May 2017
Intermediate to advanced
294 pages
7h 33m
English
Content preview from Apache Spark 2.x Cookbook
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Loading and saving data using the JSON format
JSON is a lightweight data-interchange format. It is based on a subset of the JavaScript programming language. JSON's popularity is directly related to XML getting unpopular. XML was a great solution to provide a structure to the data in plain text format. With time, XML documents became heavier, and the overhead was not worth it.
JSON solved this problem by providing a structure with minimal overhead. Some people call JSON fat-free XML.
JSON's syntax follows these rules:
- Data is in the form of key-value pairs:
"firstName" : "Bill"
- There are four datatypes in JSON:
- String ("firstName" : "Barack")
- Number ("age" : 56)
- Boolean ("alive": true)
- null ("manager" : null)
- Data is delimited by commas ...
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