[dandevs]

> Why don't more companies publish either a specification for their API or an API client on a website like GitHub?

Being API-first and caring about the developer experience (DX) is still a new phenomenon. Companies like Twilio and Stripe differentiated in DX. Now there's a whole category of API-first startups like seam.co (API for IoT devices), merge.dev (unified API for 180+ integrations), and stytch.com (API for authentication) who publish API clients in major languages like Node.js, Python, Java, and Go. They also publish their OpenAPI specs in case you use a long-tail language and want to generate a client yourself.

IMO, in the next 5 years, it'll become the norm to offer clients if you have a public REST API.