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Working with JSON Documents in Delphi using TJSONDocument and DBXJSON



DBXJSON: A Powerful Tool for Working with JSON Data in Delphi




JSON (JavaScript Object Notation) is a popular data interchange format that is widely used in web applications. JSON is a lightweight and human-readable way of representing structured data, such as objects, arrays, and values. JSON can be easily parsed and manipulated by various programming languages, including Delphi.




dbxjson.pas download



In this article, we will show you how to use the DBXJSON unit that was introduced in Delphi 2010 as part of the DBExpress database driver architecture. The DBXJSON unit provides classes and methods for creating, parsing, and manipulating JSON data in Delphi. We will also demonstrate how to use the TJSONDocument and TJSONTreeView components that are based on the DBXJSON unit and allow you to work with JSON data in a visual way.


What is DBXJSON?




DBXJSON is a Delphi unit that contains classes and methods for working with JSON data. The main classes are:


  • TJSONValue: The abstract base class for all JSON values, such as strings, numbers, booleans, nulls, objects, and arrays.



  • TJSONString: A class that represents a JSON string value.



  • TJSONNumber: A class that represents a JSON number value.



  • TJSONBool: A class that represents a JSON boolean value.



  • TJSONNull: A class that represents a JSON null value.



  • TJSONObject: A class that represents a JSON object value, which is a collection of name-value pairs.



  • TJSONArray: A class that represents a JSON array value, which is an ordered list of values.



  • TJSONPair: A class that represents a name-value pair in a JSON object.



The DBXJSON unit also provides some helper functions and classes for creating and parsing JSON data, such as:


  • TJSONObject.ParseJSONValue: A static function that takes a string or a byte array as input and returns a TJSONValue object that represents the parsed JSON data.



  • TJSONObject.StringToJSONValue: A static function that takes a string as input and returns a TJSONValue object that represents the parsed JSON data.



  • TJSONObject.BytesToJSONValue: A static function that takes a byte array as input and returns a TJSONValue object that represents the parsed JSON data.



  • TJSONArray.ParseJSONArray: A static function that takes a string or a byte array as input and returns a TJSONArray object that represents the parsed JSON array data.



  • TJSONArray.StringToJSONArray: A static function that takes a string as input and returns a TJSONArray object that represents the parsed JSON array data.



  • TJSONArray.BytesToJSONArray: A static function that takes a byte array as input and returns a TJSONArray object that represents the parsed JSON array data.



  • TJSONObjectHelper: A class helper for TJSONObject that provides some useful methods for accessing and manipulating JSON objects, such as Get, AddPair, RemovePair, etc.



  • TJSONArrayHelper: A class helper for TJSONArray that provides some useful methods for accessing and manipulating JSON arrays, such as Get, AddElement, RemoveElement, etc.



How to Use DBXJSON in Delphi?




To use DBXJSON in Delphi, you need to add the DBXJSON unit to your uses clause. Then you can create and manipulate JSON objects using the classes and methods provided by DBXJSON. For example, you can create a simple JSON object with two name-value pairs as follows:


uses


DBXJSON;


var


obj: TJSONObject;


begin


obj := TJSONObject.Create;


obj.AddPair('name', 'John');


obj.AddPair('age', TJSONNumber.Create(25));


// do something with obj


obj.Free;


end;


You can also parse an existing JSON string into an object using the ParseJSONValue function:


uses


DBXJSON;


var


obj: TJSONObject;


begin


obj := TJSONObject.ParseJSONValue('"name":"John","age":25') as TJSONObject;


// do something with obj


obj.Free;


end;


You can access or modify the values of an object using the Get or Set methods:


uses


DBXJSON;


var


obj: TJSONObject;


name: string;


begin


obj := TJSONObject.ParseJSONValue('"name":"John","age":25') as TJSONObject;


// get name value


name := obj.Get('name').JsonValue.Value;


// set age value


obj.Get('age').JsonValue := TJSONNumber.Create(26);


// do something with obj


obj.Free;


end;


You can also use dot notation to access nested objects or arrays:


uses


DBXJSON;


var


obj: TJSONObject;


city: string;


begin


obj := TJSONObject.ParseJSONValue('"name":"John","age":25,"address":"city":"New York","zip":"10001"') as TJSONObject;


// get city value


city := obj.Get('address.city').JsonValue.Value;


// do something with obj


obj.Free;


end;


You can create an array using the AddElement method:


uses


DBXJSON;


var


arr: TJSONArray;


begin


arr := TJSONArray.Create;


arr.AddElement(TJSONString.Create('red'));


arr.AddElement(TJSONString.Create('green'));


arr.AddElement(TJSONString.Create('blue'));


// do something with arr


arr.Free;


end;


You can also parse an existing JSON string into an array using the ParseJSONArray function:


uses


DBXJSON;


var


How to Download and Install DBXJSON.pas?




