Axios

1. Getting started

   What Axios is, its promise-based API, and making basic requests in browsers and Node.js.

2. Request config

   Options for each request such as url, method, headers, params, data, timeout and responseType.

3. Response schema

   Shape of the response object: data, status, statusText, headers and config.

4. The Axios instance

   Creating instances with shared base URL, headers and defaults.

5. Config defaults

   Global, instance and request-level default configuration and precedence.

6. Interceptors

   Intercepting requests and responses to add auth headers, logging or retries.

7. Handling errors

   AxiosError, validateStatus, and distinguishing network errors from HTTP errors.

8. Cancellation

   Aborting requests with AbortController and cancel tokens.

9. Multipart and form data

   Posting FormData and multipart/form-data, including file uploads.

10. URL-encoded bodies

    Sending application/x-www-form-urlencoded data in browsers and Node.js.

11. Making POST requests and JSON

    Sending JSON and form bodies with POST, PUT and PATCH.

12. Migration guide

    Upgrading between Axios major versions and breaking changes.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.