Auto Schema Detector

What is Auto Schema Detector?

Auto Schema Detector is a free, browser-based tool that helps you produce ready-to-use output in seconds. Infer a schema (types, nullability, uniqueness) from any sample dataset. It's built for speed and privacy: Everything runs locally in your browser — your data is never uploaded to a server. No sign-up, no installs, and no daily limits.

Used by

• Data engineers
• Database administrators
• Analytics engineers
• API developers
• Developers
• Test-data teams

Recommended workflow

1. 1

   Prepare the input

   Generate a sample or helper artifact, then copy it into the workflow that needs it.

2. 2

   Run Auto Schema Detector

   Review the preview, copy or download the result, and keep everything local in your browser.

3. 3

   Next recommended tool

   CSV Column Analyzer: Per-column types, ranges, uniques, nulls.

   Open tool
4. 4

   Then continue with

   TypeScript Interface: Generate TS interfaces from JSON.

   Open tool
5. 5

   Then continue with

   JSON → SQL Schema: Generate SQL DDL from sample JSON.

   Open tool

Frequently asked questions

How do I use Auto Schema Detector?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Infer a schema (types, nullability, uniqueness) from any sample dataset.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is Auto Schema Detector free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.