Download and install the latest version of Filestar.
Right click on one or more Jsonl file(s) on your desktop and select Convert with Filestar.
Type convert to feather in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.jsonl -c "convert to feather" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.jsonlContract.jsonl
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
ConvertMergeCompressExtractMoveZip
Let your AI agent convert JSONL to FEATHER
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the JSONL files in my Downloads folder to FEATHER”
Or run it yourself:
filestarcli -i file.jsonl -c "convert to feather"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert JSONL to FEATHER?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.jsonl -c "convert to feather" on your computer, so your files stay on it.
A JSON Lines file holds one JSON value per line, usually one record per line, so it can be written and read as a stream. Logs, data exports and machine learning datasets use it.
A Feather file is a data table written by pandas, R or pyarrow; Feather version 2 is the Apache Arrow IPC file format, usually with LZ4 or ZSTD compression.
