> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# HSET

> Set hash field values.

Use `HSET` to set one or more fields of a hash to the given values, creating the key when it does not exist.

Existing fields are overwritten, and the reply counts only the fields that were added, not those that were updated, which is how you tell an insert from an update. Setting fields does not touch the key's time to live, so a hash with an expiration keeps it as it is written to. A field's own expiration is a different matter: writing a field clears the TTL it may have been given by [`HEXPIRE`](/docs/redis/commands/hash/hexpire) or [`HSETEX`](/docs/redis/commands/hash/hsetex).

Hashes are the compact way to store an object under one key: field access with `HSET` and [`HGET`](/docs/redis/commands/hash/hget) avoids reading and rewriting the whole value the way a serialized string would.

## Syntax

```redis theme={"system"}
HSET <key> <field> <value> [<field> <value> ...]
```

## Arguments

| Argument          | Required | Repeatable | Description                                                                   |
| ----------------- | -------- | ---------- | ----------------------------------------------------------------------------- |
| `<key>`           | Yes      | No         | Redis key targeted by the command.                                            |
| `<field> <value>` | Yes      | Yes        | Field and the value to store in it. Repeat to set several fields in one call. |

## Response

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.

| Protocol | Reply   |
| -------- | ------- |
| RESP2    | Integer |
| RESP3    | Integer |

<Note>
  Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.
</Note>

## Examples

TCP examples use the TLS `REDIS_URL` from the Upstash console. REST examples use `UPSTASH_REDIS_REST_URL` and `UPSTASH_REDIS_REST_TOKEN`.

<AccordionGroup>
  <Accordion title="Redis CLI" icon="terminal">
    ```bash theme={"system"}
    HSET my-key field value
    ```
  </Accordion>

  <Accordion title="@upstash/redis" icon="node-js" iconType="brands">
    ```ts theme={"system"}
    import { Redis } from "@upstash/redis";

    const redis = Redis.fromEnv();

    await redis.hset("key", {
      id: 1,
      username: "chronark",
      name: "andreas"
      });
    ```
  </Accordion>

  <Accordion title="upstash_redis" icon="python" iconType="brands">
    ```python theme={"system"}
    from upstash_redis import Redis

    redis = Redis.from_env()
    result = redis.hset("my-key", "field", "value")
    print(result)
    ```
  </Accordion>

  <Accordion title="ioredis" icon="node-js" iconType="brands">
    ```ts theme={"system"}
    import Redis from "ioredis";

    const redis = new Redis(process.env.REDIS_URL!);
    const result = await redis.hset("my-key", "field", "value");
    console.log(result);
    ```
  </Accordion>

  <Accordion title="node-redis" icon="node-js" iconType="brands">
    ```ts theme={"system"}
    import { createClient } from "redis";

    const client = await createClient({ url: process.env.REDIS_URL })
      .on("error", console.error)
      .connect();
    const result = await client.hSet("my-key", "field", "value");
    console.log(result);
    ```
  </Accordion>

  <Accordion title="redis-py" icon="python" iconType="brands">
    ```python theme={"system"}
    import os
    import redis

    client = redis.from_url(os.environ["REDIS_URL"])
    result = client.hset("my-key", "field", "value")
    print(result)
    ```
  </Accordion>

  <Accordion title="go-redis" icon="golang" iconType="brands">
    ```go theme={"system"}
    package main

    import (
        "context"
        "fmt"
        "os"

        "github.com/redis/go-redis/v9"
    )

    func main() {
        opts, err := redis.ParseURL(os.Getenv("REDIS_URL"))
        if err != nil {
            panic(err)
        }
        client := redis.NewClient(opts)
        result, err := client.HSet(context.Background(), "my-key", "field", "value").Result()
        if err != nil {
            panic(err)
        }
        fmt.Println(result)
    }
    ```
  </Accordion>

  <Accordion title="jedis" icon="java" iconType="brands">
    ```java theme={"system"}
    import java.net.URI;

    import redis.clients.jedis.Jedis;

    try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {
      Object result = jedis.hset("my-key", "field", "value");
      System.out.println(result);
    }
    ```
  </Accordion>

  <Accordion title="redis-rs" icon="rust" iconType="brands">
    ```rust theme={"system"}
    use redis::TypedCommands;

    fn main() -> redis::RedisResult<()> {
        let url = std::env::var("REDIS_URL").expect("REDIS_URL is not set");
        let client = redis::Client::open(url)?;
        let mut connection = client.get_connection()?;

        let result = connection.hset("my-key", "field", "value")?;
        println!("{result:?}");
        Ok(())
    }
    ```
  </Accordion>
</AccordionGroup>


## Related topics

- [HSET](/docs/redis/sdks/py/commands/hash/hset.md)
- [HSETNX](/docs/redis/commands/hash/hsetnx.md)
- [HSETEX](/docs/redis/commands/hash/hsetex.md)