30 lines
775 B
Markdown
30 lines
775 B
Markdown
---
|
|
title: hashNode
|
|
tags: node,promise,intermediate
|
|
---
|
|
|
|
Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise.
|
|
|
|
Use `crypto` API to create a hash for the given value, `setTimeout` to prevent blocking on a long operation, and a `Promise` to give it a familiar interface.
|
|
|
|
```js
|
|
const crypto = require('crypto');
|
|
const hashNode = val =>
|
|
new Promise(resolve =>
|
|
setTimeout(
|
|
() =>
|
|
resolve(
|
|
crypto
|
|
.createHash('sha256')
|
|
.update(val)
|
|
.digest('hex')
|
|
),
|
|
0
|
|
)
|
|
);
|
|
```
|
|
|
|
```js
|
|
hashNode(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(console.log); // '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'
|
|
```
|