CONTENT

Random Fact API

GET/fact

Fetch a short fact about nature, space, history, and more.

No signup or API key required.

Parameters

No endpoint-specific parameters. Use format to choose the response representation.

formatenumoptional · query: Response format. Defaults to json.
jsontext

No request body. Unknown or repeated query parameters return HTTP 400.

Returns 200 OK

A JSON object with the following fields.

factstring: One curated fact about nature, space, inventions, history, or language.

Plain text

With format=text: Only the fact value, without the JSON wrapper.

Errors

Validation and service errors always return JSON, including when format=text.

errorstring: A machine-readable error code, such as invalid_parameter or rate_limited.
messagestring: A description of the problem.

400 Invalid parameters.

414 Query string exceeds 2048 characters.

429 Rate limit reached. Wait the seconds in Retry-After before retrying.

Usage notes

367 curated facts covering nature, space, inventions, history, and language. Sources are recorded in the repository.

Add a trivia card to a demo or an educational side project. Each request draws from the curated collection; use /daily/fact for a shared daily selection.

Responses are not cached. Browser requests are supported through open CORS.

120 requests per minute per IP, with up to 30 per 10 seconds, shared across APIs. Limits are approximate per Cloudflare location. Full usage limits ↗