Streamlet Package Documentation

@streamlet/sdk

Use the official npm package when you want a simpler JavaScript client for video uploads, image hosting, PDF document hosting, and status checks — plus a clean React player around your Streamlet playback URLs.

Templates

Browse the official Streamlet starter repository for ready-to-use frontend and backend templates. Open Streamlet-Templates.

Template	Stack	Purpose
Next.js Video Upload	Next.js 16	Upload a video, queue processing, and poll for status with @streamlet/sdk.
Next.js Image Upload	Next.js 16	Upload images and use the returned Streamlet CDN URLs in your app.
Next.js Player	Next.js 16	Embed playback with the Streamlet React player starter.
Node.js Express REST API	Node.js / Express	Wrap Streamlet REST API routes in an Express backend.
Go REST API	Go	Proxy video upload, image upload, and status checks from Go services.
Python REST API	Python / FastAPI	Build Streamlet-backed upload and status endpoints with Python.
Rust REST API	Rust / Axum	Use Streamlet from a Rust backend service.
Java REST API	Java / Spring Boot	Integrate Streamlet REST endpoints into Java backend applications.

Install

Install the package for JavaScript client usage. Add React and React DOM if you want to use the player and editor components.

Install package

Bash

# JavaScript / Node.js client only
npm install @streamlet/sdk

# With React player + editor components
npm install @streamlet/sdk react react-dom

JavaScript Client

Create one StreamletClient with your API credentials, then call uploadVideo() to queue a video and getVideoStatus() to check progress.

Use StreamletClient

JavaScript

import { StreamletClient } from "@streamlet/sdk";

const client = new StreamletClient({
  baseUrl: "https://api.streamlet.in",
  apiKey: "your_streamlet_api_key",
  accountNumber: "your_account_id"
});

// Upload — returns immediately with a videoId
const result = await client.uploadVideo({
  file,
  videoTitle: "Launch Demo",
  enableCaption: true,
  captionLanguages: ["english", "hindi", "tamil"],
  saveOriginalFile: false
});

console.log(result.videoId); // "Launch-Demo-1715000000000"

// Check status once
const status = await client.getVideoStatus(result.videoId);
console.log(status.status); // "queued" | "processing" | "completed" | "failed"

Upload Options

All parameters accepted by uploadVideo(). Only file is required.

Set uploadType: "private" to upload the file directly to storage with no processing — it resolves immediately with status: "completed" and a streamUrl. The default uploadType: "streaming" runs the full transcoding pipeline and all the options below.

uploadVideo() — full options

JavaScript

await client.uploadVideo({
  // Required
  file,                            // File or Blob

  // Upload type
  uploadType: "streaming",         // "streaming" (default) = full processing pipeline
                                   // "private" = direct upload to storage, no processing
                                   // (all options below are ignored for private uploads)

  // Optional
  videoTitle: "My video",          // defaults to the file name
  saveOriginalFile: false,         // keep source in cloud storage
  autoAudioEnhancement: true,      // AI audio cleanup before encode
  storageSaverEncoding: false,     // smaller HLS files, slower processing

  // Captions
  enableCaption: true,
  captionLanguages: [
    "english",    // always the base language (Whisper)
    "hindi",      // translated from English
    "tamil",
    "telugu",
    "kannada",
    "malayalam"
  ],

  // Resolution upgrades
  enable2kOutput: false,           // add 1440p rendition — Builder and Pro plans
  enable4kOutput: false,           // add 2160p rendition — Pro plan only

  // Watermark — paid plans (Starter, Builder, Pro) only.
  // Free plan: "streamlet.in" is always stamped; these fields are ignored.
  // Paid plan: set enableWatermark: true for a custom overlay, false/omit for no watermark.
  enableWatermark: true,           // true = custom watermark, false = no watermark at all
  watermarkText: "© MyBrand 2024" // max 60 characters; only used when enableWatermark: true
});

Plan Limits

Streamlet enforces per-plan storage and video duration limits. When a limit is exceeded the API returns an error before any processing starts — no partial charges or silent failures.

