@basis-theory/node-sdk

BasisTheory TypeScript Library

The BasisTheory TypeScript library provides convenient access to the BasisTheory APIs from TypeScript.

Table of Contents

• Documentation
• Installation
• Reference
• Usage
• Environments
• Request and Response Types
• Exception Handling
• Pagination
• Advanced
  • Subpackage Exports
  • Additional Headers
  • Additional Query String Parameters
  • Retries
  • Timeouts
  • Aborting Requests
  • Access Raw Response Data
  • Logging
  • Custom Fetch
  • Custom Fetcher
  • Runtime Compatibility
• Contributing
• File Uploads
• Binary Response

Documentation

API reference documentation is available here.

Installation

npm i -s @basis-theory/node-sdk

Reference

A full reference for this library is available here.

Usage

Instantiate and use the client with the following:

import { BasisTheoryClient } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({ apiKey: "YOUR_API_KEY", correlationId: "YOUR_CORRELATION_ID" });
await client.tenants.self.get();

Environments

This SDK allows you to configure different environments for API requests.

import { BasisTheoryClient, BasisTheoryEnvironment } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({
    environment: BasisTheoryEnvironment.Default,
});

Request and Response Types

The SDK exports all request and response types as TypeScript interfaces. Simply import them with the following namespace:

import { BasisTheory } from "@basis-theory/node-sdk";

const request: BasisTheory.ApplicationsListRequest = {
    ...
};

Exception Handling

When the API returns a non-success status code (4xx or 5xx response), a subclass of the following error will be thrown.

import { BasisTheoryError } from "@basis-theory/node-sdk";

try {
    await client.tenants.self.get(...);
} catch (err) {
    if (err instanceof BasisTheoryError) {
        console.log(err.statusCode);
        console.log(err.message);
        console.log(err.body);
        console.log(err.rawResponse);
    }
}

Pagination

List endpoints are paginated. The SDK provides an iterator so that you can simply loop over the items:

import { BasisTheoryClient } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({ apiKey: "YOUR_API_KEY", correlationId: "YOUR_CORRELATION_ID" });
const pageableResponse = await client.applications.list({
    id: ["id"],
    type: ["type"],
    page: 1,
    start: "start",
    size: 1
});
for await (const item of pageableResponse) {
    console.log(item);
}

// Or you can manually iterate page-by-page
let page = await client.applications.list({
    id: ["id"],
    type: ["type"],
    page: 1,
    start: "start",
    size: 1
});
while (page.hasNextPage()) {
    page = page.getNextPage();
}

// You can also access the underlying response
const response = page.response;

Advanced

Subpackage Exports

This SDK supports direct imports of subpackage clients, which allows JavaScript bundlers to tree-shake and include only the imported subpackage code. This results in much smaller bundle sizes.

import { ApplicationsClient } from '@basis-theory/node-sdk/applications';

const client = new ApplicationsClient({...});

Additional Headers

If you would like to send additional headers as part of the request, use the headers request option.

import { BasisTheoryClient } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({
    ...
    headers: {
        'X-Custom-Header': 'custom value'
    }
});

const response = await client.tenants.self.get(..., {
    headers: {
        'X-Custom-Header': 'custom value'
    }
});

Additional Query String Parameters

If you would like to send additional query string parameters as part of the request, use the queryParams request option.

const response = await client.tenants.self.get(..., {
    queryParams: {
        'customQueryParamKey': 'custom query param value'
    }
});

Retries

The SDK is instrumented with automatic retries with exponential backoff. A request will be retried as long as the request is deemed retryable and the number of retry attempts has not grown larger than the configured retry limit (default: 2).

Which status codes are retried depends on the retryStatusCodes generator configuration:

legacy (current default): retries on

• 408 (Timeout)
• 429 (Too Many Requests)
• 5XX (All server errors, including 500)

recommended: retries on

• 408 (Timeout)
• 429 (Too Many Requests)
• 502 (Bad Gateway)
• 503 (Service Unavailable)
• 504 (Gateway Timeout)

Use the maxRetries request option to configure this behavior.

const response = await client.tenants.self.get(..., {
    maxRetries: 0 // override maxRetries at the request level
});

Timeouts

The SDK defaults to a 60 second timeout. Use the timeoutInSeconds option to configure this behavior.

const response = await client.tenants.self.get(..., {
    timeoutInSeconds: 30 // override timeout to 30s
});

Aborting Requests

The SDK allows users to abort requests at any point by passing in an abort signal.

const controller = new AbortController();
const response = await client.tenants.self.get(..., {
    abortSignal: controller.signal
});
controller.abort(); // aborts the request

Access Raw Response Data

The SDK provides access to raw response data, including headers, through the .withRawResponse() method. The .withRawResponse() method returns a promise that results to an object with a data and a rawResponse property.

