API overview

Reference	For
@lettrove/embed	Opening the editor in a page: createEditor, every option, method and event
@lettrove/react	The <LettroveEditor /> React component
@lettrove/vue	The same component for Vue 3
@lettrove/node	Your server: tokens, designs, exports, rendering, erasure, webhook verification
REST API	The same server calls over HTTPS, from any language. Also an OpenAPI 3.1 document
Webhook events	What Lettrove sends your server
Error codes	Every code, what it means, what to do
The design document	What you may rely on in a stored design
Glossary	One word for each idea

Conventions

• Base address: https://api.lettrove.com. Server routes are under /embed/v1/.
• Authentication: your secret key, as Authorization: Bearer lt_sk_test_… or lt_sk_live_…. Only from your server.
• JSON in and out, UTF-8. Request bodies are strict: an unknown field is refused, naming it.
• Ids are strings. Design ids are 26-character ids such as 01J9ZQ3W8D2K7M5T1V4XG6HB0R; your own ids for people are whatever you chose, up to 256 characters.
• Times are ISO 8601 in UTC: 2026-10-07T16:03:10.000Z.
• Lists come newest first, a page at a time: { "items…": […], "nextCursor": "…" }; pass cursor for the next page; nextCursor is null on the last.
• Errors: { "error": "…", "code": "…", "requestId": "…" } with an HTTP status; quote requestId to support.
• Rate limits per key, per minute; over one, 429 with Retry-After in seconds. See Limits.
• Versioning: within 1.x, fields are only ever added. Ignore fields you do not know. Anything added after 1.0 says Added in 1.y.