Test & Debug JSON APIs in Your Browser JSON API Tester tool for network operations.

Under the hood, it utilizes client-side JavaScript and browser APIs to send HTTP requests to API endpoints. The `fetch` API is used to make these requests, allowing control over the request method, headers, and body. When a user submits a request, the tool constructs a `RequestInit` object with the specified options, including the chosen HTTP method from the `SelectWithHelp` component. If the user has entered a JSON payload in the request body field, it is sent along with the request; otherwise, the body remains empty.

The response from the API endpoint is then processed and displayed to the user. The tool uses the `JSON.parse` function to attempt to parse the response text as JSON, and if successful, it pretty-prints the result using `JSON.stringify` with an indentation of 2 spaces. If parsing fails, the raw response text is displayed instead. The response headers are also collected from the `Response` object returned by `fetch`, and made available for viewing in a collapsible details section.

In terms of state management, it employs ES6+ features such as destructuring and arrow functions, along with React hooks like `useState` and `useCallback`. These hooks enable efficient updates to the component's state when user input changes or a request is sent. The tool also incorporates mobile-first responsive design principles to ensure usability across different devices and screen sizes.

Error handling is implemented using try-catch blocks, catching any exceptions that occur during the request or response processing phases. If an error occurs due to CORS restrictions or other issues, an informative error message is displayed to the user, providing context about what went wrong. The `copyToClipboard` function from the `@/lib/utils` module is used to enable users to copy the response data to their clipboard for further use or sharing.

The tool's input validation mechanism checks for edge cases such as empty URLs or invalid JSON payloads, ensuring that only valid requests are sent to API endpoints. By following relevant standards and RFCs, it ensures compatibility with a wide range of APIs and HTTP servers. Overall, its design and implementation prioritize usability, efficiency, and accuracy in testing and debugging JSON APIs directly within the browser.