libopenapi - enterprise grade OpenAPI tools for golang.

libopenapi has full support for Swagger (OpenAPI 2), OpenAPI 3, and OpenAPI 3.1. It can handle the largest and most complex specifications you can think of.

Sponsors & users

If your company is using libopenapi, please considering supporting this project, like our very kind sponsors:

Speakeasy

scalar

libopenapi is pretty new, so our list of notable projects that depend on libopenapi is small (let me know if you'd like to add your project)

• github.com/daveshanley/vacuum - "The world's fastest and most scalable OpenAPI/Swagger linter/quality tool"
• github.com/pb33f/openapi-changes - "The world's sexiest OpenAPI breaking changes detector"
• github.com/pb33f/wiretap - "The world's coolest OpenAPI compliance analysis tool"
• github.com/danielgtaylor/restish - "Restish is a CLI for interacting with REST-ish HTTP APIs"
• github.com/speakeasy-api/speakeasy - "Speakeasy CLI makes validating OpenAPI docs and generating idiomatic SDKs easy!"
• github.com/apicat/apicat - "AI-powered API development tool"
• github.com/mattermost/mattermost - "Software development lifecycle platform"
• Your project here?

Come chat with us

Need help? Have a question? Want to share your work? Join our discord and come say hi!

Check out the libopenapi-validator

Need to validate requests, responses, parameters or schemas? Use the new libopenapi-validator module.

Documentation

See all the documentation at https://pb33f.io/libopenapi/

• Installing libopenapi
• Using OpenAPI
• Using Swagger
• The Data Model
• Validation
• Modifying / Mutating the OpenAPI Model
• Mocking / Creating Examples
• Using Vendor Extensions
• The Index
• The Resolver
• The Rolodex
• Circular References
• Bundling Specs
• What Changed / Diff Engine
• FAQ
• About libopenapi

Quick-start tutorial

👀 Get rolling fast using libopenapi with the Parsing OpenAPI files using go guide 👀

Or, follow these steps and see something in a few seconds.

Step 1: Grab the petstore

curl https://raw.githubusercontent.com/OAI/OpenAPI-Specification/main/examples/v3.0/petstore.yaml > petstorev3.json

Step 2: Grab libopenapi

go get github.com/pb33f/libopenapi

Step 3: Parse the petstore using libopenapi

Copy and paste this code into a main.go file.

package main

import (
	"fmt"
	"os"
	"github.com/pb33f/libopenapi"
)

func main() {
	petstore, _ := os.ReadFile("petstorev3.json")
	document, err := libopenapi.NewDocument(petstore)
	if err != nil {
		panic(fmt.Sprintf("cannot create new document: %e", err))
	}
	docModel, errors := document.BuildV3Model()
	if len(errors) > 0 {
		for i := range errors {
			fmt.Printf("error: %e\n", errors[i])
		}
		panic(fmt.Sprintf("cannot create v3 model from document: %d errors reported", len(errors)))
	}

	// The following fails after the first iteration
	for schemaPairs := docModel.Model.Components.Schemas.First(); schemaPairs != nil; schemaPairs = schemaPairs.Next() {
		schemaName := schemaPairs.Key()
		schema := schemaPairs.Value()
		fmt.Printf("Schema '%s' has %d properties\n", schemaName, schema.Schema().Properties.Len())
	}
}

Run it, which should print out:

Schema 'Pet' has 3 properties
Schema 'Error' has 2 properties

Read the full docs at https://pb33f.io/libopenapi/

Logo gopher is modified, originally from egonelbre