xgqfrms/node.js-charset-utf-8.md

## node.js-charset-utf-8.md

      
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              node.js-charset-utf-8.md
            
          
    for who use the express.js server


UTF-8

Node.js Express.js  charset UTF-8


charset=utf-8

'CharacterEncoding': 'UTF-8'
app.get('/sse', (req, res) => {
  res.writeHead(200, {
    // 'Content-Type': 'image/jpg',
    // 'Content-Type': 'image/png',
    // 'Content-Type': 'application/json',
    // 'Content-Type': 'text/event-stream',
    'Content-Type': 'text/event-stream; charset=utf-8',
    'Cache-Control': 'no-cache',
    'Connection': 'keep-alive',
    // 'Access-Control-Allow-Origin': "*",
    // 'CharacterEncoding': 'UTF-8',
    // 'Accept-Encoding': 'UTF-8',
  });
  // response.setContentType("text/event-stream");
  // response.setCharacterEncoding("UTF-8");
  let i = 0;
  let uid = setInterval(() => {
    console.log(`i`, i);
    if(i < 10) {
      i++;
      const data = convertImageToBase64URL("./public/test.png");
      console.log(`SSE ${i}`, data.slice(0, 100));
      // ❌
      // res.write(data);
      // event id `lastEventId` ✅
      const id = 2023;
      res.write(`id: ${id}\n`);
      // event type `message` \n
      // event data `data` \n\n
      // res.write(`event: message\n`);
      // custom event type `custom_message`\n ✅
      res.write(`event: custom_event_message\n`);
      res.write(`data: ${data}\n\n`);
    } else {
      clearInterval(uid);
    }
  }, 3000);
});
// http://localhost:3000/sse


![image](https://github.com/nodejs/node/assets/7291672/24775c3b-bd27-412b-b955-933722a3079d)

![](https://user-images.githubusercontent.com/7291672/277396988-24775c3b-bd27-412b-b955-933722a3079d.png)

refs

nodejs/node#17390 (comment)
https://stackoverflow.com/questions/17872789/node-js-express-how-do-i-set-response-character-encoding