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Builds a string-keyed map from per-key mapping specs and writes it into an assign. Use it when a downstream node or step needs a plain map (e.g. a Flow Action’s *_options_assign) rather than a typed struct. Each row is one key in the resulting map. Pick where each key’s value comes from — another assign, a path into a struct, a dated property, or a literal.

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Configuration

  • Output assign (required for execution) — name of the flow-token assign that receives the built map.
  • Nested path (optional) — write into a nested location inside the target assign (put_in-style). Leave empty for a plain top-level write.
  • Mappings — one row per output key. The key name is free-form; the value uses the same vocabulary as Flow Compose / Flow Assign.

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What’s the difference vs. Flow Compose?

Flow Compose builds a typed struct from a declared target_shape; the inspector enumerates the struct’s fields for you. Flow Map Build is the free-form cousin — no shape, no field enumeration, just whatever string keys you type.

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Ports