- Enter the JSONL Fine-tune Validator input in the field on the page.
- Click "Validate" to run the tool in your browser.
- Read the result below the form and copy it if you need it in another app.
JSONL Fine-tune Validator
Validate JSONL files for LLM fine-tuning.
How to Use This Tool
Learn More About JSONL Fine-tune Validator
About JSONL Fine-tune Validator
Validate JSONL files for LLM fine-tuning. Checks JSON syntax, required fields, and token counts.
About
Validate JSONL files for LLM fine-tuning. Checks JSON syntax, required fields, and token counts.
Validate JSONL files for LLM fine-tuning. Checks JSON syntax, required fields, and token counts.
- Runs in browser
- Yes
- No signup required
- Yes
Examples
Example usage
Try the tool with sample input.
Input
{
"messages": [
{
"role": "system",
"content": "You are helpful."
},
{
"role": "user",
"content": "Hi"
},
{
"role": "assistant",
"content": "Hello!"
}
]
}Output
Line 1: ✓ 3 messages, 7 tokens Summary: 1 valid, 0 invalid, 7 total tokens
Use Cases
- Check jsonl fine-tune validator values while you draft a page, spreadsheet, or config.
- Paste a sample into JSONL Fine-tune Validator and copy the output into your workflow.
- Keep sensitive inputs on-device — this page runs the calculation in the browser.
Frequently Asked Questions
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