JSONL(JSON Lines) Editor for OpenAI – Visual editor for GPT fine-tuning datasets

Summary: A browser-based JSONL editor tailored for GPT fine-tuning that enables creation, validation, and management of AI training datasets with real-time error checking and secure local storage. It exports data compatible with OpenAI’s fine-tuning format and supports large datasets with pagination.

What it does

It provides a visual interface that enforces OpenAI’s strict "messages" array format for training examples, validating roles and content in real time. Users can insert, edit, and delete records while working entirely in the browser without uploading data externally.

Who it's for

Machine learning engineers, data scientists, and developers preparing or structuring conversational AI datasets for GPT fine-tuning.

Why it matters

It solves the problem of manual JSON editing and delayed validation by catching format errors immediately, streamlining dataset preparation for GPT fine-tuning.