JSON (JavaScript Object Notation) is a lightweight data format used to represent structured information using key-value pairs and arrays. It is designed to be easy for humans to read and write, and easy for software to parse and generate. JSON is one of the most common formats for exchanging data between web applications, services, and client-side UI components.
Where You Will See JSON in Email Products
In email tooling, JSON often sits behind the UI. A visual editor may store template structure as JSON (for example, a tree of blocks, rows, and settings) and then generate HTML output from that structure. You will also see JSON used in API requests and responses, especially when working with an email API or an editor API. If your product triggers events when a user saves or publishes a template, those event payloads are commonly sent as JSON through webhooks or callbacks.
JSON for Configuration and Reusable Components
JSON is a practical choice for configuration because it is explicit and portable. Products frequently represent editor settings, themes, and feature toggles as JSON so they can be versioned and applied consistently across environments. For example, a theme object may define typography, spacing, and colors similar to a theme configuration. A block library may be described as JSON so the editor can render and validate custom blocks without hardcoding every option.
Common Pitfalls and Best Practices
JSON is strict. Keys must be quoted, trailing commas are not allowed, and only specific types are permitted (strings, numbers, booleans, null, arrays, objects). Agree on a schema early so different parts of your system interpret data the same way. Validate inputs at the boundary, especially for public endpoints like a public API. Keep payloads stable over time by versioning fields, documenting deprecations, and avoiding breaking changes to object shapes.
Responsive Email and Topol
Topol Plugin commonly uses JSON-shaped data for configuration, events, and integration workflows, so SaaS teams can embed email editing and connect it cleanly to their backend systems. Exporting templates from our editor in JSON format can be done in just a few clicks. Learn more at Topol, create an account at Topol signup, or explore the Topol glossary.