This extension provides previews for JSON Lines (JSONL) files.
It show content of JSONL file's lines in JSON format.
Features
View JSON Lines:
To open the preview for a specific line, do one of the following:
Right-click a .jsonl file in the explorer, choose Open JSON Lines Preview. This will open the line currently selected or the first line.
Open a .jsonl file, place your cursor on the desired line, and run the command JSONL: Open JSON Lines Preview from the command palette (Cmd/Ctrl+Shift+P).
Open a .jsonl file, place your cursor on the desired line, and click the Open JSON Lines Preview icon ($(json)) in the editor title bar.
Edit JSON Lines:
Opening the preview now creates a temporary, editable .json file containing the formatted content of the selected line.
You can modify the content directly in this temporary file.
Save the temporary file (Cmd+S / Ctrl+S). The extension will:
Validate if the content is valid JSON.
Format the JSON back into a single line.
Write the single-line JSON back to the original .jsonl file at the correct line number.
Navigate Between Lines (in Edit View):
When viewing the temporary edit file, navigation buttons appear in the editor title bar:
JSONL Previous Line ($(arrow-up))
JSONL Next Line ($(arrow-down))
JSONL Go to Line ($(selection))
Clicking these buttons (or running the corresponding commands) will close the current temporary file and open a new one for the target line.
Automatic Cleanup:
Temporary edit files are automatically deleted when their editor tab is closed.
The temporary directory is cleaned up on VS Code startup/reload to remove any orphaned files from previous sessions.
Release Notes
0.1.0 (2025-04-20)
Added Line Editing: You can now edit individual lines via a temporary JSON file. Saving the temp file updates the original .jsonl file.
Added Automatic Cleanup: Temporary files are cleaned up when closed or on startup.
Added Contextual Navigation: Previous/Next/Go To Line buttons now only appear in the edit view.
Fixed Multi-Window Safety: Startup cleanup no longer interferes with other VS Code windows.