Video duration limit

Free-plan accounts may only upload videos up to 6 minutes (360 seconds). Uploads longer than this are rejected with the error code DURATION_LIMIT_EXCEEDED. Paid plans have no duration cap.

Handle duration limit error

JavaScript

import { StreamletClient } from "@streamlet/sdk";

const client = new StreamletClient({ baseUrl, apiKey, accountNumber });

try {
  const result = await client.uploadVideo({ file, videoTitle: "Long Video" });
  console.log(result.videoId);
} catch (err) {
  if (err.code === "DURATION_LIMIT_EXCEEDED") {
    // Free plan: video longer than 6 minutes
    console.error("Upgrade your plan to upload longer videos.");
  } else {
    throw err;
  }
}

Plan	Max video duration	Storage	Max resolution	2K output	4K output	Caption quota / month	Watermark
`free`	6 minutes	1 GB	480p	—	—	10 minutes	Forced — `streamlet.in`
`starter`	Unlimited	50 GB	720p	—	—	5 hours	Optional custom text
`builder`	Unlimited	200 GB	2K (1440p)	`enable2kOutput`	—	25 hours	Optional custom text
`pro`	Unlimited	500 GB	4K (2160p)	`enable2kOutput`	`enable4kOutput`	50 hours	Optional custom text

Caption quota

Caption usage is tracked per account and resets on the 1st of each month. The quota is based on the total duration of videos processed with captions enabled. When the quota is exhausted, uploads with enableCaption: true are rejected with error code CAPTION_QUOTA_EXCEEDED.

Handle caption quota error

JavaScript

try {
  const result = await client.uploadVideo({
    file,
    videoTitle: "Demo",
    enableCaption: true,
    captionLanguages: ["english", "hindi"],
  });
  console.log(result.videoId);
} catch (err) {
  if (err.code === "CAPTION_QUOTA_EXCEEDED") {
    // Monthly caption quota used up — upgrade or wait for reset
    console.error("Caption quota exhausted. Upgrade your plan or wait for the monthly reset.");
  } else if (err.code === "DURATION_LIMIT_EXCEEDED") {
    console.error("Free plan: video must be under 6 minutes.");
  } else {
    throw err;
  }
}

Polling

Use pollVideoStatus() to automatically wait until processing completes instead of writing your own loop. It resolves with the final status once the job is "completed" or "failed", and throws if the timeout is exceeded.

Poll until done

JavaScript

import { StreamletClient } from "@streamlet/sdk";

const client = new StreamletClient({ baseUrl, apiKey, accountNumber });

const { videoId } = await client.uploadVideo({ file, videoTitle: "Demo" });

const finalStatus = await client.pollVideoStatus(videoId, {
  interval: 4000,       // check every 4 s (default)
  timeout: 600_000,     // give up after 10 min (default)
  onProgress: (status) => {
    console.log("still processing…", status.status);
  }
});

if (finalStatus.status === "completed") {
  console.log("Stream URL:", finalStatus.streamUrl);
  console.log("Thumbnail:", finalStatus.thumbnail);
  console.log("Captions:", finalStatus.captions);
  // { en: "https://…/captions.en.vtt", hi: "https://…/captions.hi.vtt", … }
} else {
  console.error("Processing failed:", finalStatus.error);
}

Image Hosting

Use uploadImage()to store images on Streamlet's CDN. The backend auto-rotates, resizes to a max of 2000 px wide, and converts every upload to WebP at quality 85. The result is a permanent, public CDN URL ready to drop into any <img> or <StreamletPlayer> posterUrl.

Accepted formats: JPEG, PNG, WebP, AVIF, GIF. Maximum file size is 20 MB. Storage counts toward the account plan quota.

