Category5free & open source
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Development

Developer tooling APIs — GitHub, GitLab, CI/CD pipelines, package registries, code quality gates, container orchestration, and engineering metrics for DevOps and platform engineering teams.

24APIs
Most Popular In
Version Control & SCMCI/CD PipelinesPackage Registries
Auth Breakdown
API Key50%
No Auth46%
OAuth4%
Notable Developers
GitHubGitLabVercelDockerNetlify
Updated Jun 12, 2026
Curated by FreeAPIHub editors
Topics:Version Control & SCMCI/CD PipelinesPackage RegistriesCode Quality & SecurityContainer APIsEngineering Metrics
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Top Resources
Redoc API Documentation Tool logo

Redoc API Documentation Tool

API · Development
Free tierNo Auth

Redoc is an open-source API documentation tool from Redocly that renders an OpenAPI document into a polished, readable three-panel reference site - an alternative to Swagger UI.

27K+ usersNot rated yetView
Apidog API logo

Apidog API

API · Development
Free tierAPI Key

Apidog is an all-in-one API development platform - design, documentation, debugging, mocking and automated testing in one tool. It is a Postman and Swagger alternative you use, not a public REST API.

5K+ usersNot rated yetView
JSONPlaceholder logo

JSONPlaceholder

API · Development
FreeNo Auth

JSONPlaceholder is a free fake REST API for testing and prototyping, serving dummy posts, comments, users and todos over standard endpoints, with simulated writes and no API key.

25K+ usersNot rated yetView
HTTP Cat API logo

HTTP Cat API

API · Development
FreeNo Auth

http.cat pairs every HTTP status code with a cat picture. Request a code and get the matching image straight from a URL - no key, no setup - perfect for friendly error pages, docs and demos.

12K+ usersNot rated yetView
HTTPBin logo

HTTPBin

API · Development
FreeNo Auth

httpbin is a free HTTP request and response testing service. Hit endpoints like /get, /post, /status and /headers and it echoes back exactly what your client sent - ideal for debugging HTTP clients.

14K+ usersNot rated yetView
Appwrite Backend API logo

Appwrite Backend API

API · Development
FreemiumAPI Key

Appwrite is an open-source backend platform - a Firebase alternative - giving apps authentication, databases, storage, serverless functions and realtime through one API.

33K+ usersNot rated yetView
Amazon Q Developer API logo

Amazon Q Developer API

🔥 Hot
Development

Amazon Q Developer is AWS's AI assistant for coding - inline suggestions, chat and agents for tests, transformations and AWS help - used inside IDEs, the CLI and the AWS console.

Free tierAPI Key
View details
Qodo AI API logo

Qodo AI API

🔥 Hot
Development

Qodo (formerly CodiumAI) is an AI platform for code quality - generating meaningful tests, reviewing pull requests and answering questions about your code - through IDE plugins and a Git PR agent.

Free tierAPI Key
View details
HTTP Dog API logo

HTTP Dog API

🔥 Hot
Development

HTTP.dog pairs every HTTP status code with a dog photo. Request a code and get the matching image - no key, no setup - perfect for friendly error pages, docs and learning status codes.

FreeNo Auth
View details
OpenHands API logo

OpenHands API

🔥 Hot
Development

OpenHands (formerly OpenDevin) is an open-source platform for AI software-engineering agents that write code, run commands and browse the web in a sandbox. Self-host it, or use OpenHands Cloud and its API.

Free tierNo Auth
View details
Bump.sh API Docs Tool logo

Bump.sh API Docs Tool

🔥 Hot
Development

Bump.sh hosts beautiful API documentation and catalogs generated from your OpenAPI or AsyncAPI definitions, and automatically detects and shows the changes between versions on every deploy.

Free tierAPI Key
View details
Temporal Workflow API logo

Temporal Workflow API

🔥 Hot
Development

Temporal is a durable execution platform that runs your application code as reliable, long-running workflows - retrying, resuming and surviving failures - via SDKs for Go, Java, TypeScript, Python and .NET.

FreemiumNo Auth
View details
gRPC API logo

gRPC API

🔥 Hot
Development

gRPC is an open-source, high-performance RPC framework from Google and the CNCF that uses Protocol Buffers and HTTP/2 to connect services with typed contracts across many languages.

Open SourceOAuth
View details
Cursor API logo

Cursor API

🔥 Hot
Development

Cursor is an AI-first code editor, and its API lets teams read usage and spend, manage members, and launch background agents that make code changes programmatically.

FreemiumAPI Key
View details
ReadMe API Documentation Platform logo

ReadMe API Documentation Platform

🔥 Hot
Development

ReadMe is a developer documentation platform with an API to manage docs programmatically - sync your OpenAPI spec, update guide pages and categories, and publish changelogs.

