How to Format Base64 Encoded String While Sending in Json

Attach image and send it via json in base64 encoding

Updating the answer based on comment. you can refer to the example on sandbox

Please add create a promise to avoid callback hell. Here I have promised the base46 Function. Promisification

const getBase64Promise = function (file) {
  return new Promise((resolve, reject) => {
    getBase64(file, (success,err) => {
        if(err) reject(err)
        else resolve(success);
    });
  });
};

Like this

async function construct_json(form, callback) {
  let data = await getBase64Promise(form.get("picture"));
    let json = {
      picture: data
    };
    return json;
}

Node JS, How to properly store Base64 String in JSON string?

Your approach is good, Base64 strings cannot have backslashes in them, and the rest will be escaped.

Base64 index Table :

0   A   16  Q   32  g   48  w
1   B   17  R   33  h   49  x
2   C   18  S   34  i   50  y
3   D   19  T   35  j   51  z
4   E   20  U   36  k   52  0
5   F   21  V   37  l   53  1
6   G   22  W   38  m   54  2
7   H   23  X   39  n   55  3
8   I   24  Y   40  o   56  4
9   J   25  Z   41  p   57  5
10  K   26  a   42  q   58  6
11  L   27  b   43  r   59  7
12  M   28  c   44  s   60  8
13  N   29  d   45  t   61  9
14  O   30  e   46  u   62  +
15  P   31  f   47  v   63  /

and with the given string, it works perfectly :

a={"password":"123456",key:"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"}

Looking at your screencap, it looks like you have a newline in your String, could that be the case? I'm at a loss here : http://prnt.sc/ddyq6y

Convert base64 string to JSON .NET

You have a base-64 string, and you seem to what a deserialized object; so you'll need multiple steps:

• decode the base-64 to binary
• interpret the binary as text
• define an object model that matches the expected data
• deserialize the text as the object model

For example:

    static void Main()
    {
        var base64 = @"e0tleSA6ICdhYmMnLCBpc0V4aXN0czogJ3RydWUnfQ==";
        var blob = Convert.FromBase64String(base64);
        var json = Encoding.UTF8.GetString(blob);
        // string: "{Key : 'abc', isExists: 'true'}"
 
        var obj = JsonConvert.DeserializeObject<MyPayload>(json);
        Console.WriteLine(obj.Key);
        Console.WriteLine(obj.IsExists);
    }

    class MyPayload
    {
        public bool IsExists { get; set; }
        public string Key { get; set; }
    }

Base64 encode a javascript object

You misunderstood the Buffer(str, [encoding]) constructor, the encoding tells the constructor what encoding was used to create str, or what encoding the constructor should use to decode str into a byte array.

Basically the Buffer class represents byte streams, it's only when you convert it from/to strings that encoding comes into context.

You should instead use buffer.toString("base64") to get base-64 encoded of the buffer content.

let objJsonStr = JSON.stringify(obj);
let objJsonB64 = Buffer.from(objJsonStr).toString("base64");

Serialize in JSON a base64 encoded data

You must be careful about the datatypes.

If you read a binary image, you get bytes.
If you encode these bytes in base64, you get ... bytes again! (see documentation on b64encode)

json can't handle raw bytes, that's why you get the error.

I have just written some example, with comments, I hope it helps:

from base64 import b64encode
from json import dumps

ENCODING = 'utf-8'
IMAGE_NAME = 'spam.jpg'
JSON_NAME = 'output.json'

# first: reading the binary stuff
# note the 'rb' flag
# result: bytes
with open(IMAGE_NAME, 'rb') as open_file:
    byte_content = open_file.read()

# second: base64 encode read data
# result: bytes (again)
base64_bytes = b64encode(byte_content)

# third: decode these bytes to text
# result: string (in utf-8)
base64_string = base64_bytes.decode(ENCODING)

# optional: doing stuff with the data
# result here: some dict
raw_data = {IMAGE_NAME: base64_string}

# now: encoding the data to json
# result: string
json_data = dumps(raw_data, indent=2)

# finally: writing the json string to disk
# note the 'w' flag, no 'b' needed as we deal with text here
with open(JSON_NAME, 'w') as another_open_file:
    another_open_file.write(json_data)

Send Base64 with JSONObject to server(ANDROID)

Do this in your PHP file

1. Make a Json String from posted data (base64), and remove "\n" character (to avoid that character)
2. Decode that JSON String to remove that JSON Character
3. Get the decoded string

This is work for me

$img_base64 = $_POST['ArchivoTexto'];
$sdata = '{"val" : "'.sub_str("\n","",$img_base64).'"}';

$ddata = json_decode($sdata);

$jdata = $ddata->val;//$jdata contain the clear base64 String

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