Email Builder JS

Waypoint-style JSON Document Editor

Blocks

Click to add to email

Select a block to edit properties

JSON

HTML

From

Must be a verified sending domain in SparkPost

To (recipients)

Comma-separated email addresses

Subject

Content

HTML will be generated from your current email design

Checking configuration...

Secure API Key Storage

Your SparkPost API key is stored as an encrypted Cloudflare secret — it is never exposed to the browser or stored in code.

To configure or update your API key, run:

npx wrangler pages secret put SPARKPOST_API_KEY --project-name=email-editor

Optional — set a default from address:

npx wrangler pages secret put DEFAULT_FROM_ADDRESS --project-name=email-editor

Default From Address

Saved locally. Overridden by server-side DEFAULT_FROM_ADDRESS secret if set.

Default Subject Prefix

Canvas Color

Backdrop Color

Paste your HTML email template below. The editor will parse it into blocks.