const { data, rawResponse } = await client.tenants.self.get(...).withRawResponse();

console.log(data);
console.log(rawResponse.headers['X-My-Header']);

Logging

The SDK supports logging. You can configure the logger by passing in a logging object to the client options.

import { BasisTheoryClient, logging } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({
    ...
    logging: {
        level: logging.LogLevel.Debug, // defaults to logging.LogLevel.Info
        logger: new logging.ConsoleLogger(), // defaults to ConsoleLogger
        silent: false, // defaults to true, set to false to enable logging
    }
});

The logging object can have the following properties:

• level: The log level to use. Defaults to logging.LogLevel.Info.
• logger: The logger to use. Defaults to a logging.ConsoleLogger.
• silent: Whether to silence the logger. Defaults to true.

The level property can be one of the following values:

• logging.LogLevel.Debug
• logging.LogLevel.Info
• logging.LogLevel.Warn
• logging.LogLevel.Error

To provide a custom logger, you can pass in an object that implements the logging.ILogger interface.

Custom logger examples

Here's an example using the popular winston logging library.

import winston from 'winston';

const winstonLogger = winston.createLogger({...});

const logger: logging.ILogger = {
    debug: (msg, ...args) => winstonLogger.debug(msg, ...args),
    info: (msg, ...args) => winstonLogger.info(msg, ...args),
    warn: (msg, ...args) => winstonLogger.warn(msg, ...args),
    error: (msg, ...args) => winstonLogger.error(msg, ...args),
};

Here's an example using the popular pino logging library.

import pino from 'pino';

const pinoLogger = pino({...});

const logger: logging.ILogger = {
  debug: (msg, ...args) => pinoLogger.debug(args, msg),
  info: (msg, ...args) => pinoLogger.info(args, msg),
  warn: (msg, ...args) => pinoLogger.warn(args, msg),
  error: (msg, ...args) => pinoLogger.error(args, msg),
};

Custom Fetch

The SDK provides a low-level fetch method for making custom HTTP requests while still benefiting from SDK-level configuration like authentication, retries, timeouts, and logging. This is useful for calling API endpoints not yet supported in the SDK.

const response = await client.fetch("/v1/custom/endpoint", {
    method: "GET",
}, {
    timeoutInSeconds: 30,
    maxRetries: 3,
    headers: {
        "X-Custom-Header": "custom-value",
    },
});

const data = await response.json();

Custom Fetcher

The SDK provides a way for you to customize the underlying HTTP client / Fetch function. If you're running in an unsupported environment, this provides a way for you to break glass and ensure the SDK works.

import { BasisTheoryClient } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({
    ...
    fetcher: // provide your implementation here
});

Runtime Compatibility

The SDK works in the following runtimes:

• Node.js 18+
• Vercel
• Cloudflare Workers
• Deno v1.25+
• Bun 1.0+
• React Native

Contributing

While we value open-source contributions to this SDK, this library is generated programmatically. Additions made directly to this library would have to be moved over to our generation code, otherwise they would be overwritten upon the next generated release. Feel free to open a PR as a proof of concept, but know that we will not be able to merge it as-is. We suggest opening an issue first to discuss with us!

On the other hand, contributions to the README are always very welcome!

File Uploads

You can upload files using the client:

import { createReadStream } from "fs";
import { BasisTheoryClient } from "@basis-theory/node-sdk";

const client = new BasisTheoryClient({ apiKey: "YOUR_API_KEY", correlationId: "YOUR_CORRELATION_ID" });
await client.documents.upload({});

The client accepts a variety of types for file upload parameters:

• Stream types: fs.ReadStream, stream.Readable, and ReadableStream
• Buffered types: Buffer, Blob, File, ArrayBuffer, ArrayBufferView, and Uint8Array

Metadata

You can configure metadata when uploading a file:

const file: Uploadable.WithMetadata = {
    data: createReadStream("path/to/file"),
    filename: "my-file",       // optional
    contentType: "audio/mpeg", // optional
    contentLength: 1949,       // optional
};

Alternatively, you can upload a file directly from a file path:

const file : Uploadable.FromPath = {
    path: "path/to/file",
    filename: "my-file",        // optional
    contentType: "audio/mpeg",  // optional
    contentLength: 1949,        // optional
};

The metadata is used to set the Content-Length, Content-Type, and Content-Disposition headers. If not provided, the client will attempt to determine them automatically. For example, fs.ReadStream has a path property which the SDK uses to retrieve the file size from the filesystem without loading it into memory.

