Add Conditional Column to NDJSON Files Online
Add a new column to NDJSON files based on an if/else condition directly in your browser. Set a value for rows that match and a different value for rows that don't — no upload required.
Drop your .ndjson file here
or click to browse — max 50 MB
Frequently Asked Questions
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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