Jobs with GraphQL.
GraphQL Jobs API is a free Jobs API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

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Yes. The GraphQL Jobs API is listed in the Jobs category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The GraphQL Jobs API requires no authentication, so you can start making requests without signing up.
Yes. The GraphQL Jobs API supports CORS, so front-end JavaScript can call it directly.
Yes. The GraphQL Jobs API is served over HTTPS, so it's safe to use in production.