MLE JavaScript Support for JSON

Supported conversions between JavaScript and the JSON data type.

Values of the SQL JSON type can be converted to and from JavaScript values. The type mapping between the SQL JSON type and JavaScript values is aligned with type mappings employed by the node-oracledb driver.

Note: For more information about node-oracledb and the JSON data type, see the node-oracledb documentation.

Values of the SQL JSON type are converted to JavaScript values as follows:

• If the JSON value is an object, it is converted to an equivalent JavaScript object by converting all fields of the input object.

• If the JSON value is an array, it is converted to an equivalent JavaScript array by converting all elements of the input array.

• If the JSON value is a scalar value, it is converted to an equivalent value according to the type mapping in the table Mapping from JSON Attribute Types and Values to JavaScript Types and Values.

Mapping from JSON Attribute Types and Values to JavaScript Types and Values

JSON Attribute Type or Value	JavaScript Type or Value
null	null
false	false
true	true
NUMBER	Number
VARCHAR2	String
RAW	Uint8Array
CLOB	String
BLOB	UintArray
DATE	Date
TIMESTAMP	Date
INVERVAL YEAR TO MONTH	OracleIntervalYearToMonth
INTERVAL DAY TO SECOND	OracleIntervalDayToSecond
BINARY_DOUBLE	Number
BINARY_FLOAT	Number
Arrays	Array
Objects	A plain JavaScript Object

Values of a JavaScript type are converted to the SQL JSON type as follows:

• If the JavaScript value matches one of the scalar types in the first column of the table Mapping from JavaScript Types and Values to JSON Attributes and Values, it is converted to a JSON value of the corresponding type.

• If the JavaScript value is an array, it is converted to a JSON array by converting all elements of the array. Note that Uint8Array values are treated as scalars as opposed to arrays, so Uint8Array values are converted to the type RAW, not to a JSON array.

• If the JavaScript value is an object that is neither an array nor matches any of the JavaScript types/ classes listed in the table Mapping from JavaScript Types and Values to JSON Attributes and Values, it is converted to a JSON object. Each field of the object is converted according to the appropriate mappings.

Mapping from JavaScript Types and Values to JSON Attributes and Values

JavaScript Type or Value	JSON Attribute Type or Value
null	null
undefined	null
string	VARCHAR2
true	true
false	false
Uint8Array	RAW
Number	NUMBER
Date	DATE
OracleNumber	NUMBER
OracleDate	DATE
OracleTimestamp	TIMESTAMP
OracleTimestampTZ	TIMESTAMP WITH TIME ZONE
OracleIntervalYearToMonth	INVERVAL YEAR TO MONTH
OracleIntervalDayToSecond	INTERVAL DAY TO SECOND
Array	Array
Object	Object