validation

Check an OpenAPI 3.x spec for missing fields, bad paths, and duplicate operationIds.

Check a Swagger 2.0 spec for missing fields, bad paths, and duplicate operationIds.

Check GraphQL SDL for unbalanced braces, bad field syntax, duplicate types, and unknown type references.

Clamp every character's ASCII code into a chosen [min, max] range, replacing out-of-range codes with the nearest bound.

Extract a substring from strict-ASCII text using start/end index slicing, including negative indices.

Cut strict-ASCII text to its first N characters and report exactly how many were removed.

Audit a whole block of text and list every character outside strict 7-bit ASCII, not just the first.

Check whether JavaScript is syntactically valid and see the exact error location.

Check whether CSS is syntactically valid and see the exact error location.

Check whether HTML is well-formed and see the exact error location.

Generate a JSON Schema (draft-07) from a JSON sample.

Generate a Zod schema and inferred TypeScript type from a JSON sample.

Check whether your JSON is syntactically valid.

Check LLM-generated JSON against practical guardrails before you parse it.

Catch unclosed code fences, skipped heading levels, and other structural Markdown mistakes.

Check whether XML is well-formed and see its element, attribute, and depth stats.

Edit XML in place with live well-formedness feedback and one-click formatting.

See the maximum nesting depth of an XML document at a glance.

Check whether YAML is syntactically valid and inspect its structure.

Check a pasted commit message against the Conventional Commits spec and list every issue found.

Clamp every integer in a list into a minimum/maximum range.