Validate OpenAPI specs, generate clean API docs, create request snippets, convert JSON responses into schemas, and detect breaking API changes in your browser.
OpenAPI Studio is a browser-first API contract workspace for developers, QA engineers, and technical writers who need to validate OpenAPI 3.0/3.1 specs, preview docs, generate request snippets, infer schemas from JSON, and compare API versions for breaking changes.
Everything runs locally in your browser. Paste JSON or YAML, load the sample spec, or drag in a .json, .yaml, or .yml file. The studio keeps validation, docs, snippets, JSON-to-schema, and API diff workflows in one compact Google-style workspace instead of scattering them across separate utilities.
Parse JSON or YAML, detect OpenAPI 3.0/3.1, check required fields, paths, operations, parameters, request bodies, responses, schemas, and duplicate operation IDs.
Generate clean endpoint documentation grouped by tag with method badges, parameter tables, request bodies, responses, examples, Markdown export, and HTML export.
Pick server, endpoint, path/query/header values, content type, and auth type to generate cURL, JavaScript fetch, and Python requests snippets.
Convert a sample JSON object or array into OpenAPI 3.0 or 3.1 schema output with required-field detection, nullable handling, format detection, YAML, JSON, component, and response modes.
Compare old and new specs to find removed endpoints, added endpoints, removed methods, response field removals, type changes, and new required request fields.
Specs and API samples are processed in the browser. They are not uploaded to Kitpace, stored, or sent to a server.
Use OpenAPI JSON/YAML directly in the editor, drag in a .json/.yaml/.yml file, or load the included sample.
Validate the contract, preview docs, create request snippets, infer a schema from JSON, or compare old and new specs.
Read status cards, issue tables, docs sections, code snippets, generated schemas, or breaking-change reports.
Copy issues, Markdown, HTML, snippets, YAML, JSON, or diff reports, then download the artifact you need.
openapi: 3.1.0`ninfo:`n title: Kitpace API`n version: 1.0.0`npaths:`n /users:`n get:`n responses:`n "200":`n description: OKDetect version, title, paths, operations, response coverage, and validation warnings.
GET /users/{id}`nServer: https://api.example.com/v1`nAuth: Bearer tokenCreate cURL, JavaScript fetch, and Python requests examples from the selected operation.
Old: GET /users returns id,email`nNew: GET /users returns idFlag removed response fields and removed endpoints as breaking changes.
No. OpenAPI Studio runs locally in your browser. Your spec, JSON samples, and diff inputs are not uploaded to Kitpace.
Yes. It detects OpenAPI 3.0.x and 3.1.x, and treats nullable schema behavior differently for each version.
Yes. Paste a JSON object or array, choose OpenAPI 3.0 or 3.1, and export schema-only, component schema, or response object output.
Yes. The API Diff tab detects removed endpoints, removed methods, removed response fields, changed field types, and new required request fields.
Yes. The Docs Preview tab renders title, version, server, auth summary, endpoint groups, parameters, request bodies, responses, examples, Markdown, and HTML.
OpenAPI Studio is designed as a fast browser-first MVP for validation, docs preview, snippets, schema generation, and API diffs. It is not a full API lifecycle platform.
Kitpace ships 80+ free, browser-based tools for developers, designers, marketers, and everyday tasks. No signup, no tracking, no fees.
Checking an OpenAPI YAML file before sharing docs, merging a pull request, or publishing an API contract
Use OpenAPI JSON/YAML directly in the editor, drag in a .json/.yaml/.yml file, or load the included sample.
Parse JSON or YAML, detect OpenAPI 3.0/3.1, check required fields, paths, operations, parameters, request bodies, responses, schemas, and duplicate operation IDs.
OpenAPI Studio by Kitpace is a free browser-based API contract workspace. It helps developers validate OpenAPI 3.0 and 3.1 specs, preview API docs, generate cURL, JavaScript, and Python request snippets, convert JSON responses into OpenAPI schemas, and compare API changes without signup.