9 offline validators + CVE evidence

Choose the error you need to catch.

Every validator has a prefilled safe example, a live result preview, and a matching REST/MCP interface.

JSON Guard

Validate JSON data against a safe subset of JSON Schema 2020-12.

Try with synthetic data

CSV Doctor

Find absent values, ragged rows and duplicate keys in small CSV data.

Try with synthetic data

Invoice Audit

Recalculate invoice line totals using decimal arithmetic.

Try with synthetic data

Secret Shield

Flag likely secrets in supplied text without revealing matching values.

Try with synthetic data

API Contract Check

Check basic OpenAPI document completeness without network access.

Try with synthetic data

MCP Preflight

Lint MCP server registration metadata without contacting the registry.

Try with synthetic data

Header Audit

Check supplied HTTP response security headers for common weaknesses.

Try with synthetic data

Robots Check

Interpret supplied robots.txt for a requested agent and path.

Try with synthetic data

Schema Diff

Compare shapes of two JSON objects and classify structural changes.

Try with synthetic data

10. CVE Verify

Retrieve public vulnerability records from NIST NVD. This is an older baseline, separate from the nine new offline validators. Open the CVE API reference.

Also explore 22 decision-support prototypes

Tests are free, but not certifications or security audits. Only use synthetic or public data.