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Community API catalogs are a good way to find unusual endpoints for a JavaScript project, but a listing is only a lead—not proof that an API is free, reliable, or suitable for production. Shortlist candidates, check the provider’s current documentation and terms, then make a small request in the environment where your app will run.
Here, “underground” and “indie” are informal descriptions for lesser-known or community-discovered APIs, not a verified category of independently owned services. The directories below help with discovery; they do not establish who owns each API.
Where can I find interesting public APIs for a JavaScript project?
Start with directories to explore categories and find candidates, then use the provider’s own documentation to decide whether one fits. Two useful places to browse are:
- public-api-lists, a community-curated catalog with category browsing and contribution guidance. Its records include fields for authentication, HTTPS, and CORS.
- Find Public APIs, a separate directory that brings together attributed catalogs, researched guides, and an in-browser request playground.
Neither directory listing is a guarantee of current availability, support, or acceptable terms. Catalogs change, and the provider’s endpoint and policies are authoritative for your intended use.
#1 Best Overall
Which APIs can I call directly from browser JavaScript?
For a browser request, CORS is a separate requirement from whether an API uses a key or HTTPS. A directory’s CORS field can help you identify possible candidates, but confirm the actual endpoint and browser access in the provider’s documentation. A request that works from Node.js may still be blocked by a browser’s cross-origin policy.
Also distinguish browser code from server-side code. A server can make requests without browser CORS restrictions, but any secret placed in frontend JavaScript can be read by users. Keep private API credentials on a server and have the browser call your own backend when the provider requires a secret.
Rank #2
Do I need an API key, and can I use a free API commercially?
Check authentication, price, usage limits, and permission for your specific use as separate questions. “No key” describes authentication; it does not mean access is free or that commercial use is permitted. Find Public APIs makes this distinction in its FAQ, and the public-api-lists catalog separately tracks authentication, HTTPS, and CORS metadata.
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How do I make my first request with fetch?
JSONPlaceholder documents a fake REST API intended for testing, prototyping, and learning. Its guide shows this browser-style JavaScript request to retrieve posts:
fetch("https://api.jsonplaceholder.dev/posts")
.then(response => {
if (!response.ok) {
throw new Error(`HTTP error: ${response.status}`);
}
return response.json();
})
.then(posts => console.log(posts))
.catch(error => console.error("Request failed:", error));The first then checks whether the HTTP response succeeded before parsing its body as JSON. The next receives the parsed data; the final handler reports a network or HTTP failure. In a real interface, replace console.log with state updates or rendering, and show users an appropriate error rather than silently failing.
Rank #4
JSONPlaceholder’s guide documents six main resource types: users, posts, comments, albums, photos, and todos. It also describes GET, POST, PUT, PATCH, and DELETE methods. These are documentation claims, not an independent availability test; the service is a practice endpoint with fake data, not a dependable source for a production application.
For repeatable experiments, the guide also describes running its server locally by cloning the server repository, installing with Bun, and starting the server. It provides separate Postman collections for the public and local endpoints, and lists cURL, Insomnia, HTTPie, and a VS Code REST Client extension as other request options. Follow the guide for the exact current setup steps.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should I compare API candidates?
Compare services that could solve the same job against the needs of your project, not against directory popularity. Use this checklist before committing to an integration:
- Access: Is a key or other authentication required? Can the request run directly in a browser, or does it need a server?
- Terms and cost: Are there free and paid tiers, usage limits, or commercial-use restrictions? Verify the current terms rather than inferring them from “no key.”
- Data fit: Does the API provide the exact fields, geography, time range, and update cadence you need?
- Documentation: Does the provider explain parameters, response formats, errors, examples, and versioning?
- Operational risk: Can you find rate limits, status information, support options, and a fallback plan? The directory records considered here do not provide a comparable, verified uptime record, so they cannot support reliability rankings.
OpenWeather is one example of a service aimed at real-world weather data rather than practice responses. Its official product page describes APIs for current conditions, forecasts, historical data, air quality, and maps, and directs developers to obtain an API key. It describes both free and paid subscription availability for current-weather data. Check the provider’s current documentation and terms for applicable plans and conditions; plan details can change.
When is an API ready for a production project?
A successful test request proves only that a particular request worked at that moment. Before depending on a service, verify that its data and terms fit your product and decide how your app will behave if the provider is slow, unavailable, or changes its response. For a learning endpoint such as JSONPlaceholder, use it to practice request handling—not to supply live product data.
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