---
title: Croissant Converter
emoji: 🥐
colorFrom: blue
colorTo: green
sdk: gradio
sdk_version: 5.44.1
app_file: app.py
pinned: false
license: mit
short_description: '"Croissant" is a trademark of MLCommons.'
---

# 🥐 Croissant JSON-LD ↔ TOML Converter

A bi-directional converter for transforming [Croissant](https://github.com/mlcommons/croissant) metadata between JSON-LD and human-readable TOML formats.

## Features

- ✅ **Bi-directional conversion**: JSON-LD ↔ TOML
- ✅ **File upload support**: Process up to 5 files at once
- ✅ **Copy-paste interface**: Instant conversion for text content
- ✅ **Auto-format detection**: Automatically detects input format
- ✅ **Batch processing**: ZIP download for multiple files
- ✅ **Error handling**: Robust validation and error reporting
- ✅ **Examples included**: Sample content for both formats

## Usage

### File Upload
1. Select up to 5 Croissant files (.json, .jsonld, .toml)
2. Click "Convert Files" to process all uploads
3. Download individual files or ZIP package
4. Original filenames are preserved with new extensions

### Copy-Paste
1. Paste your Croissant content in the input area
2. Choose conversion direction or use auto-detect
3. Copy the converted content from the output

## Supported Formats

- **JSON-LD**: Croissant metadata with @context and schema.org vocabulary
- **TOML**: Human-readable format with comments and logical structure

## About Croissant

Croissant is a metadata format for ML datasets developed by MLCommons. It provides a standardized way to describe dataset structure, fields, and distributions.

"Croissant" is a trademark of MLCommons. This converter tool is not affiliated with or endorsed by MLCommons.

## Technical Details

- Uses proper TOML Array of Tables syntax (`[[record_sets]]`)
- Preserves complex nested objects during conversion
- Handles schema.org and Croissant namespaces correctly
- Maintains data integrity through round-trip conversions

## Links

- [Croissant GitHub](https://github.com/mlcommons/croissant)
- [MLCommons Croissant](https://mlcommons.org/croissant/)
- [TOML Specification](https://toml.io/)

Built with ❤️ using Gradio