Fields Address and Phone each have an object value. Field name has a string value ( "Alexis Bull"). This object has three members, with fields name, Address, and Phone. For example: field User has value "ABULL".įields PONumber and zipCode have numeric values: 166.įield Shipping Instructions has an object as value. Array element order is significant.Įxample 39-1 shows a JSON object that represents a purchase order, with top-level field names PONumber, Reference, Requestor, User, Costcenter, ShippingInstruction, Special Instructions, AllowPartialShipment and LineItems. In JSON an array is represented by brackets ( ) surrounding the representations of the array elements, which are separated by commas ( ,), and each of which is an object, an array, or a scalar value. See also " Unique Versus Duplicate Fields in JSON Objects".Ī JavaScript array has zero or more elements. It is unspecified which of multiple such members is used. The JSON path evaluation that Oracle Database employs always uses only one of the object members that have a given field name any other members with the same name are ignored. Foot 4Įach field name in a given JSON object is not necessarily unique the same field name may be repeated. Order is not significant among object members.Ī JSON field name can be empty ( ""). An object property name-value pair is often called an object member. A JSON number (numeral) is represented in decimal notation, possibly signed and possibly including a decimal exponent.Īn object property is often called a field. It can also be enclosed in single quotation marks ( ').Īs a result of this difference, in practice, data that is represented using unquoted or single-quoted property names is sometimes referred to loosely as being represented in JSON, and some implementations of JSON, including the Oracle Database implementation, support the lax syntax that allows the use of unquoted and single-quoted property names.Ī string in JSON is composed of Unicode characters, with backslash ( \) escaping. In JavaScript notation, a property name used in an object literal can be, but need not be, enclosed in double quotation marks. In JSON each property name and each string value must be enclosed in double quotation marks ( "). Foot 3 It is written as such a property list enclosed in braces ( ), with name-value pairs separated by commas ( ,), and with the name and value of each pair separated by a colon ( :).
Foot 2 A JSON object is a JavaScript object literal. In particular, SQL condition IS NULL condition returns false for a JSON null value, and SQL condition IS NOT NULL returns true.Ī JavaScript object is an associative array, or dictionary, of zero or more pairs of property names and associated JSON values. It is not NULL, which in SQL represents the absence of a value (missing, unknown, or inapplicable data).
It is often used for serializing structured data and exchanging it over a network, typically between a server and web applications.Ī JSON value of null is a value as far as SQL is concerned.
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JSON is relatively easy for humans to read and write, and easy for software to parse and generate. A variety of programming languages can parse and generate JSON data. It is a text-based way of representing JavaScript object literals, arrays, and scalar data.Īlthough it was defined in the context of JavaScript, JSON is in fact a language-independent data format. In this it has much in common with XML.īecause it is (almost a subset of) JavaScript notation, JSON can often be used in JavaScript programs without any need for parsing or serializing. Foot 1 Because it can be used to represent JavaScript object literals, JSON commonly serves as a data-interchange language. JSON is almost a subset of the object literal notation of JavaScript. The JavaScript dialect of ECMAScript is a general programming language used widely in web browsers and web servers. JavaScript Object Notation ( JSON) is defined in standards ECMA-404 (JSON Data Interchange Format) and ECMA-262 (ECMAScript Language Specification, third edition).
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