Skip to main content

Developer · browser workspace

CSV Schema Generator

Infer a practical JSON Schema from CSV headers and values for APIs, validation, and database imports. Process locally in your browser with HappyCSV.

Preparing your private workspace…
How to use this tool

Quick start

Built for creating a json schema starting point from a representative csv export.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A JSON Schema document describing the CSV rows.

  1. 1Upload a representative CSV.
  2. 2Review string fields and suggested types before adopting a schema.
  3. 3Download and refine the schema for your API or validator.

How to CSV Schema Generator

  1. 1Upload a representative CSV.
  2. 2Review string fields and suggested types before adopting a schema.
  3. 3Download and refine the schema for your API or validator.

Why Use This Tool?

  • ✓Infer a practical JSON Schema from CSV headers and values for APIs, validation, and database imports.
  • ✓A JSON Schema document describing the CSV rows.
  • ✓Files are processed locally in this browser.
  • ✓Keep the source file and review the result before importing it elsewhere.

Frequently Asked Questions

What does this tool support?

A JSON Schema document describing the CSV rows.

What are the processing limits?

Up to 100 MB per CSV, 20 MB per complex document; 250,000 rows, 1,000 columns, 2 million cells, and 128 MB output. Jobs stop after two minutes. Large files may need splitting.

Are my files uploaded?

No. File processing stays in your browser. Files are not automatically saved for the next visit.

Can I process multiple files?

This tool processes one file at a time.