Aggregate NDJSON Files Online

What aggregation functions does the NDJSON aggregate tool support?

SUM, AVG (mean), MIN, MAX, and COUNT. You can apply multiple functions to the same column and group by any number of columns.

Can I group by multiple columns when aggregating a NDJSON file?

Yes. Add multiple group-by columns and the aggregations are computed for each unique combination of values across those columns.

What happens to non-numeric columns when aggregating a NDJSON file?

SUM, AVG, MIN, and MAX apply to numeric columns only. COUNT works on any column type and counts non-null values. Non-aggregated, non-grouped columns must be excluded from the output.

Is my data private?

Yes — completely. Your file is never uploaded to any server. Everything runs locally in your browser using WebAssembly — processing happens entirely inside your tab. Once you close the tab, nothing is retained.

What is the maximum file size?

The free limit is 50 MB. For larger files, performance depends on your device's available memory — most modern machines handle 500 MB to 1 GB comfortably.