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Author: Yann Spöri
07. December 2020

Comment utiliser JSON

Especially when testing websites, you are now and then faced with the problem of having to parse JSON (=JavaScript Object Notation) strings.

Often, for this, a JSON library is downloaded and placed into the corresponding plugin directory. After a restart it is then possible to e.g. use the Python JSON library in Jython scripts.

In this blog article, however, the JSON library provided by QF-Test should be described. This library is based on the minimal-json-library and has the advantage that:

  • it is already supplied with QF-Test (so not a plugin first must be installed)
  • It is available in both Jython and Groovy scripts

The following chapters describe how this library can be used for JSON parsing and JSON generation.

JSON parsing

The general code to parse a JSON string using this library looks like this:

 

from de.qfs.lib.json import Json
jsonStr = """{"a" : 1, "b" : "zzz", "c" : [1,2,3]}"""
json = Json.parse(jsonStr)

 

(Jython Code to parse a Jython String)

 

import de.qfs.lib.json.Json
def jsonStr = """{"a" : 1, "b" : "zzz", "c" : [1,2,3]}"""
def json = Json.parse(jsonStr)

 

(Groovy Code to parse a Jython String)

Afterwards, you can easily access the different values defined in the JSON string:

 

qf.println(json["a"])           # Output: 1
qf.println(json["b"])           # Output: zzz
qf.println(json["c"])           # Output: [1,2,3]
qf.println(json["c"][0])        # Output: 1
qf.println(json["c"][1])        # Output: 2
qf.println(json["c"][2])        # Output: 3

 

(Jython Code in order to access the various values / output them on the terminal)

 

qf.println(json["a"])           // Output: 1
qf.println(json["b"])           // Output: zzz
qf.println(json["c"])           // Output: [1,2,3]
qf.println(json["c"][0])        // Output: 1
qf.println(json["c"][1])        // Output: 2
qf.println(json["c"][2])        // Output: 3

 

(Groovy Code in order to access the various values / output them on the terminal)

In Groovy, the following notation is also possible for JSON Maps:

qf.println(json.a) // Output: 1

(Groovy Code in order to access the various values / output them on the terminal)

which makes it possible to "save" further characters in the script. In this context let me also point to Groovy's ?-Notation which is helpful when a certain value can be present in the JSON string but does not have to be present.

Generating JSON

The general code to generate a JSON string using this library looks like this:

 

from de.qfs.lib.json import JsonBuilder
obj = { "a" : [1,2,3,4] }
jsonStr = JsonBuilder.toJsonValue(obj)

(Jython code to generate a JSON string from an object)

 

import de.qfs.lib.json.JsonBuilder
def obj = [ "a" : [1,2,3,4] ]
def jsonStr = JsonBuilder.toJsonValue(obj)

(Groovy code to generate a JSON string from an object)
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