Python · local-first · version 1.0.0

Catch data problems before the import.

A dependency-free CSV/JSON checker with deterministic reports, practical examples and no upload step.

Agent checkout — $9 USDCCard checkout coming soon — $12See what is included
No network callsmacOS, Linux and WindowsMIT-licensed code
The agent checkout is a machine-readable x402 endpoint on Base. It returns a payment challenge, then the verified ZIP after settlement.
Included

A report you can explain.

  • CSV, JSON, JSONL and NDJSON inputs
  • Required-field, duplicate-row and duplicate-key checks
  • Mixed JSON type evidence
  • Three datasets with expected reports
  • Shell and PowerShell runners
  • Start guide, recipes, troubleshooting and checklist
$9 USDC · one-time download

Requirements

Python 3.10 or newer. Agent checkout requires an x402-compatible client and USDC on Base.

Structural checks do not prove semantic accuracy, compliance or compatibility with every destination system.

Common questions

Does my data leave my machine?

No. The included tool makes no network calls.

Why does it return exit code 1?

Code 1 means a valid report found issues. Code 2 means the command or file was invalid.

Can I modify the code?

Yes. It is supplied under the MIT license.