Basic structural check for OpenAPI/Swagger specs — required top-level fields, non-empty paths, and $ref presence. A heuristic screen, not a full spec validation: passing here does not guarantee a valid spec. Code never leaves your device — formatting and validation run locally in your browser.
Content reviewed October 2026 · About Toolzum
Generate Swagger UI / OpenAPI specs from a simple description. Enter title, version, and endpoints to produce a complete spec JSON.
Basic syntax sanity check for JSON (full parse), XML (root-element check), and YAML (real js-yaml parse) — JavaScript not included. Code never leaves your device.
Validate RSS/Atom feeds for spec compliance — required fields, date formats, enclosures. Fix podcast feeds Apple rejects — local validation, free, no signup.
Generates a browser extension that captures browser tabs, full screens, or specific application windows with configurable resolution, frame rate. No signup or account required.
Validate IBAN structure, length, and mod-97 check digits for 80+ countries. Catch transfer typos before money moves — local ibantools work, free, no signup.
The check looks for 2.0/3.x markers and top-level structure only — it never parses YAML or resolves $refs, so nested chains and Schema Objects are not actually verified. For full validation, use a dedicated spec validator.
Missing required fields, wrong types, and unresolvable $refs.
Each violation with its JSON path for direct fixing in your editor.
No — validation runs locally in your browser, free with no signup.
Only 3.x is checked (a 2.0 marker is flagged); paths must look like /name: lines, methods need at least 2-space indent (get/post/put/…), responses blocks need 4-space indent, and each response needs a description — mis-indented YAML is the most common failure.
OpenAPI to Postman
Convert OpenAPI specs into Postman collections with requests, auth, and examples. Import 50 endpoints in one click — local conversion, free, no signup.
API Diff Checker
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions.