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A Join Markt theme is a folder of plain files. JSON files hold what the seller changes in the visual editor (pages, header, footer, theme settings). Code files hold the design of each section. The builder edits these files, the preview builds them, and Publish ships the same files to your live store.
Dark visual builder with sections, preview, and settings

Visual builder

Dark code builder with the file tree, editor, and preview

Code builder

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How it fits together

1

Pick a theme

Start from a catalog theme in the builder. The theme is copied into your store, so every file is yours to change.
2

Edit

Use Visual to add, reorder and configure sections, or Code to change any file. Both editors write the same files.
3

Preview

The preview is a real build of your theme on your store data, not a screenshot. It updates as you edit.
4

Publish

Publish builds the theme and puts it live on your subdomain and custom domain.

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One pipeline, three ways to write a section

theme.json sets runtime to react, liquid, or vite. That only changes how a section’s design file is written. Settings, blocks, the visual editor, preview and publish work the same for all three.

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In this section

The catalog lists every theme the hub can install.

Theme catalog

Name, runtime, tone, and price for every theme you can start from.

Create a custom theme

Copy a catalog theme or import a ZIP, then edit and publish.

Theme structure

The files in a theme and what each one does.

Runtimes

The same section written in React, Liquid and Vite.

Section schema

Every setting type, presets, limits and templates.

Blocks and nesting

Repeatable items and one-level nested blocks.

Pages

Built-in templates and custom pages.

Using the builder

Visual and Code editing.

Publish and updates

Publishing, warnings and theme updates.

Troubleshooting

Changes not showing, JSON errors, platform files.