NodeJS/JS How to correctly hash object json and string (concatenation) via sha256

Question

Good morning,
I want to hash object params and string (concatenation) via sha256., but I do not know how to do it correctly.
My object:

var params = {
   "name": "kacper",
   "age": 23
};
var string = "string to hash";

I used for it library sha256 from npm, but my encode hash is incorectly.
Attempt hash:

var sha256 = require('sha256');
var hashing = sha256(params+stirng);
console.log(hashing);

Thans for yours help.

Bary12 · Accepted Answer · 2018-01-20 11:36:47Z

1

Let's first understand what params+string does exactly. params is converted into a string, resulting in [object Object]. Then your final string is [object Object]string to hash.

Instead, you might want to get the entire params object as a string. This can be done with JSON.stringify.

console.log(JSON.stringify(params) + string);

the result is then {"name":"kacper","age":23}string to hash.

Is this what you were looking for? It might be a better practice to make an object with params and string as fields.

var obj = {
  "params": {
    "name": "kacper",
    "age": 23
  },
  "string": "string to hash"
}

console.log(sha256(JSON.stringify(obj)));

answered Jan 20, 2018 at 11:36

Bary12

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2 Comments

Kaker Over a year ago

thanks for reply but it does not finish this solution is good, its not working for me, I need to hash this exactly: "Hash SHA256 with concatenation of all post values and private key",it looks like it's good: sha256(JSON.stringify(params) + string), but not working,

Bary12 Over a year ago

maybe it means to concatenate all the values in the object params? i.e. sha256(params.name + params.age)?

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