# Preview: JSON Support in MailMerge Version X14 (24.0) > MailMerge X14 (24.0) adds a Merge method overload that accepts JSON strings as a data source alongside DataTable and DataSet inputs. JSON data supports nested objects for relational structures and Base64-encoded images. Web.TextControl also gains JSON merge field population. - **Author:** Bjoern Meyer - **Published:** 2016-05-18 - **Modified:** 2026-07-17 - **Description:** MailMerge X14 (24.0) adds a Merge method overload that accepts JSON strings as a data source alongside DataTable and DataSet inputs. JSON data supports nested objects for relational structures and Base64-encoded images. Web.TextControl also gains JSON merge field population. - **2 min read** (225 words) - **Tags:** - JSON - Mail Merge - Release - Reporting - **Web URL:** https://www.textcontrol.com/blog/2016/05/18/preview-json-support-in-mailmerge-version-x14-240/ - **LLMs URL:** https://www.textcontrol.com/blog/2016/05/18/preview-json-support-in-mailmerge-version-x14-240/llms.txt - **LLMs-Full URL:** https://www.textcontrol.com/blog/2016/05/18/preview-json-support-in-mailmerge-version-x14-240/llms-full.txt --- JSON, the acronym for *JavaScript Object Notation*, is a data format used in modern, web-based applications. It became the de facto standard format to transfer data in web-based applications. In the current version of [MailMerge](https://docs.textcontrol.com/textcontrol/windows-forms/ref.txtextcontrol.documentserver.mailmerge.class.htm), the [Merge](https://docs.textcontrol.com/textcontrol/windows-forms/ref.txtextcontrol.documentserver.mailmerge.merge.method.htm) method accepts a *DataTable* and a *DataSet*. The [MergeObject](https://docs.textcontrol.com/textcontrol/windows-forms/ref.txtextcontrol.documentserver.mailmerge.mergeobject.method.htm) and [MergeObjects](https://docs.textcontrol.com/textcontrol/windows-forms/ref.txtextcontrol.documentserver.mailmerge.mergeobject.method.htm) methods merge an object or collections of objects into a loaded template. In version X14 (no release date known yet), the *MailMerge* class accepts a JSON object as the data source: ``` void MailMerge.MergeJsonData(string json, bool append) ``` The JSON strings should contain an array of objects, very similar to XML files serialized from a DataSet. Relations are built based on nested objects in the hierarchy of the JSON string. The JSON object can contain strings, integers and even images encoded as Base64 strings. According to this new data source type support, the HTML5 based editor [Web.TextControl](https://docs.textcontrol.com/textcontrol/asp-dotnet/ref.txtextcontrol.web.textcontrol.class.htm) will also accept a JSON string to fill the merge field drop-downs. Stay tuned for more! --- ## About Bjoern Meyer As CEO, Bjoern is the visionary behind our strategic direction and business development, bridging the gap between our customers and engineering teams. His deep passion for coding and web technologies drives the creation of innovative products. If you're at a tech conference, be sure to stop by our booth - you'll most likely meet Bjoern in person. With an advanced graduate degree (Dipl. Inf.) in Computer Science, specializing in AI, from the University of Bremen, Bjoern brings significant expertise to his role. In his spare time, Bjoern enjoys running, paragliding, mountain biking, and playing the piano. - [LinkedIn](https://www.linkedin.com/in/bjoernmeyer/) - [X](https://x.com/txbjoern) - [GitHub](https://github.com/bjoerntx) --- ## Related Posts - [MailMerge: Conditional Rendering of Merge Blocks](https://www.textcontrol.com/blog/2018/11/28/mailmerge-conditional-rendering-of-merge-blocks/llms.txt) - [DataSourceManager: Using the Ready-to-Use Reporting Dialog Boxes](https://www.textcontrol.com/blog/2018/11/27/datasourcemanager-using-the-ready-to-use-reporting-dialog-boxes/llms.txt) - [Merge Blocks in X16: Filtering, Sorting and Conditional Rendering](https://www.textcontrol.com/blog/2018/11/22/merge-blocks-in-x16-filtering-sorting-and-conditional-rendering/llms.txt) - [MailMerge Improvements in X14: Event Arguments and JSON Data Sources](https://www.textcontrol.com/blog/2016/11/01/mailmerge-improvements-in-x14-event-arguments-and-json-data-sources/llms.txt) - [TX Text Control 32.0 Has Been Released](https://www.textcontrol.com/blog/2023/09/13/tx-text-control-320-has-been-released/llms.txt) - [TX Text Control 31.0 and TX Spell .NET 10.0 Have Been Released](https://www.textcontrol.com/blog/2022/09/07/tx-text-control-31-released/llms.txt) - [TX Text Control 30.0 and TX Spell .NET 9.0 Have Been Released](https://www.textcontrol.com/blog/2021/11/29/tx-text-control-30-released/llms.txt) - [TX Text Control X19 and TX Spell 8.0 Have Been Released](https://www.textcontrol.com/blog/2020/12/02/tx-text-control-x19-released/llms.txt) - [TX Text Control for Angular X18 Published](https://www.textcontrol.com/blog/2020/03/18/tx-text-control-for-angular-x18-published/llms.txt) - [MVC NuGet Packages for X18 Published](https://www.textcontrol.com/blog/2020/03/17/mvc-nuget-packages-for-x18-published/llms.txt) - [TX Text Control X18 has been Released](https://www.textcontrol.com/blog/2020/03/16/tx-text-control-x18-released/llms.txt) - [Sneak Peek X18: Form Field Conditional Instructions](https://www.textcontrol.com/blog/2020/01/03/sneak-peek-x18-form-field-conditional-instructions/llms.txt) - [DocumentViewer: New Two Page View Mode](https://www.textcontrol.com/blog/2020/01/02/documentviewer-new-two-page-view-mode/llms.txt) - [MailMerge Class Settings Explained](https://www.textcontrol.com/blog/2019/12/05/mailmerge-settings-explained/llms.txt) - [See Text Control at DDC in Cologne](https://www.textcontrol.com/blog/2019/11/24/see-text-control-at-ddc-in-cologne/llms.txt) - [Impressions from DEVintersection Fall 2019](https://www.textcontrol.com/blog/2019/11/22/impressions-from-devintersection-fall-2019/llms.txt) - [Impressions from TechBash 2019](https://www.textcontrol.com/blog/2019/11/14/impressions-from-techbash-2019/llms.txt) - [Merge Excel Documents into MailMerge Templates using IncludeText Fields](https://www.textcontrol.com/blog/2019/08/13/merge-excel-documents-into-mailmerge-templates/llms.txt) - [MailMerge: Conditional Table Cell Colors using Filter Instructions](https://www.textcontrol.com/blog/2019/06/06/mailmerge-conditional-table-cell-colors-using-filter-instructions/llms.txt) - [MailMerge: Using Filters to Remove Unwanted Rows](https://www.textcontrol.com/blog/2019/06/04/mailmerge-using-filters-to-remove-unwanted-rows/llms.txt) - [TX Text Control X17 has been Released](https://www.textcontrol.com/blog/2019/05/28/tx-text-control-x17-released/llms.txt) - [Text Control Roadmap 2019: High DPI Support, Forms, Node.js and Angular](https://www.textcontrol.com/blog/2019/03/12/text-control-roadmap-2019/llms.txt) - [Impressions from BASTA! 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