json-data-generator

json-data-generator helps you build json data that you need for test data purposes. It has a lot of nice features that you can use to build as much test data as you need.

Maven

Add a dependency to com.github.vincentrussell:json-data-generator.

<dependency>
   <groupId>com.github.vincentrussell</groupId>
   <artifactId>json-data-generator</artifactId>
   <version>1.3</version>
</dependency>

Requirements

• JDK 1.7 or higher
• Apache Maven 3.1.0 or higher

Running it from Java

JsonDataGeneratorImpl parser = new JsonDataGeneratorImpl();
parser.generateTestDataJson(String text, OutputStream outputStream);

or

JsonDataGeneratorImpl parser = new JsonDataGeneratorImpl();
parser.generateTestDataJson(URL classPathResource, OutputStream outputStream);

or

JsonDataGeneratorImpl parser = new JsonDataGeneratorImpl();
parser.generateTestDataJson(File file, OutputStream outputStream);

or

JsonDataGeneratorImpl parser = new JsonDataGeneratorImpl();
parser.generateTestDataJson(InputStream inputStream, OutputStream outputStream);

Running it as a standalone jar

java -jar json-data-generator-1.3-standalone.jar -s source.json -d destination.json

Options

usage: [-s <arg>] [-d
       <arg>] [-f <arg>] [-i] [-t <arg>]
 -s,--sourceFile <arg>        the source file.
 -d,--destinationFile <arg>   the destination file.  Defaults to
                              System.out
 -f,--functionClasses <arg>   additional function classes that are on the
                              classpath and should be loaded
 -i,--interactiveMode         interactive mode
 -t,--timeZone <arg>          default time zone to use when dealing with dates

Example

{
    "id": "{{uuid()}}",
    "name": "A green door",
    "age": {{integer(1,50)}},
    "price": 12.50,
    "tags": ["home", "green"]
}

###Repeats You can repeat sections of json to make repeating json objects.

For instance you can do repeats like this:

[
    '{{repeat(2)}}',
    {
        "id": "{{uuid()}}",
        "name": "Test",
        "attributes": [
            '{{repeat(2)}}',
            {
                "shirt": "{{random("red","yellow","green")}}",
                "pants": "{{random("blue","black","orange")}}"
            }
        ]

    }
]

You can also get a random repeat within a range like this:

'{{repeat(2,9)}}',

##Available functions

You can do a lot of cool functions in your puesdo json that that help you randomize your test data.

random integer in range:

{{integer(min,max)}}

random float in range (with optional format):

{{float(min,max)}}

{{float(min,max,"%.2f")}}

random double in range:

{{double(min,max)}}

random long in range:

{{long(min,max)}}

uuid:

{{uuid()}}

objectId (12 byte hex string):

{{objectId()}}

random boolean:

{{bool()}}

an incrementing index integer

{{index()}

a named incrementing index integer

{{index("index-name")}

an incrementing index integer with a specific starting point

{{index(78)}

an incrementing index integer with a name and a specific starting point

{{index("index-name",78)}

lorem ipsum words:

{{lorem(count,"words")}}

lorem ipsum paragraphs:

{{lorem(count,"paragraphs")}}

random phone number:

{{phone()}}

random gender (male or female):

{{gender()}}

current date date:

{{date()}}

current date with format:

{{date("java-simple-date-format")}}

random date between two dates with format (your input must be in this format dd-MM-yyyy HH:mm:ss):

{{date("begin-date","end-date","java-simple-date-format"}}

random date between two dates with default format (your input must be in this format EEE, d MMM yyyy HH:mm:ss z):

{{date("begin-date","end-date"}}

current timestamp (milliseconds, between the current time and midnight, January 1, 1970 UTC):

{{timestamp()}}

random timestamp (milliseconds since midnight, January 1, 1970 UTC) between two dates with default format (your input must be in this format EEE, d MMM yyyy HH:mm:ss z):

{{timestamp("begin-date","end-date"}}

random country:

{{country()}}

random city:

{{city()}}

random state:

{{state()}}

random company:

{{company()}}

random lastname:

{{lastName()}}

random first name:

{{firstName()}}

random username based on first initial from rnadom first name and lastname lowercased:

{{username()}}

random email:

{{email()}}

random social security number:

{{ssn()}}

random ipv4:

{{ipv4()}}

random ipv6:

{{ipv6()}}

random ipv6 (uppercase):

{{ipv6("upper")}}

random ipv6 (lowercase):

{{ipv6("lower")}}

concat (var arg):

{{concat("A","B","C","D")}}

substring:

{{substring("word",3)}}

{{substring("long word", 1, 6)}}

random item from list:

{{random("red","yellow","green")}}

random string with alphabetic characters (defaults to between 10 and 20 characters):

{{alpha()}}

{{alpha(min,max)}}

{{alpha(length)}}

random string with alpha-numeric characters (defaults to between 10 and 20 characters):

{{alphaNumeric()}}

{{alphaNumeric(min,max)}}

{{alphaNumeric(length)}}

##Nesting functions

jason-data-generator supports nesting functions as well.

For example, if you wanted to create results that looked like dollar amounts you could do something like:

{{concat("$",float(0.90310, 5.3421, "%.2f"))}}

or something like this if you wanted a capitalized F or M:

{{toUpperCase(substring(gender(),0,1))}}

##Creating Custom Functions

You can also create new functions if you create the classes and register the function with the function registry.

-When you create Functions you must annotate the class with the @Function annotation and you must specify one or more names for the function. -Use the @FunctionInvocation annotation to indicate the method that will be executed when the function is called. The arguments of the function must be strings (or a Vararg String argument) and the method must return a string.

package my.package;

import com.github.vincentrussell.json.datagenerator.functions.Function;
import com.github.vincentrussell.json.datagenerator.functions.FunctionInvocation;

import java.util.Random;

@Function(name = "new-function")
public class NewFunction {

    private static final Random RANDOM = new Random();

    @FunctionInvocation
    public String getRandomInteger(String min, String max) {
        return getRandomInteger(Integer.parseInt(min), Integer.parseInt(max));
    }

    private String getRandomInteger(Integer min, Integer max) {
        int randomNumber = RANDOM.nextInt(max - min) + min;
        return Integer.toString(randomNumber);
    }
}

then you can put the jar that you have created on the classpath with the the standalone jar (-f registers one or more classes with the Function Registry):

java -cp json-data-generator-1.3-standalone.jar:yourfunctions.jar com.github.vincentrussell.json.datagenerator.CLIMain -s source.json -d destination.json -f my.package.NewFunction

Change Log

1.4 (2017-02-09)

Improvements:

• Created username function

Change Log

1.3 (2017-02-04)

Improvements:

• Changed index function to be based on a String key not it's level of nesting to reduce complexity
• Changed index function to allow for an integer to start at.

Change Log

1.2 (2016-04-10)

Improvements:

• Standalone interactive mode
• The ability to specify a timezone in standalone mode
• New timestamp function
• New alpha function
• New alphaNumeric function

1.1 (2016-03-20)

Improvements:

• Repeats can be randomized between a range of two integers
• Multiple names can be used in the @Function annotation provide multiple functions in the json mapping to the same name
• Created objectId (12 byte hex string) function

Bugs:

• Floating point numbers can be parsed and used in fuctions
• Repeats can be used with functions surrounded in strings, like '{{lorem(1, "words")}}'