Problem

I am using the Lichess API where it is stated under Get Export games of a user that the query parameter max is of type integer and can be set >= 1.

In the following snippet of code I am not able to fetch data with max larger than 1, but it works for max=1. It also does not work in this identical JSFiddle, nor in my VsCode project. They work only if I set the query max to the value 1.

new Vue({
  el: "#app",
  data: {
    temp: 1
  },
  methods: {
    async fetchData() {
        const response = await fetch(
         `https://lichess.org/api/games/user/Thibault?max=2&rated=false`, 
         {headers:{
            Accept:'application/x-ndjson'
          }}
      );
      const data = await response.json();
      console.log(data);
    },
  }
})

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app">
   <button @click="fetchData()"> fetch data</button>
</div>

Things I have tried

I have tried using async await, and removing them but with no success, I have tried to search online for solutions and read the API documentation thoroughly but it just doesn't work.

the Network devtools says the content-type is x-ndjson so I set application/x-ndjson in my header tag (solving another first problem I had before).

Does anyone know what is going on?

CodePudding user response：

Coming data format is nd-json and Lichess API offers a utility function to help reading NDJSON streamed responses.

If you use this, you will get the data:

new Vue({
  el: "#app",
  data: {
    temp: 1
  },
  methods: {
    async fetchData() {
      const response = await fetch(
         `https://lichess.org/api/games/user/Thibault?max=2&rated=false`, 
         {headers:{
            Accept:'application/x-ndjson'
          }}
      ).then(readStream(onMessage))
       .then(onComplete);

      console.log(arr);
    },
  }
})

const readStream = processLine => response => {
  const stream = response.body.getReader();
  const matcher = /\r?\n/;
  const decoder = new TextDecoder();
  let buf = '';

  const loop = () =>
    stream.read().then(({ done, value }) => {
      if (done) {
        if (buf.length > 0) processLine(JSON.parse(buf));
      } else {
        const chunk = decoder.decode(value, {
          stream: true
        });
        buf  = chunk;

        const parts = buf.split(matcher);
        buf = parts.pop();
        for (const i of parts.filter(p => p)) processLine(JSON.parse(i));
        return loop();
      }
    });

  return loop();
}
const arr = [];
const onMessage = obj => arr.push(obj);
const onComplete = () => console.log('The stream has completed');