Validate OpenAPI/Swagger spec syntax. Check for required fields, missing paths, and structural issues in your API specification. Everything runs locally in your browser — nothing is uploaded.
Validate GraphQL schema syntax and structure. Detect missing root types, unknown type references, and common schema issues.
Generate mock API responses from OpenAPI spec fragments. Create realistic sample data for API development and testing.
Generate Swagger UI / OpenAPI specs from a simple description. Enter title, version, and endpoints to produce a complete spec JSON.
Validates the structure, length, and check digits of IBANs from 70+ countries using the official ISO 13616 modulus-97 algorithm. Everything runs locally in your browser — nothing is uploaded.
Check and correct grammar, spelling, and punctuation in your text. Detects common errors including homophones, misspellings, punctuation issues, and run-on sentences.
OpenAPI Validator lets you validate OpenAPI/Swagger spec syntax. Check for required fields, missing paths, and structural issues in your API specification. Everything runs locally in your browser — nothing is uploaded.. It works on any device with a modern web browser.
Validate OpenAPI/Swagger spec syntax. Check for required fields, missing paths, and structural issues in your API specification. Everything runs locally in your browser — nothing is uploaded. It runs entirely in your browser — no software installation or data uploads required.
Paste or type your content directly into the provided text area.
Yes. After the initial page load, OpenAPI Validator runs entirely on your device with no internet connection needed. All processing is done locally.
Validate OpenAPI/Swagger spec syntax. Check for required fields, missing paths, and structural issues in your API specification. All processing runs locally — no code is sent to any server.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check the tool description for specifics.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. Formatters use well-known libraries (sql-formatter, Prettier-compatible patterns) and follow widely adopted rules.
OpenAPI to Postman
Convert OpenAPI specs to Postman collection JSON format. Import directly into Postman. Everything runs locally in your browser — nothing is uploaded.
API Diff Checker
Compare two OpenAPI specs side-by-side to detect breaking changes, new endpoints, removed fields, and modified schemas between versions.