> ## Documentation index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Ask it with GET https://upstash.com/docs/ask?q=<keywords or question>. Short keywords rank best.
> Use these to discover all available pages before exploring further.
> Feature requests: https://upstash.com/docs/common/help/feature-requests.md lists what users asked for and how to vote for a request or add one.
> Page rating: `GET https://upstash.com/docs/feedback?path=/docs/redis/sdks/ts/commands/hash/hlen&helpful=true` (or `false`) records whether this page helped. An optional `comment` (URL-encoded, at most 500 characters) says what was missing or wrong. It is anonymous and needs no key. Comments hold no code, secrets or personal data.

# HLEN

> Returns the number of fields contained in the hash stored at key.

## Arguments

<ParamField body="key" type="string" required>
  The key of the hash.
</ParamField>

## Response

<ResponseField type="integer" required>
  How many fields are in the hash.
</ResponseField>

<RequestExample>
```ts Example
await redis.hset("key", {
  id: 1,
  username: "chronark",
  });
const fields = await redis.hlen("key");
console.log(fields); // 2
```
</RequestExample>