Free tierAPI Key
View details
DreamFactory API logo

DreamFactory API

🔥 Hot
Development

DreamFactory is an open-source platform that auto-generates secure REST APIs from your databases and services - point it at a SQL or NoSQL database and it builds documented, role-controlled endpoints instantly.

Free tierAPI Key
View details
OpenAPI Specification API logo

OpenAPI Specification API

🔥 Hot
Development

The OpenAPI Specification (OAS) is an open standard for describing REST APIs in a machine-readable YAML or JSON document, powering docs, code generation, mocks and testing.

FreemiumNo Auth
View details
JSON Schema API logo

JSON Schema API

🔥 Hot
Development

JSON Schema is an open standard for describing and validating the structure of JSON data. You write a schema declaring types, required fields and constraints, then validate documents against it with any compliant library.

FreeNo Auth
View details
Tabnine API logo

Tabnine API

🔥 Hot
Development

Tabnine is an AI code-completion assistant for your editor - whole-line and full-function suggestions plus chat, with a strong focus on privacy and the option to run on private or self-hosted models.

Free tierAPI Key
View details
Stoplight Elements API Docs logo

Stoplight Elements API Docs

🔥 Hot
Development

Stoplight Elements is an open-source web component that renders your OpenAPI description into interactive, try-it API documentation. Drop in one custom element or React component - no key, no backend.

Free tierNo Auth
View details
Bolt.new API logo

Bolt.new API

🔥 Hot
Development

Bolt.new is an AI web-app builder from StackBlitz. Describe an app in plain language and it generates, runs and lets you edit a full-stack project in the browser, then deploy it. A dev tool, not a public REST API.

Free tierAPI Key
View details
Scalar API Documentation Tool logo

Scalar API Documentation Tool

🔥 Hot
Development

Scalar is an open-source API documentation tool that renders an OpenAPI document into clean, interactive docs with a built-in API client - an alternative to Swagger UI and Redoc.

Free tierNo Auth
View details
v0 API (Vercel) logo

v0 API (Vercel)

🔥 Hot
Development

The v0 API by Vercel generates React and Next.js UI code - styled with Tailwind and shadcn/ui - from a text prompt, through an OpenAI-compatible chat endpoint.

FreemiumAPI Key
View details
GitHub Copilot API logo

GitHub Copilot API

🔥 Hot
Development

GitHub Copilot is an AI pair programmer offering inline code completions, chat and agents inside your editor and on GitHub - accessed through GitHub auth, not a simple public REST API.

Free tierAPI Key
View details
Showing 24 of 24 resources

At a glance

Compare the top Development APIs

Browse all APIs
APIAccessAuthFormatsRating
Redoc API Documentation Tool logo
Redoc API Documentation Tool
Free tierNo AuthRESTJSONView
Apidog API logo
Apidog API
Free tierAPI KeyRESTJSONView
JSONPlaceholder logo
JSONPlaceholder
FreeNo AuthRESTJSONView
HTTP Cat API logo
HTTP Cat API
FreeNo AuthRESTJSONView
HTTPBin logo
HTTPBin
FreeNo AuthRESTJSONView
Appwrite Backend API logo
Appwrite Backend API
FreemiumAPI KeyRESTJSONView
Amazon Q Developer API logo
Amazon Q Developer API
Free tierAPI KeyRESTJSONView
Qodo AI API logo
Qodo AI API
Free tierAPI KeyRESTJSONView

About this category

Development — developer guide

What Are Development APIs?

Development APIs are the programmatic interface to the engineering toolchain — everything between a developer committing code and that code running in production. They let you build custom developer portals, automated release pipelines, internal engineering dashboards, and developer experience tooling that integrates deeply with the platforms your team already uses. Platform engineers use these APIs to enforce standards, measure engineering health, and automate toil that would otherwise consume hours of developer time per sprint.

What Platform Teams Build

  • Internal developer portals aggregating GitHub PR status, CI builds, and deployment state in one view
  • Automated release trains that tag versions, generate changelogs, and publish packages on merge
  • Engineering metrics dashboards tracking DORA metrics: deployment frequency, lead time, MTTR, change failure rate
  • Dependency audit bots that open PRs when packages have known CVEs in npm, PyPI, or Maven registries
  • Repository scaffolding tools that create standardised project structures from templates
  • Cost attribution dashboards mapping cloud spend to individual engineering teams and features

Essential APIs for Every Engineering Team

The GitHub REST and GraphQL APIs are the most complete — covering repositories, pull requests, actions, packages, deployments, and security alerts. GitLab API mirrors this for self-hosted teams with a unified DevSecOps platform API. Vercel and Netlify expose deployment and preview environment APIs that integrate seamlessly into CI workflows. The Docker Hub API and GitHub Container Registry cover container image management. For package metadata, the npm Registry API, PyPI API, and Crates.io API are all free and unauthenticated for read access.