Create and read monday.com mirror columns via the API
domain: developer.monday.com · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create a mirror column with the generic create_column mutation, setting column_type to mirror.
Supply a defaults JSON specifying settings.relation_column (mapping an existing connect-boards column ID to true) and settings.displayed_linked_columns (an array of {board_id, column_ids} identifying which columns from the connected board to mirror).
Read mirrored values via column_values, using the MirrorValue fragment to access display_value and mirrored_items (each with linked_item and mirrored_value).
Do not attempt to update or clear a mirror column's value directly through the API.
Known gotchas
Mirror column values cannot be updated or cleared via the API — they are strictly derived from the connected board's connect-boards column.
A mirror column depends on an existing connect-boards column already being configured on the board (relation_column references it).
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