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wtf is hono-openapi?

grant0417/hono-openapi — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2026-01-10

Audience · developerComplexity · 2/5QuietSetup · easy

TL;DR

A tool that automatically turns your Hono API's validation rules into OpenAPI documentation, so you don't have to hand-write API docs.

Mindmap

mindmap
  root((repo))
    What it does
      Generates OpenAPI docs
      Reads validation schemas
      Stays in sync with code
    Tech stack
      Hono
      OpenAPI
      Standard Schema
    Use cases
      Auto document APIs
      Interactive API explorer
      Share docs with frontend
    Audience
      Backend developers
      API teams
      Startups
    Notable
      Actively developed
      Framework agnostic validation

Code map

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Why would anyone build with this?

REASON 1

Automatically generate OpenAPI docs for a Hono-based backend API.

REASON 2

Create an interactive API explorer for frontend developers to reference.

REASON 3

Keep API documentation in sync automatically as validation rules change.

REASON 4

Generate client code or testing tools from a machine-readable API spec.

What's in the stack?

HonoOpenAPITypeScript

How it stacks up

grant0417/hono-openapi0verflowme/alarm-clock0verflowme/seclists
Language—CSS—
Last pushed2026-01-102022-10-032020-05-03
MaintenanceQuietDormantDormant
Setup difficultyeasyeasyeasy
Complexity2/52/51/5
Audiencedevelopervibe coderops devops

Figures from each repo's GitHub metadata at analysis time.

How do you spin it up?

Difficulty · easy Time to first run · 30min

Requires a validation library that follows the Standard Schema format.

Yoink these prompts

Prompt 1
Show me how to use hono-openapi to generate OpenAPI docs from my Hono route validation schemas.
Prompt 2
Help me set up an interactive API explorer for my Hono app using hono-openapi.
Prompt 3
Explain how hono-openapi converts Standard Schema validation rules into an OpenAPI spec.
Prompt 4
Write a Hono API endpoint with validation and show the OpenAPI documentation hono-openapi would generate for it.

Frequently asked questions

wtf is hono-openapi?

A tool that automatically turns your Hono API's validation rules into OpenAPI documentation, so you don't have to hand-write API docs.

Is hono-openapi actively maintained?

Quiet — no commits in 6-12 months (last push 2026-01-10).

How hard is hono-openapi to set up?

Setup difficulty is rated easy, with roughly 30min to a first successful run.

Who is hono-openapi for?

Mainly developer.

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