24 lines
818 B
Markdown
24 lines
818 B
Markdown
---
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title: hashBrowser
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tags: browser,advanced,promise,advanced
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---
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Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise.
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- Use the [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) API to create a hash for the given value.
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```js
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const hashBrowser = val =>
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crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(val)).then(h => {
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let hexes = [],
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view = new DataView(h);
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for (let i = 0; i < view.byteLength; i += 4)
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hexes.push(('00000000' + view.getUint32(i).toString(16)).slice(-8));
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return hexes.join('');
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});
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```
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```js
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hashBrowser(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(console.log); // '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'
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```
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