JSONL ⇄ JSON Converter
Convert newline-delimited JSON (JSONL) into a standard JSON array, or back to JSONL. No file size worries — up to 200MB is supported.
Or convert a file directly — supports files up to 200MB
Drag & drop a file here, or click to browse
Processed in the background, so the page stays responsive even for huge files
How to use this tool
JSONL (JSON Lines) stores one JSON object per line and is common in log files, ML training datasets, and streaming exports. Switch to JSONL → JSON to merge those lines into a single JSON array, or JSON → JSONL to split an array back into one object per line. Each line is validated independently, so a bad line number is reported precisely. Runs entirely in your browser.
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