Blueprint Runner: a self-hosted engine that speaks Make natively

The engine reads Make blueprint JSON directly and implements the module set: HTTP with raw and urlencoded bodies, headers, query strings and error handling; the Airtable actions including search, create, update, upsert and arbitrary REST calls; and flow control across iterators, routers, if/else with merge, and merge filters. Unknown app modules are skipped with a log entry and emit an empty bundle, so a partially supported blueprint still runs end to end instead of halting.

Module references with backticked keys and array mapping, one-based indexing, and the function library: date formatting and arithmetic, conditionals, string and array operations, hashing, encoding, plus Make's filter operators and its OR-of-AND-groups condition matrix. This is the part that makes a blueprint portable rather than merely readable.

Tokens live in variables referenced as double-brace var names, and connections map Make's numeric connection identifiers to credentials. A scan-and-extract action finds bearer tokens and API keys hardcoded in a pasted blueprint, moves them into variables, and rewrites the JSON to reference them, so the blueprint becomes safe to commit. Server-side environment variables can supply the same values, with anything entered in the interface overriding them.

The default view renders the blueprint as wired module nodes with routers and branches fanning out, curved connectors, branch labels and filter badges. Clicking a node opens a type-aware inspector; a plus between modules opens a grouped picker. The canvas and the raw JSON are two views of the same data, so anything built visually exports as a Make-compatible blueprint.

The self-test mocks a clinic API and Airtable and asserts a genuine end-to-end scenario: new-patient creation, visit deduplication through a merge filter, record creation, linked-record append using the string-surgery idiom this actually requires in practice, a filtered route on primary diagnosis, and cross-bundle text aggregation.