Preparing Data for Fine-Tuning: JSON to JSONL Conversion

If you're getting into fine-tuning Large Language Models (LLMs) like GPT-3.5 or Llama 2, you've likely encountered the JSONL (JSON Lines) format. Unlike standard JSON, which is a single object or array, JSONL consists of one valid JSON object per line.

Why JSONL?

JSONL is preferred for streaming and processing large datasets because:

• Memory Efficiency: You can read the file line-by-line without loading the entire dataset into memory.
• Appendable: You can easily add new records to the end of the file without parsing the whole structure.

Converting with DevToolVault

Most datasets come in standard JSON arrays. To convert them:

1. Open our JSON to JSONL Converter.
2. Paste your JSON array (e.g., [{"prompt": "...", "completion": "..."}, ...]).
3. Click "Convert."
4. Download the resulting .jsonl file ready for upload to OpenAI or other platforms.