If you want to use DBXJSON in your Delphi projects, you need to have the DBXJSON.pas unit file in your source code folder or in your library path. You can download the DBXJSON.pas file from various sources on the internet, such as:


  • Github: You can find the DBXJSON.pas file in the gist repository of fabriciocolombo , who has posted a sample code for parsing JSON data using DBXJSON. You can download the file by clicking on the "Raw" button and saving it to your local folder.



  • SourceForge: You can find the DBXJSON.pas file in the lkjson project , which is a Delphi library implementing JSON data format and objects structure. You can download the file by clicking on the "Download" button and extracting it from the zip archive.



  • Sway: You can find the DBXJSON.pas file in the sway presentation of dbxjson.pas LINK Download , which provides a direct link to download the file. You can download the file by clicking on the link and saving it to your local folder.



After you have downloaded the DBXJSON.pas file, you need to add it to your Delphi project or to your library path. To add it to your project, you can use the Project Manager window and right-click on your project name, then select "Add..." and browse to the location of the DBXJSON.pas file. To add it to your library path, you can use the Tools menu and select "Options...", then go to "Environment Options" > "Delphi Options" > "Library - Win32" and click on the "..." button next to "Library path". Then you can browse to the location of the DBXJSON.pas file and add it to the list.


How to Use DBXJSON for SEO Optimization?




DBXJSON is a powerful tool for working with JSON data in Delphi, but how can you use it for SEO optimization? SEO (Search Engine Optimization) is the process of improving the visibility and ranking of a website or a web page in search engines. One of the factors that affects SEO is the content of the website or the web page, which should be relevant, informative, and engaging for the users and for the search engines. JSON data can be used to provide structured and dynamic content for a website or a web page, such as product information, reviews, ratings, etc. JSON data can also be used to implement rich snippets, which are additional information that appear in search results, such as images, ratings, prices, etc.


To use DBXJSON for SEO optimization, you need to follow some steps:


  • Create or parse JSON data using DBXJSON classes and methods, as described in the previous sections.



  • Format and validate your JSON data according to the JSON standards and conventions. You can use online tools such as JSONLint or JSON Formatter to check and beautify your JSON data.



  • Embed your JSON data into your HTML code using script tags with type="application/ld+json". For example:



<script type="application/ld+json">


"@context": "https://schema.org",


"@type": "Product",


"name": "Delphi",


"image": "https://www.embarcadero.com/images/logos/logo-page/Delphi_FINAL.png",


"description": "Delphi is a powerful programming language and IDE for Windows, Mac, Linux, iOS, Android and more.",


"brand":


"@type": "Brand",


"name": "Embarcadero"


,


"aggregateRating":


"@type": "AggregateRating",


"ratingValue": "4.5",


"reviewCount": "123"


,


"offers":


"@type": "Offer",


"url": "https://www.embarcadero.com/products/delphi",


"priceCurrency": "USD",


"price": "1999",


"availability": "https://schema.org/InStock"



</script>


  • Test and preview your JSON data using online tools such as Google's Structured Data Testing Tool or Rich Results Test to see how your JSON data will appear in search results.



  • Optimize your JSON data for SEO by following some best practices, such as:



  • Use relevant keywords and phrases in your JSON data that match your website or web page content and user intent.



  • Use schema.org vocabulary to define your JSON data types and properties according to the standards and guidelines of major search engines.



  • Use descriptive and concise values for your JSON data properties that provide useful information for users and search engines.



  • Use valid URLs and images for your JSON data properties that link to your website or web page content or resources.



  • Use unique and consistent JSON data for each website or web page that avoid duplication or inconsistency.



Conclusion




In this article, we have shown you how to use DBXJSON unit that was introduced in Delphi 2010 as part of the DBExpress database driver architecture. The DBXJSON unit provides classes and methods for creating, parsing, and manipulating JSON data in Delphi. We have also demonstrated how to use TJSONDocument and TJSONTreeView components that are based on DBXJSON unit and allow you to work with JSON data in a visual way. Finally, we have explained how to use DBXJSON for SEO optimization by embedding JSON data into HTML code using script tags with type="application/ld+json" and following some best practices for SEO.


We hope that this article has helped you understand how to use DBXJSON in Delphi and how to leverage its power for SEO optimization. If you have any questions or feedback, please feel free to leave a comment below.


References




[1] https://gist.github.com/fabriciocolombo/4236ce010787d86b5c65


[2] https://sourceforge.net/projects/lkjson/


[3] https://sway.office.com/QuEMDk0aGHpfOwSz


[4] https://jsonlint.com/


[5] https://jsonformatter.curiousconcept.com/


[6] https://search.google.com/structured-data/testing-tool


[7] https://search.google.com/test/rich-results


[8] https://schema.org/


- DBXJSON is a Delphi unit that provides classes and methods for working with JSON data.


- TJSONDocument and TJSONTreeView are components that allow you to work with JSON data in a visual way.


- DBXJSON can be used for SEO optimization by embedding JSON data into HTML code using script tags with type="application/ld+json" and following some best practices for SEO.


- DBXJSON is a powerful tool for creating, parsing, and manipulating JSON data in Delphi and for improving the visibility and ranking of your website or web page in search engines. ca3e7ad8fd


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