Count Values in JSON Files Online
Group and count rows by any column in JSON files directly in your browser. Sort by frequency or value to find the most common entries — no upload required.
About this tool
Group and count rows in a JSON file by any column. See how many rows share each unique value — sorted by frequency. A fast way to understand the distribution of categorical data.
Frequently Asked Questions
What does the count-by tool do with a JSON file?
It groups rows by the unique values in a chosen column and counts how many rows fall into each group — equivalent to SELECT col, COUNT(*) FROM table GROUP BY col ORDER BY count DESC.
Can I count by multiple columns in a JSON file?
This tool counts by one column at a time. For multi-column grouping use the SQL Query tool or the Aggregate tool, which supports GROUP BY on multiple columns.
How are results sorted in the JSON count-by output?
Results are sorted by count descending by default, so the most frequent values appear first. You can re-sort the output using the Sort tool.
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.
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