Principle:ClickHouse ClickHouse Poco JSON Templating
| Knowledge Sources | |
|---|---|
| Domains | JSON, Templating |
| Last Updated | 2026-02-08 00:00 GMT |
Overview
Separating data from presentation through template-based content generation with embedded control structures.
Description
JSON templating is a design pattern that separates data (structured JSON) from presentation logic (template markup). Instead of mixing data access and formatting code, templates contain static content interspersed with directives for dynamic content insertion, conditional rendering, and iteration over data structures.
This principle enables non-programmers to modify presentation without touching application code, promotes reusability of templates across different data sources, and simplifies maintenance by clearly separating concerns. Templates act as views in MVC architecture, with JSON data as the model.
Usage
Use JSON templating when generating reports, emails, web pages, or any text-based output where the structure is relatively fixed but content varies based on data. It's particularly valuable when non-developers need to modify formatting or when the same data needs multiple presentation formats.
Theoretical Basis
The templating principle builds on:
- Separation of Concerns: Isolating data, logic, and presentation into distinct layers
- Template Method Pattern: Defining structure with placeholders filled by specific implementations
- Domain-Specific Languages: Creating specialized syntax optimized for a particular task (content generation)
- Declarative Programming: Describing what should be rendered rather than how to render it
Template languages provide higher-level abstractions than general-purpose programming languages, making them more accessible for presentation-focused tasks while preventing business logic from creeping into views.