Javascript from Buffer to JSON

问题

I'm using bleno (A node js BLE package) and it uses Buffer to send and receive data. How will I go about getting a Buffer object and converting it into JSON? This is what i have now:

bufferToJson = buffer.toString();
bufferToJson = JSON.stringify(bufferToJson)
bufferToJson = JSON.parse(bufferToJson)

buffer is where the data is. An example of what buffer can be is {cmd:'echo'} I have tried bufferToJson.cmd and only get undefine. Thanks.

回答1:

If your buffer object contains a valid representation of a JSON, then the easiest way to convert it would be like so:

const json = JSON.parse(buffer);

回答2:

Following should work:

var bufferToJson = JSON.parse(myBuffer.toString());

回答3:

You can use TextDecoder as in following fragment:

const buffer = await characteristic.readValue();
const decoder = new TextDecoder('utf8');
const text = decoder.decode(buffer);
console.log(JSON.parse(text));

回答4:

For nodejs apps, I found String Decoder to work out great.

https://nodejs.org/api/string_decoder.html

// API for decoding Buffer objects into strings
const { StringDecoder } = require('string_decoder');
const decoder = new StringDecoder('utf8');

let body = Buffer.from(response.body);
let json = decoder.write(body);
let foo  = JSON.parse(json);

来源：https://stackoverflow.com/questions/40120232/javascript-from-buffer-to-json