How do I convert NFT metadata to CSV?

Simply upload your folder of JSON files or select multiple JSON files. The tool will automatically parse them, flatten the attributes, and generate a CSV for download.

Does this tool support OpenSea metadata standard?

Yes, it specifically detects the 'attributes' or 'traits' array used in ERC-721/ERC-1155 metadata and converts them into individual columns.

Absolutely. This tool runs entirely in your browser (client-side). No files are ever uploaded to a server.

NFT Metadata to CSV Converter

Convert thousands of NFT JSON files into a clean CSV instantly. Automatically flattens attributes for OpenSea compatibility.

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Drag & Drop JSON files here

or click to select files (Select multiple files or a folder)

Files: 0

Attributes Found: 0

Data Preview (First 10 rows)

About NFT Metadata to CSV Converter

Managing NFT collections often involves handling thousands of individual JSON files. Whether you are an artist, developer, or collector, analyzing this data one by one is impossible. Our NFT Metadata to CSV Converter is a specialized tool designed to merge and convert these JSON files into a single, easy-to-read CSV spreadsheet.

Unlike generic JSON converters, this tool is context-aware. It understands the standard ERC-721 and ERC-1155 metadata structure used by marketplaces like OpenSea. It automatically detects the attributes or traits array and "flattens" them, turning each trait type (e.g., "Background", "Eyes") into its own column.

How to Use

Select Files: Click the "Select Files" button. You can select thousands of individual JSON files at once, or select an entire folder containing your metadata.
Automatic Processing: The tool runs entirely in your browser. It reads each file, extracts the standard fields (Name, Description, Image, etc.), and intelligently maps the attributes.
Preview Data: Once processed, a preview table appears showing the first few rows of your data. You can verify that the attributes have been correctly split into columns.
Download CSV: Click "Download CSV" to get your complete dataset formatted and ready for Excel, Google Sheets, or data analysis tools.

Why Use This Tool?

Smart Attribute Flattening: Automatically converts nested {"trait_type": "Color", "value": "Blue"} structures into a "Color" column with the value "Blue".
Privacy First: This is a client-side tool. Your metadata files are processed locally on your device and are never uploaded to any server.
Bulk Processing: Optimized to handle large collections (10k+ items) without crashing your browser.
No Dependencies: No need to install Python scripts or Node.js packages. It just works in your browser.

Frequently Asked Questions

What metadata standards are supported?

We support the standard OpenSea metadata format (ERC-721/ERC-1155), which typically includes fields like name, description, image, and an attributes array.

Is there a limit to how many files I can upload?

The tool is tested with collections up to 10,000 items. Performance depends on your computer's RAM since processing happens locally.

Can I open the CSV in Excel?

Yes, the generated CSV is standard comma-separated values format, compatible with Microsoft Excel, Google Sheets, Apple Numbers, and more.

Does it handle missing attributes?

Yes. If some NFTs in your collection don't have a specific trait (e.g., only some have "Hat"), the cell for that column will simply be left empty for those that don't.

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