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Quickstart Example

A minimal 5-minute introduction to oastools, demonstrating the parse and validate workflow.

What You'll Learn

  • How to parse an OpenAPI specification with oastools
  • How to validate a specification against OAS schema rules
  • How to access parsed document structure programmatically

Prerequisites

  • Go 1.24+
  • oastools module dependency (auto-fetched)

Quick Start

  1. Clone the repository:
git clone https://github.com/erraggy/oastools.git
cd oastools/examples/quickstart
  1. Run the example:
go run main.go
  1. Expected output:
oastools Quickstart
===================

[1/3] Parsing OpenAPI specification...
      Version: 3.0.3
      Format: yaml

[2/3] Validating against OAS schema...
      Valid: true
      Errors: 0
      Warnings: 0

[3/3] Accessing document structure...
      API Title: Quickstart API
      API Version: 1.0.0
      Paths: 1
      Schemas: 1

      Paths defined:
        - /hello
      Schemas defined:
        - Greeting

---
Quickstart complete!

Files

File Purpose
spec.yaml Minimal OpenAPI 3.0.3 specification (27 lines)
main.go Demonstrates parse → validate → inspect workflow
go.mod Go module definition

Key Concepts

Parse-Once Pattern: The example uses parser.ParseWithOptions() to parse the specification once, then passes the result to validator.ValidateParsed(). This avoids re-parsing and provides significant performance improvement for repeated operations.

Version-Agnostic Access: The AsAccessor() method returns a DocumentAccessor interface that works identically for OAS 2.0, 3.0.x, 3.1.x, and 3.2.0 documents, abstracting away version-specific structure differences.

Validation Severity Levels: oastools uses four severity levels:

  • Critical - Specification cannot be processed
  • Error - Violates OpenAPI specification requirements
  • Warning - Best practice recommendations
  • Info - Informational notes

Next Steps

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