What does this free Swagger / OpenAPI editor give you?
This free editor lets you author Swagger 2.0 or OpenAPI (3.0, 3.1) specifications in YAML or JSON and see them rendered as visual documentation instantly. Built-in validation flags syntax and governance issues as you write, so this Swagger editor catches problems before you ship.
Which formats are supported?
Swagger 2.0, OpenAPI 3.0, and OpenAPI 3.1, in either YAML or JSON. Format and version are detected automatically.
Can I import Swagger specs into Postman?
Yes. Postman imports Swagger 2.0 specifications directly. Once your spec is clean here, paste it into Postman to generate a Collection that stays in two-way sync with the spec as it evolves.
What does Postman Spec Hub give you?
Spec Hub extends this into a visual editor with an outline view and code snippets, and covers OpenAPI, AsyncAPI, GraphQL, Proto, and Smithy in one place. You can generate a Postman Collection from your Specification and keep it in sync as the collection changes. You can define custom governance rules and use the Postman CLI to lint your spec in your CI pipelines. You can also sync specs to git and generate a full SDK straight from the finished spec.
Can I turn this spec into something I can actually run and test?
Your spec generates a Collection you can run and test directly, staying in two-way sync as the spec evolves.
How can I keep my collection in sync with the spec?
Spec Hub lets you update the collection once the spec is updated — this way your collections always stay in sync with the specification.
Can I generate a specification from a collection?
Yes — you can start with a collection and enrich it with type information. The collection can then be converted into a specification and kept in sync, so Postman supports two-way sync between collections and specifications.
Why does my validation error not make sense?
OpenAPI validation errors often point at a symptom rather than the root cause — a missing required field upstream can surface as an unrelated error several lines later.
I need both REST and WebSocket support — should I use OpenAPI or AsyncAPI?
OpenAPI covers REST; AsyncAPI covers event-driven and WebSocket APIs.
Spec Hub supports both in one place if your API needs both.