Binary Response

You can consume binary data from endpoints using the BinaryResponse type which lets you choose how to consume the data:

const response = await client.documents.data.get(...);
const stream: ReadableStream<Uint8Array> = response.stream();
// const arrayBuffer: ArrayBuffer = await response.arrayBuffer();
// const blob: Blob = response.blob();
// const bytes: Uint8Array = response.bytes();
// You can only use the response body once, so you must choose one of the above methods.
// If you want to check if the response body has been used, you can use the following property.
const bodyUsed = response.bodyUsed;

Save binary response to a file

Node.js

ReadableStream (most-efficient)

import { createWriteStream } from 'fs';
import { Readable } from 'stream';
import { pipeline } from 'stream/promises';

const response = await client.documents.data.get(...);

const stream = response.stream();
const nodeStream = Readable.fromWeb(stream);
const writeStream = createWriteStream('path/to/file');

await pipeline(nodeStream, writeStream);

ArrayBuffer

import { writeFile } from 'fs/promises';

const response = await client.documents.data.get(...);

const arrayBuffer = await response.arrayBuffer();
await writeFile('path/to/file', Buffer.from(arrayBuffer));

Blob

import { writeFile } from 'fs/promises';

const response = await client.documents.data.get(...);

const blob = await response.blob();
const arrayBuffer = await blob.arrayBuffer();
await writeFile('output.bin', Buffer.from(arrayBuffer));

Bytes (UIntArray8)

import { writeFile } from 'fs/promises';

const response = await client.documents.data.get(...);

const bytes = await response.bytes();
await writeFile('path/to/file', bytes);

Bun

ReadableStream (most-efficient)

const response = await client.documents.data.get(...);

const stream = response.stream();
await Bun.write('path/to/file', stream);

ArrayBuffer

const response = await client.documents.data.get(...);

const arrayBuffer = await response.arrayBuffer();
await Bun.write('path/to/file', arrayBuffer);

Blob

const response = await client.documents.data.get(...);

const blob = await response.blob();
await Bun.write('path/to/file', blob);

Bytes (UIntArray8)

const response = await client.documents.data.get(...);

const bytes = await response.bytes();
await Bun.write('path/to/file', bytes);

Deno

ReadableStream (most-efficient)

const response = await client.documents.data.get(...);

const stream = response.stream();
const file = await Deno.open('path/to/file', { write: true, create: true });
await stream.pipeTo(file.writable);

ArrayBuffer

const response = await client.documents.data.get(...);

const arrayBuffer = await response.arrayBuffer();
await Deno.writeFile('path/to/file', new Uint8Array(arrayBuffer));

Blob

const response = await client.documents.data.get(...);

const blob = await response.blob();
const arrayBuffer = await blob.arrayBuffer();
await Deno.writeFile('path/to/file', new Uint8Array(arrayBuffer));

Bytes (UIntArray8)

const response = await client.documents.data.get(...);

const bytes = await response.bytes();
await Deno.writeFile('path/to/file', bytes);

Browser

Blob (most-efficient)

const response = await client.documents.data.get(...);

const blob = await response.blob();
const url = URL.createObjectURL(blob);

// trigger download
const a = document.createElement('a');
a.href = url;
a.download = 'filename';
a.click();
URL.revokeObjectURL(url);

ReadableStream

const response = await client.documents.data.get(...);

const stream = response.stream();
const reader = stream.getReader();
const chunks = [];

while (true) {
  const { done, value } = await reader.read();
  if (done) break;
  chunks.push(value);
}

const blob = new Blob(chunks);
const url = URL.createObjectURL(blob);

// trigger download
const a = document.createElement('a');
a.href = url;
a.download = 'filename';
a.click();
URL.revokeObjectURL(url);

ArrayBuffer

const response = await client.documents.data.get(...);

const arrayBuffer = await response.arrayBuffer();
const blob = new Blob([arrayBuffer]);
const url = URL.createObjectURL(blob);

// trigger download
const a = document.createElement('a');
a.href = url;
a.download = 'filename';
a.click();
URL.revokeObjectURL(url);

Bytes (UIntArray8)

const response = await client.documents.data.get(...);

const bytes = await response.bytes();
const blob = new Blob([bytes]);
const url = URL.createObjectURL(blob);

// trigger download
const a = document.createElement('a');
a.href = url;
a.download = 'filename';
a.click();
URL.revokeObjectURL(url);

Convert binary response to text

ReadableStream

const response = await client.documents.data.get(...);

const stream = response.stream();
const text = await new Response(stream).text();

ArrayBuffer

const response = await client.documents.data.get(...);

const arrayBuffer = await response.arrayBuffer();
const text = new TextDecoder().decode(arrayBuffer);

Blob

const response = await client.documents.data.get(...);

const blob = await response.blob();
const text = await blob.text();

Bytes (UIntArray8)

const response = await client.documents.data.get(...);

const bytes = await response.bytes();
const text = new TextDecoder().decode(bytes);