How to convert Buffer array to hex?

Question

I am getting a Buffer array back in a JSON object when I call one of my API endpoints. I would like to convert this array to a more "usable" form (hex?) so I can compare them, etc. Here is what the object currently looks like:

"hash": {
  "type": "Buffer",
  "data": [
    151,
    14,
    51,
    26,
    46,
    52,
    5,
    151,
    99,
    107,
    38,
    188,
    138,
    180,
    76,
    56,
    108,
    214,
    135,
    213,
    125,
    134,
    105,
    139,
    129,
    236,
    206,
    157,
    67,
    1,
    12,
    12
  ]
}

How would I go about converting this array to a hex (or string, etc.) so that I can compare hashes?

Bernie · Accepted Answer · 2015-12-09 15:38:52Z

2

You can just create a new buffer and convert it into the format you need.

var o = {"hash": {
"type": "Buffer",
"data": [
  151,
  14,
  51,
  26,
  46,
  52,
  5,
  151,
  99,
  107,
  38,
  188,
  138,
  180,
  76,
  56,
  108,
  214,
  135,
  213,
  125,
  134,
  105,
  139,
  129,
  236,
  206,
  157,
  67,
  1,
  12,
  12
  ]
 }
}

console.log(new Buffer(o.hash,'hex').toString('hex'));
// 970e331a2e340597636b26bc8ab44c386cd687d57d86698b81ecce9d43010c0c

answered Dec 9, 2015 at 15:38

Bernie

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Comments

rcoup · Accepted Answer · 2019-02-12 23:36:12Z

2

If you have an existing Buffer object, you can represent it as hex via:

myBuffer.toString('hex')
// '970e331a2e340597636b26bc8ab44c386cd687d57d86698b81ecce9d43010c0c'

answered Feb 12, 2019 at 23:36

rcoup

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Comments

BeyelerStudios · Accepted Answer · 2015-12-09 15:23:21Z

0

Use Number.prototype.toString:

var json = '{"hash": {"type": "Buffer","data": [151,14,51]}}';
var parsed = JSON.parse(json);
document.write("data: " + JSON.stringify(parsed.hash.data) + "<br>");
document.write("hex: ");
parsed.hash.data.forEach(function(b) { document.write(("00" + b.toString(16)).substr(-2)); });

answered Dec 9, 2015 at 15:23

BeyelerStudios

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