Easy as 🦆:

You can try following scripts directly in your browser's console.

POST request

Performing a POST request is a simple way to receive the evaluation. However, it is less reactive than WS since server needs to "get" to the requested depth until it sends back the response.

// 1. Create a handy function for sending requests:
async function postChessApi(data = {}) {
    const response = await fetch("https://chess-api.com/v1", {
        method: "POST",
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify(data),
    });
    return response.json();
}

// 2. Execute:
postChessApi({ fen: "8/1P1R4/n1r2B2/3Pp3/1k4P1/6K1/Bppr1P2/2q5 w - - 0 1" }).then((data) => {
    console.log(data);
});

// 3. You can provide text/html input to parse:
postChessApi({ input: document.querySelector('.moves-list').outerHTML }).then((data) => {
    console.log(data);
});
				

WebSockets

WebSocket connetion allows you to receive moves in progressive manner.

// 1. Open WebSocket connection:
ws = new WebSocket('wss://chess-api.com/v1');

// 2. Register callback to Log every incomming message in the console:
ws.onmessage = (event) => {
    const chessApiMessage = JSON.parse(event.data);
    console.log(chessApiMessage);
};

// 3. After connection is estabilished, send me a message:
ws.send(JSON.stringify({ 
    fen: '8/1P1R4/n1r2B2/3Pp3/1k4P1/6K1/Bppr1P2/2q5 w - - 0 1',
    variants: 3
}));

// 4. You can also ask me to figure out position myself by sending text or HTML with moves list. My parsers will try to do their best.
ws.send(JSON.stringify({ 
    input: `<div ...`,
    variants: 3
}));