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With the increasing popularity of the services Web, XML has converted practically de facto in the standard for transmission of data. But need transmit through Internet many more bytes of information to realise a task that could carry out with a flow of information much smaller.

Like this they have developed new forms of compression XML and, even, new formats complete XML, such as Binary XML (binary XML). All these solutions work expanding or adding to XML, suiting the appearances of downward compatibility in a subject to take into account. Douglas Crockford, an experienced engineer software, proposed a new format of data built on JavaScript called JSON, JavaScript Object Notation (notation of objects JavaScript).

JSON Is a format of data very light based in a subset of the syntax of JavaScript: literal of matrices and objects. As it uses the syntax JavaScript, the definitions JSON can include inside files JavaScript and access to them without any additional analysis like the necessary with languages based in XML.

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