Developer tool APIs help you build, test, and deploy software more efficiently. From code formatting to API testing, these tools are designed to streamline the development workflow.
| Name | Description | Auth | HTTPS | CORS | Status |
|---|---|---|---|---|---|
| 24 Pull Requests | Project to promote open source collaboration during December | none | Yes | yes | unknown |
| API Grátis | Multiples services and public APIs | none | Yes | unknown | unknown |
| ApicAgent | Extract device details from user-agent string | none | Yes | yes | unknown |
| ApiFlash | Chrome based screenshot API for developers | apikey | Yes | unknown | unknown |
| apilayer userstack | Secure User-Agent String Lookup JSON API | oauth | Yes | unknown | unknown |
| APIs.guru | Wikipedia for Web APIs, OpenAPI/Swagger specs for public APIs | none | Yes | unknown | unknown |
| Azure DevOps | The Azure DevOps basic components of a REST API request/response pair | apikey | Yes | unknown | unknown |
| Base | Building quick backends | apikey | Yes | yes | unknown |
| Beeceptor | Build a mock Rest API endpoint in seconds | none | Yes | yes | unknown |
| Bitbucket | Bitbucket API | oauth | Yes | unknown | unknown |
| Blague.xyz | La plus grande API de Blagues FR/The biggest FR jokes API | apikey | Yes | yes | unknown |
| Blitapp | Schedule screenshots of web pages and sync them to your cloud | apikey | Yes | unknown | unknown |
| Blynk-Cloud | Control IoT Devices from Blynk IoT Cloud | apikey | No | unknown | unknown |
| Bored | Find random activities to fight boredom | none | Yes | unknown | unknown |
| Browshot | Easily make screenshots of web pages in any screen size, as any device | apikey | Yes | yes | unknown |
| CDNJS | Library info on CDNJS | none | Yes | unknown | unknown |
| Ciprand | Secure random string generator | none | Yes | no | unknown |
| Cloudflare Trace | Get IP Address, Timestamp, User Agent, Country Code, IATA, HTTP Version, TLS/SSL Version & More | none | Yes | yes | unknown |
| Codex | Online Compiler for Various Languages | none | Yes | unknown | unknown |
| Contentful Images | Used to retrieve and apply transformations to images | apikey | Yes | yes | unknown |
| CORS Proxy | Get around the dreaded CORS error by using this proxy as a middle man | none | Yes | yes | unknown |
| CountAPI | Free and simple counting service. You can use it to track page hits and specific events | none | Yes | yes | unknown |
| Databricks | Service to manage your databricks account,clusters, notebooks, jobs and workspaces | apikey | Yes | yes | unknown |
| DigitalOcean Status | Status of all DigitalOcean services | none | Yes | unknown | unknown |
| Docker Hub | Interact with Docker Hub | apikey | Yes | yes | unknown |
| DomainDb Info | Domain name search to find all domains containing particular words/phrases/etc | none | Yes | unknown | unknown |
| ExtendsClass JSON Storage | A simple JSON store API | none | Yes | yes | unknown |
| GeekFlare | Provide numerous capabilities for important testing and monitoring methods for websites | apikey | Yes | unknown | unknown |
| GitHub | Make use of GitHub repositories, code and user info programmatically | oauth | Yes | yes | unknown |
| Gitlab | Automate GitLab interaction programmatically | oauth | Yes | unknown | unknown |
| Gitter | Chat for Developers | oauth | Yes | unknown | unknown |
| Glitterly | Image generation API | apikey | Yes | yes | unknown |
| Google Docs | API to read, write, and format Google Docs documents | oauth | Yes | unknown | unknown |
| Google Firebase | Google's mobile application development platform that helps build, improve, and grow app | apikey | Yes | yes | unknown |
| Google Fonts | Metadata for all families served by Google Fonts | apikey | Yes | unknown | unknown |
| Google Keep | API to read, write, and format Google Keep notes | oauth | Yes | unknown | unknown |
| Google Sheets | API to read, write, and format Google Sheets data | oauth | Yes | unknown | unknown |
| Google Slides | API to read, write, and format Google Slides presentations | oauth | Yes | unknown | unknown |
| Gorest | Online REST API for Testing and Prototyping | oauth | Yes | unknown | unknown |
| Hasura | GraphQL and REST API Engine with built in Authorization | apikey | Yes | yes | unknown |
| Heroku | REST API to programmatically create apps, provision add-ons and perform other task on Heroku | oauth | Yes | yes | unknown |
| Host.io | Domains Data API for Developers | apikey | Yes | yes | unknown |
| HTTP2.Pro | Test endpoints for client and server HTTP/2 protocol support | none | Yes | unknown | unknown |
| Httpbin Cloudflare | A Simple HTTP Request & Response Service with HTTP/3 Support by Cloudflare | none | Yes | yes | unknown |
| Hunter | API for domain search, professional email finder, author finder and email verifier | apikey | Yes | unknown | unknown |
| IBM Text to Speech | Convert text to speech | apikey | Yes | yes | unknown |
| Icanhazip | IP Address API | none | Yes | yes | unknown |
| IFTTT | IFTTT Connect API | none | Yes | unknown | unknown |
| Image-Charts | Generate charts, QR codes and graph images | none | Yes | yes | unknown |
