Convert NDJSON to CSV Online

NDJSON (Newline-Delimited JSON) is the standard format for log data, event streams, and incremental database exports — but it is not directly usable in spreadsheets, SQL databases, or most analytics tools without conversion. Converting NDJSON to CSV flattens your records into a tabular format that works everywhere, making it the essential first step for analysing log data, streaming exports, or event archives.

Common use cases include converting server access logs for analysis in Excel or a database, transforming a bulk Elasticsearch export into CSV for reporting, processing event stream snapshots, loading incremental database change-data-capture exports into a staging table, and converting application log files emitted by frameworks like Pino, Bunyan, or Loguru.

If your NDJSON records contain nested objects, this tool serialises those nested fields as JSON strings in the CSV output. For a cleaner flat table, run the resulting CSV through the Flatten tool to expand nested keys into their own columns using dot notation. All NDJSON records should share the same top-level key structure for the column schema to be consistent across rows.