JSON Arrays to Table: Rendering Records as Rows and Columns
Turn a JSON array of objects into a tabular format. Handle mixed schemas, missing keys, and arrays-of-arrays for spreadsheet compatibility.
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Tags: data, json, tables
JSON Arrays to Table: Rendering Records as Rows and Columns A JSON array of objects is already conceptually a table — each object is a row, each key is a column. The challenge is making it actually look like one, handling the cases where records disagree on keys, and deciding what to show when a value is missing. This post covers column inference, missing key handling, ordering strategies, and HTML table output. -|------|------| | 1 | Alice | admin | | 2 | Bob | editor | The algorithm is: Extract all unique keys → column headers. For each record, write one row with values in column order. Use empty string or for missing keys. Simple. The problems start when records are not this clean. --- Step 1: Column Inference The obvious approach — use — breaks when the first record is not…
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