All JSONL tools

Every tool runs in your browser, so your files are never uploaded.

Inspect

• JSONL ViewerOpen JSONL files of any size, jump to any line and search them.
• JSONL ValidatorFind bad lines, with fixes, and check OpenAI and Anthropic formats.

LLM

• Batch Results AnalyzerMatch OpenAI and Anthropic batch results to requests and build a retry file.
• Agent Log ViewerRead Claude Code and Codex session logs as a conversation.

Convert

• JSONL to CSV ConverterFlatten JSONL into a CSV file for spreadsheets.
• CSV to JSONL ConverterTurn CSV rows into JSONL records without mangling IDs.
• JSONL to JSON ConverterWrap JSONL records into a single JSON array.
• JSON to JSONL ConverterTurn a JSON array or pretty-printed objects into JSONL.

Reshape

• JSONL SplitterSplit a file by lines or size, with presets for provider batch limits.
• JSONL MergerCombine several JSONL files into one.