Nested JSON to CSV Handling: Strategies for Arrays Within Objects
Handle nested arrays and objects when converting JSON to CSV. Compare row explosion vs. serialized columns vs. multiple output sheets.
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Tags: data, json, csv
Nested JSON to CSV Handling: Strategies for Arrays Within Objects The array-within-object problem is where most JSON-to-CSV converters either make a silent wrong choice or crash. Given a record with a nested array, you have fundamentally incompatible representations: one CSV row per record, or one CSV row per array element. Neither is universally correct. This post examines the core challenge, the two main strategies, multiple arrays at different depths, and when to use each approach. Strategy 1: Join Array as String The simplest approach. Serialize the array into a single cell value. For primitive arrays (tags, labels, IDs) This works well when: The array contains simple strings or numbers. Downstream tools will split the cell on a known delimiter. The number of elements is small and…
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