Covid-19 India
Covid 19 statistics state and district wise about cases, vaccinations, recovery within India
Open-source API for exploring Covid19 cases based on JHU CSSE.
Covid-19 JHU CSSE API is a free Health API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Simply Fast API for covid-19 cases exploration
Details from nuttaphat.com.

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Covid 19 statistics state and district wise about cases, vaccinations, recovery within India
Global and countrywise data of Covid 19 daily Summary, confirmed cases, recovered and deaths
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Yes. The Covid-19 JHU CSSE API is listed in the Health 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 Covid-19 JHU CSSE API requires no authentication, so you can start making requests without signing up.
Yes. The Covid-19 JHU CSSE API supports CORS, so front-end JavaScript can call it directly.
Yes. The Covid-19 JHU CSSE API is served over HTTPS, so it's safe to use in production.