| import.io | Retrieve structured data from a website or RSS feed | apikey | Yes | unknown | unknown |
| ip-fast.com | IP address, country and city | none | Yes | yes | unknown |
| IPify | A simple IP Address API | none | Yes | unknown | unknown |
| IPinfo | Another simple IP Address API | none | Yes | unknown | unknown |
| jsDelivr | Package info and download stats on jsDelivr CDN | none | Yes | yes | unknown |
| License-API | Unofficial REST API for choosealicense.com | none | Yes | no | unknown |
| MAC address vendor lookup | Retrieve vendor details and other information regarding a given MAC address or an OUI | apikey | Yes | yes | unknown |
| Micro DB | Simple database service | apikey | Yes | unknown | unknown |
| MicroENV | Fake Rest API for developers | none | Yes | unknown | unknown |
| Mocky | Mock user defined test JSON for REST API endpoints | none | Yes | yes | unknown |
| MY IP | Get IP address information | none | Yes | unknown | unknown |
| Netlify | Netlify is a hosting service for the programmable web | oauth | Yes | unknown | unknown |
| NetworkCalc | Network calculators, including subnets, DNS, binary, and security tools | none | Yes | yes | unknown |
| npm Registry | Query information about your favorite Node.js libraries programatically | none | Yes | unknown | unknown |
| OneSignal | Self-serve customer engagement solution for Push Notifications, Email, SMS & In-App | apikey | Yes | unknown | unknown |
| Open Page Rank | API for calculating and comparing metrics of different websites using Page Rank algorithm | apikey | Yes | unknown | unknown |
| OpenAPIHub | The All-in-one API Platform | x-mashape-key | Yes | unknown | unknown |
| OpenGraphr | Really simple API to retrieve Open Graph data from an URL | apikey | Yes | unknown | unknown |
| oyyi | API for Fake Data, image/video conversion, optimization, pdf optimization and thumbnail generation | none | Yes | yes | unknown |
| PageCDN | Public API for javascript, css and font libraries on PageCDN | apikey | Yes | yes | unknown |
| Postman | Tool for testing APIs | apikey | Yes | unknown | unknown |
| ProxyCrawl | Scraping and crawling anticaptcha service | apikey | Yes | unknown | unknown |
| ProxyKingdom | Rotating Proxy API that produces a working proxy on every request | apikey | Yes | yes | unknown |
| Pusher Beams | Push notifications for Android & iOS | apikey | Yes | unknown | unknown |
| QR code | Create an easy to read QR code and URL shortener | none | Yes | yes | unknown |
| Qrcode Monkey | Integrate custom and unique looking QR codes into your system or workflow | none | Yes | unknown | unknown |
| Random Stuff | Can be used to get AI Response, jokes, memes, and much more at lightning-fast speed | apikey | Yes | yes | unknown |
| ReqRes | A hosted REST-API ready to respond to your AJAX requests | none | Yes | unknown | unknown |
| RSS feed to JSON | Returns RSS feed in JSON format using feed URL | none | Yes | yes | unknown |
| SavePage.io | A free, RESTful API used to screenshot any desktop, or mobile website | apikey | Yes | yes | unknown |
| ScrapeNinja | Scraping API with Chrome fingerprint and residential proxies | apikey | Yes | unknown | unknown |
| ScraperApi | Easily build scalable web scrapers | apikey | Yes | unknown | unknown |
| scraperBox | Undetectable web scraping API | apikey | Yes | yes | unknown |
| scrapestack | Real-time, Scalable Proxy & Web Scraping REST API | apikey | Yes | unknown | unknown |
| ScrapingAnt | Headless Chrome scraping with a simple API | apikey | Yes | unknown | unknown |
| ScrapingDog | Proxy API for Web scraping | apikey | Yes | unknown | unknown |
| Screenshot | Take programmatic screenshots of web pages from any website | apikey | Yes | yes | unknown |
| ScreenshotAPI.net | Create pixel-perfect website screenshots | apikey | Yes | yes | unknown |
| serpstack | Real-Time & Accurate Google Search Results API | apikey | Yes | yes | unknown |
| Sonar | Project Sonar DNS Enumeration API | none | Yes | yes | unknown |
| SonarQube | SonarQube REST APIs to detect bugs, code smells & security vulnerabilities | oauth | Yes | unknown | unknown |
| StackExchange | Q&A forum for developers | oauth | Yes | unknown | unknown |
| Supportivekoala | Autogenerate images with template | apikey | Yes | yes | unknown |
| Tyk | Api and service management platform | apikey | Yes | yes | unknown |
| Userstack | Secure User-Agent String Lookup JSON API | oauth | Yes | unknown | unknown |
| Wandbox | Code compiler supporting 35+ languages mentioned at wandbox.org | none | Yes | unknown | unknown |
| WebScraping.AI | Web Scraping API with built-in proxies and JS rendering | apikey | Yes | yes | unknown |
| ZenRows | Web Scraping API that bypasses anti-bot solutions while offering JS rendering, and rotating proxies | apikey | Yes | unknown | unknown |
37 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
44 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Look for APIs marked as "alive" in the status column — these were recently verified as working. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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