Getting Started with ReductStore in Node.js
Tags: javascript, node, reductstore, learning
Published: 2024-06-21 03:48:29


This quick start guide will walk you through the process of installing and using the [**ReductStore JavaScript Client SDK**](https://github.com/reductstore/reduct-js) to read and write data to a [**ReductStore**](https://www.reduct.store/) instance.

## Installing the JavaScript SDK

To install the SDK, you will only need `npm` or `yarn`. You can install the SDK by using the following command:

```
npm install reduct-js
```

## Running ReductStore[](https://www.reduct.store/docs/getting-started/with-javascript#running-reductstore)

If you don't already have a ReductStore instance running, you can easily spin up one as a Docker container. To do this, run the following command:

```
docker run -p 8383:8383 -e RS_API_TOKEN="my-token" reduct/store:latest
```

This will start a ReductStore instance listening on port 8383 on your local machine. The `RS_API_TOKEN` environment variable is used to authenticate requests to the ReductStore instance. You can set it to any value you like, but you will need to use the same value when creating a `Client` object in your code.

If Docker is not an option, you can also download the ReductStore binaries. Check the [**Download Page**](https://www.reduct.store/download).

## Hello World Example

Now when you have the SDK installed and a ReductStore instance running, you can start using the SDK to interact with the ReductStore database. Here is an example of using the SDK to perform basic operations on a ReductStore instance:

```jsx
import {Client, QuotaType} from "reduct-js"

// 1. Create a ReductStore client
const client = new Client("http://127.0.0.1:8383", {
    apiToken: "my-token",
});

// 2. Get or create a bucket with 1Gb quota
const bucket = await client.getOrCreateBucket("my-bucket", {
    quotaType: QuotaType.FIFO,
    quotaSize: BigInt(1e9),
});

// 3. Write some data with timestamps in the 'sensor-1' entry
const us = (dateString) => BigInt(Date.parse(dateString) * 1000);
let record = await bucket.beginWrite("sensor-1", us("2021-01-01T00:00:00Z"));
await record.write("Record #1");
record = await bucket.beginWrite("sensor-1", us("2021-01-01T00:00:01Z"));
await record.write("Record #2");

// 4. Query the data by time range
for await (const record of bucket.query("sensor-1",
    us("2021-01-01T00:00:00Z"),
    us("2021-01-01T00:00:02Z"))) {

    console.log(`Record timestamp: ${record.timestamp}`);
    console.log(`Record size: ${record.size}`);
    console.log(await record.readAsString());
}
```

Let's break down what this example is doing.

## Creating a Client

Before you can interact with a ReductStore instance, you must create a `Client` object that represents a connection to the ReductStore instance.

To create the client, you can use the `Client` class from the `reduct-js` package. Pass the URL of the ReductStore instance you want to connect to as an argument to the `Client` constructor.

```jsx
const client = new Client("http://127.0.0.1:8383", {
    apiToken: "my-token",
});
```

## Creating a Bucket

ReductStore organizes data into buckets, each of which has its own quota and settings. It's a necessary step to create a bucket before writing data to it. You can read more about buckets in the [**Buckets Guide**](https://www.reduct.store/docs/guides/buckets), but for now, let's just create one.

To create a bucket, you should use the `getOrCreateBucket` method on a `Client` instance. Pass the name of the bucket you want to create as an argument, along with settings. If the bucket already exists, the `getOrCreateBucket` method will return it.

```jsx
const bucket = await client.getOrCreateBucket("my-bucket", {
    quotaType: QuotaType.FIFO,
    quotaSize: BigInt(1e9),
});

```

In this example we create a bucket with a FIFO quota of 1GB. This means that the oldest data will be deleted when the bucket reaches 1GB.

## Data Ingestion

Time series data is stored in entries within a bucket. An entry is a collection of records with unique timestamps. It must have a unique name within the bucket and usually represents a data source, such as [**a vibration sensor**](https://www.reduct.store/use-cases/vibration-sensors) or [**a CV camera**](https://www.reduct.store/blog/tutorials/computer-vision/3-ways-stora-data-for-computer-vision-applications).

To write a timestamped record to an entry in a bucket, you should use the `beginWrite` method on a `Bucket` object. Pass the name of the entry you want to write to as an argument, along with the data and timestamp you want to write. The `beginWrite` method will create the `sensor-1` entry if it doesn't exist and return a `WritableRecord` object. The `WritableRecord` object can be used to send the data to the database.

```jsx
const us = (dateString) => BigInt(Date.parse(dateString) * 1000);
let record = await bucket.beginWrite("sensor-1", us("2021-01-01T00:00:00Z"));
await record.write("Record #1");
record = await bucket.beginWrite("sensor-1", us("2021-01-01T00:00:01Z"));
await record.write("Record #2");
```

Pay attention that the time is a UNIX time in microseconds. This the reason why we use BigInt to represent it.

This is the simplest case of writing data using the Python SDK. You can also write data in chunks and annotate records with labels. You can find more information and examples in the [**Data Ingestion Guide**](https://www.reduct.store/docs/guides/data-ingestion).

## Data Querying

Usually, we don't read a particular record by its timestamp, but query records in a time range.

To iterate over all records in a given time range, you should use the `query` method on a bucket instance. Pass the name of the entry to iterate over, and `start` and `stop` arguments to specify the time interval. The `query` method returns an async iterator over the records in the entry:

```jsx
for await (const record of bucket.query("sensor-1",
    us("2021-01-01T00:00:00Z"),
    us("2021-01-01T00:00:02Z"))) {

    console.log(`Record timestamp: ${record.timestamp}`);
    console.log(`Record size: ${record.size}`);
    console.log(await record.readAsString());
}
```

The query method has many parameters for filtering and returning sample records. For more information and examples, see the [**Data Querying Guide**](https://www.reduct.store/docs/guides/data-querying).

## Next Steps

As you can see to get started with the Client SDK is very easy. However,it doesn't cover all the features of the SDK and the database. Check our [**Guides**](https://www.reduct.store/docs/next/guides) to learn more about the ReductStore features and how to use them.