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Working with JSON

50m 49s

Intermediate

JSON stands for JavaScript Object Notation. It is a lightweight data-interchange format that is a textual representation of data that is usually in memory. It is native to JavaScript and should be recognizable to C-style programmers. It is very human-readable, and machines can easily parse and generate it. This course shows how to work with JSON in DataFlex.

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Introduction to the Course.

JSON means JavaScript Ojbect Notation. It's a lightweight data-interchange format; a textual representation of data that usually would be in the memory. This lesson introduces JSON.

When parsing and generating JSON in DataFlex a cJsonObject is used. The cJSON Object can parse and generate JSON and it can be accessed like a DOM structure. This lesson shows how to parse JSON.

Generating JSON

This lesson shows how to generate JSON by dynamically creating the JSON Objects and calling stringify to get the JSON String.

Parsing JSON into structs

When working with data in memory in DataFlex it's common to use structs and arrays to organise the data. structs have a matching structure with JSON. That's why it makes sense to convert JSON into structs and arrays when working with them in DataFlex. This lesson shows how to parse JSON into structs.

Working with the JSON DOM

When creating JSON Objects or parsing JSON, a Document Object Module (DOM) is in memory. This can be stringifyed or put into a struct. This example shows how to work with the JSON DOM.

Handling large UTF 8 strings

The previous lesson showed how to use strings to represent JSON in memory as a text format. Strings in DatFlex have certain limitations: limited length, OIM and it doesn't support special characters. UTF-8 is a common encoding type for using JSON on the web. This lesson shows how to work with UTF-8 strings.

The previous lessons showed how to use JSON in DataFlex using the cJsonObject. There are two other ways to use JSON in DataFlex: Calling JSON REST services and using JSON within the regular DataFlex WebServices. This lesson explains both options shortly.

Course instructor

Harm Wibier

Software Engineer , Data Access Europe B.V.

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