javascript - 如何在 JavaScript Node.js 中将 Buffer 数据类型转换为 Base64

Question

我有这个模型代码:

// ...
var account = {
    picture: function(account_id, callback) {
        return db.query("SELECT image_profile FROM account_info WHERE account_info_id=?", [account_id], callback);
    }
};
//...

这是针对路由器的:

// ...
router.post('/picture/:id?', function(req, res, next) {
    account.picture(req.params.id, function(err, rows) {
        if (err) {
            res.json({ 'success': false });
        } else {
            res.json(rows);
        }
    });
});
// ...

所以输出的JSON格式是这样的:

[
  {
    "image_profile": {
      "type": "Buffer",
      "data": [
        255,
        216,
        255,
        224,
        0,// ... too long cause this is BLOB file from database

如何将 JSON 上的“数据”转换为 Base64？

Answer 1

我最近遇到了这个错误并从前端解决了它。

const profile = {"type": "Buffer", "data": [255, 216, ...]};
const profileStr = JSON.stringify(profile);
const profile64 = new Buffer(profileStr).toString("base64");

// $('#img').attr('src', "data:image/png;base64," + profile64);