Upload an image

JavaScript

import { StreamletClient } from "@streamlet/sdk";

const client = new StreamletClient({
  baseUrl: "https://api.streamlet.in",
  apiKey: "your_streamlet_api_key",
  accountNumber: "your_account_id"
});

// Pass a File (browser) or a Buffer / ReadStream (Node.js)
const image = await client.uploadImage({ file: imageFile });

console.log(image.cdnUrl);
// "https://cdn.streamlet.in/<accountId>/images/product-banner-1775211037986.webp"

console.log(image.width, image.height);  // 1200, 630
console.log(image.sizeBytes);            // 84320

Use the CDN URL as a video poster

JavaScript

// Upload thumbnail first, then reference it in the player
const thumb = await client.uploadImage({ file: thumbnailFile });

const { videoId } = await client.uploadVideo({
  file: videoFile,
  videoTitle: "Product Demo"
});

const status = await client.pollVideoStatus(videoId);

// Use the uploaded image as a custom poster
console.log(thumb.cdnUrl);      // custom thumbnail CDN URL
console.log(status.streamUrl);  // HLS stream URL

uploadImage() — response shape

TypeScript

type ImageUploadResult = {
  success: true;
  imageId: string;   // "product-banner-1775211037986"
  cdnUrl:  string;   // "https://cdn.streamlet.in/.../images/<imageId>.webp"
  streamletKey:   string;   // "<userId>/images/<imageId>.webp"
  width:   number;   // final pixel width after resize
  height:  number;   // final pixel height after resize
  sizeBytes: number; // WebP output size in bytes
};

Document Hosting

Use uploadDocument()to store PDF files on Streamlet's CDN. The file is stored as-is and a permanent public CDN URL is returned immediately — no processing queue, no polling required.

Accepted format: PDF only. Maximum file size is 50 MB. Storage counts toward the account plan quota.

Upload a PDF document

JavaScript

import { StreamletClient } from "@streamlet/sdk";

const client = new StreamletClient({
  baseUrl: "https://api.streamlet.in",
  apiKey: "your_streamlet_api_key",
  accountNumber: "your_account_id"
});

// Pass a File (browser) or a Buffer / ReadStream (Node.js)
const doc = await client.uploadDocument({ file: pdfFile });

console.log(doc.cdnUrl);
// "https://cdn.streamlet.in/<accountId>/documents/product-spec-1775211037986.pdf"

console.log(doc.originalFilename); // "product-spec.pdf"
console.log(doc.sizeBytes);        // 245760

uploadDocument() — response shape

TypeScript

type DocumentUploadResult = {
  success: true;
  documentId:       string; // "product-spec-1775211037986"
  cdnUrl:           string; // "https://cdn.streamlet.in/.../documents/<documentId>.pdf"
  streamletKey:     string; // "<userId>/documents/<documentId>.pdf"
  originalFilename: string; // "product-spec.pdf"
  sizeBytes:        number; // file size in bytes
};

React Player

<StreamletPlayer /> is a responsive Mux wrapper with a built-in chapter sidebar, progress timeline, and subtitle tracks. Pass the streamUrl returned by pollVideoStatus() and the player handles the rest.

Use StreamletPlayer

JavaScript

import { StreamletPlayer } from "@streamlet/sdk/react";

// Minimal — just play the video
<StreamletPlayer
  title="Launch Demo"
  streamUrl={status.streamUrl}
  posterUrl={status.thumbnail}
/>

// Full — captions + chapters + custom theme
<StreamletPlayer
  title="Launch Demo"
  streamUrl={status.streamUrl}
  posterUrl={status.thumbnail}
  ownerName="Shangesh"
  createdAt={status.completedAt}

  captionLanguages={["english", "hindi", "tamil"]}

  chaptersUrl={status.chapters?.json}
  chapterTrackUrl={status.chapters?.vtt}

  showMeta={true}
  showTimeline={true}
  showChapterSidebar={true}

  theme={{
    accentColor: "#38bdf8",
    progressFillColor: "#2563eb",
    primaryColor: "#f8fafc",
    surfaceColor: "rgba(4,8,15,0.94)"
  }}
/>