JavaScript Object Notation

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Introduction to JavaScript Object Notation (JSON) in JavaScript and .NET Continues …

The examples conferred to date illustrate victimisation string and numeric literals inside array and object literals. will|you’ll|you’ll be able to} additionally categorical a whole graph by victimisation the notation recursively such array components and object member values can themselves, in turn, use object and array literals. as an example, the subsequent piece illustrates associate degree object that has associate degree array as a member (PhoneNumbers), wherever the array consists of an inventory of objects.



From JavaScript Literals to JSON

SON could be a knowledge exchange format that was created from a set of the literal object notation in JavaScript. whereas the syntax accepted by JavaScript for literal values is incredibly versatile, it’s necessary to notice that JSON has a lot of stricter rules. in keeping with the JSON commonplace, as an example, the name of AN object member should be a legitimate JSON string. A string in JSON should be engulfed in quotation marks. JavaScript, on the opposite hand, permits object member names to be delimited by quotation marks or apostrophes or to omit quoting altogether see you later because the member name does not conflict with a reserved JavaScript keyword. Likewise, AN array component or AN object member price in JSON restricted|isrestricted|is proscribed} to a awfully limited set. In JavaScript, however, array components and object member values will check with just about any valid JavaScript expression, together with perform calls and definitions!

The charm of JSON is in its simplicity. A message formatted in keeping with the JSON commonplace consists of one ranking object or array. The array components and object values will be objects, arrays, strings, numbers, mathematician values (true and false), or null. That, during a shell, is that the JSON standard! It’s extremely that straightforward. See or RFC 4627 for a additional formal description of the quality.

One of the sore points of JSON is that the lack of a date/time literal. many of us area unit shocked and discomfited to find out this after they initial encounter JSON. the straightforward clarification (consoling or not) for the absence of a date/time literal is that JavaScript ne’er had one either: The support for date and time values in JavaScript is entirely provided through the Date object. Most applications exploitation JSON as a knowledge format, therefore, tend to use either a string or variety to specific date and time values. If a string is employed, you’ll be able to usually expect it to be within the ISO 8601 format. If variety is employed, instead, then the worth is sometimes taken to mean the amount of milliseconds in Universal Coordinated Time (UTC) since epoch, wherever epoch is outlined as hour Jan one, 1970 (UTC). Again, this is often a mere convention and not a part of the JSON commonplace. If you’re exchanging knowledge with another application, you’ll ought to check its documentation to envision however it encodes date and time values at intervals a JSON literal. as an example, Microsoft’s ASP.NET Ajax uses neither of the represented conventions. Rather, it encodes .NET DateTime values as a JSON string, wherever the content of the string is \/Date(ticks)\/ and wherever ticks represents milliseconds since epoch (UTC). thus Gregorian calendar month twenty nine, 1989, 4:55:30 AM, in UTC is encoded as “\/Date(628318530718)\/”.


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