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

I built this GPT JSONL Editor because I needed one for my own GPT fine-tuning work and couldn't find a decent option on the market. The problem: OpenAI's fine-tuning format is strict: each training example needs a "messages" array with proper role/content structure. Generic JSONL editors don't validate this. Text editors don't help you visualize conversations. I was manually editing JSON and catching validation errors only after uploading to the API. **What makes this different:** • Visual editor that understands the GPT conversation format • Real-time validation (catches missing fields, invalid roles, empty content) • Insert/edit/delete records with immediate feedback • Works entirely in your browser (your training data never leaves your machine) • Handles datasets from 10 to 10,000+ examples with pagination Who it's for: ML engineers preparing ChatGPT fine-tuning data, data scientists structuring conversational AI datasets, developers building GPT-powered applications. Built because: I needed it, couldn't find it, so I made it. Simple as that. Try it yourself: https://www.jsonlify.com/jsonl-e... Would love your feedback: • What other validation rules would be helpful? • What formats would you like to import from (CSV, Excel, etc.)? • What's your biggest pain point with GPT fine-tuning data prep? Thanks for checking it out!