admin"}}'), '$.user')) -- Get keys from a nested object
;