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OpenAPI Spec Generator

Online OpenAPI spec generator with visual API info and endpoint editing, generating OpenAPI 3.0 documents in real time and exporting JSON or YAML.

API Info

API Endpoints

Click "Add Endpoint" to create your first API endpoint

Quick Templates

OpenAPI Spec

Fill API fields and endpoints, then the spec updates automatically

Structure Stats

Endpoints

0

Paths

0

Output Size

0 B



Documentation

About OpenAPI Spec Generator

This tool visually builds API metadata/endpoints and generates OpenAPI specs in JSON or YAML.

Key Features

  • API Metadata: Title, version, description, server URL, base path.
  • Endpoint Management: Add and configure operations.
  • Templates: CRUD/REST/Auth starter presets.
  • Format Switching: JSON and YAML outputs.
  • Stats Panel: Endpoint/path count and output size.
  • Export Actions: Copy and download.

Steps

  1. Fill API metadata.
  2. Add/configure endpoints.
  3. Choose JSON or YAML output.
  4. Review generated spec and stats.
  5. Copy/download result.

Use Cases

  • Drafting API contracts for new projects.
  • Standardizing legacy API documentation.
  • Sharing consistent API specs across teams.

FAQ

Can output be used directly in Swagger UI?

Usually yes as a baseline; run schema validation and enrich details before publishing.

Do templates cover complex auth scenarios?

Templates are starters; advanced auth/components should be extended manually.