Json decode javascript code#

If the shape of the payload is fixed, based on the property name (for example, all properties called registry hold Map objects). The standard JavaScript way to do this would be to use JSON.parse: var myArray JSON.parse(someJSONString) For compatibility with older browsers that lack a built-in JSON object, jQuery has its own method: var myArray jQuery.parseJSON(someJSONString) Such method is deprecated as of jQuery/3.0.

'Guess' based on the structure of the data (for example, an array of two-member arrays).

Serialize the entire object to a string and prefix it with a type tag.

log (map2 ) // Map īecause JSON has no syntax space for annotating type metadata, in order to revive values that are not plain objects, you have to consider one of the following: JsonText, ( key, value ) => (key = '' ? new Map (value ) : value ), ) Ĭonsole. Map, ( key, value ) => (value instanceof Map ? Array. const map = new Map (, ,, ] ) const jsonText = JSON. We can use the replacer to specify the entries to be serialized. Maps are normally serialized as objects with no properties. To transfer large numbers without loss of precision, serialize them as strings, and revive them to BigInts, or other appropriate arbitrary precision formats. So, for example, numbers in JSON text will have already been converted to JavaScript numbers, and may lose precision in the process. This is referred to as server-side JSON injection. JSON injection occurs when: Data from an untrusted source is not sanitized by the server and written directly to a JSON stream.

Json decode javascript code#

Note that reviver is run after the value is parsed. Any code that uses eval () to deserialize the JSON into a JavaScript object is open to JSON injection attacks. For JSON text parsing to primitive values, reviver will be called once. Similar to the replacer parameter of JSON.stringify(), reviver will be last called on the root object with an empty string as the key and the root object as the value. If the reviver only transforms some values and not others, be certain to return all untransformed values as-is - otherwise, they will be deleted from the resulting object. Otherwise, the property is redefined to be the return value.

If the reviver function returns undefined (or returns no value - for example, if execution falls off the end of the function), the property is deleted from the object. Property names must be double-quoted strings trailing commas are forbidden. It is based upon JavaScript syntax, but is distinct from JavaScript: most of JavaScript is not JSON. The reviver is called with the object containing the property being processed as this, and two arguments: key and value, representing the property name as a string (even for arrays) and the property value. JSON is a syntax for serializing objects, arrays, numbers, strings, booleans, and null. Specifically, the computed value and all its properties (in a depth-first fashion, beginning with the most nested properties and proceeding to the original value itself) are individually run through the reviver.

If a reviver is specified, the value computed by parsing is transformed before being returned.