Update Lazer getting started guide with JavaScript example walkthrough (#843)

* Update Lazer getting started guide with JavaScript example walkthrough

- Replace minimal content with comprehensive step-by-step guide
- Include prerequisites, setup instructions, and code examples
- Add Next Steps section linking to SVM and EVM integration guides
- Reference the JavaScript example from pyth-examples repository

Co-Authored-By: Jayant <[email protected]>

* Fix prettier formatting issues in Lazer getting started guide

- Apply prettier formatting to resolve pre-commit CI failure
- Add blank lines and wrap long lines per prettier rules

Co-Authored-By: Jayant <[email protected]>

* fixes

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Jayant <[email protected]>
Co-authored-by: Jayant Krishnamurthy <[email protected]>

Author: 3 people

pages/lazer/getting-started.mdx

@@ -1,3 +1,155 @@
+import { Callout, Steps } from "nextra/components";
+
 # Getting Started with Pyth Lazer
 
-Please refer to the how-to guides to get started.
+Pyth Lazer is a high-performance, low-latency service that provides real-time financial market data.
+This guide will walk you through setting up and running a basic JavaScript example to subscribe to Lazer price feeds.
+
+## Prerequisites
+
+Before getting started, make sure you have the following installed:
+
+- **Node.js** (version 18 or higher)
+- **pnpm** package manager
+- **Git** for cloning the examples repository
+- A **Lazer Access Token** - see [How to Acquire an Access Token](./acquire-access-token) if you don't have one
+
+<Steps>
+
+### Clone the Examples Repository
+
+First, clone the Pyth examples repository which contains the JavaScript SDK example:
+
+```bash copy
+git clone https://github.com/pyth-network/pyth-examples.git
+cd pyth-examples/lazer/js
+```
+
+### Install Dependencies
+
+Install the required dependencies using pnpm:
+
+```bash copy
+pnpm install
+```
+
+This will install `@pythnetwork/pyth-lazer-sdk`, which is the main Lazer SDK.
+
+### Configure Your Access Token
+
+Set your Lazer access token as an environment variable:
+
+```bash copy
+export ACCESS_TOKEN=your_actual_token_here
+```
+
+<Callout type="warning" emoji="⚠️">
+  Replace `your_actual_token_here` with your actual Lazer access token. If you
+  don't have one, follow the [access token guide](./acquire-access-token) to
+  obtain it.
+</Callout>
+
+### Run the Basic WebSocket Example
+
+Now you can run the basic example that demonstrates connecting to Lazer and receiving price updates:
+
+```bash copy
+pnpm run start
+```
+
+This command will subscribe to Pyth Lazer updates for two price feeds, receiving streaming updates.
+Each update is then printed to the terminal on receipt.
+You should see output similar to the following:
+
+```
+got message: {
+  type: 'json',
+  value: {
+    type: 'streamUpdated',
+    subscriptionId: 1,
+    parsed: { timestampUs: '1758034015200000', priceFeeds: [Array] },
+    solana: {
+      encoding: 'hex',
+      data: 'b9011a82036df6ced259a33949ab9b2c48a61a2d3b0b9436cba24c3ef8a600b72767927d14a459fcc3abce280b3f8194e16e8b32f9322ac0b84a9c0b792e19857962a60180efc1f480c5615af3fb673d42287e993da9fbc3506b6e41dfa32950820c2e6c2a0075d3c79300a3fa30ec3e060003020100000001009053802f790a00000200000001004234106d67000000'
+    }
+  }
+}
+stream updated for subscription 1 : [
+  { priceFeedId: 1, price: '11515604259728' },
+  { priceFeedId: 2, price: '444211409986' }
+]
+got message: {
+  type: 'json',
+  value: {
+    type: 'streamUpdated',
+    subscriptionId: 1,
+    parsed: { timestampUs: '1758034015400000', priceFeeds: [Array] },
+    solana: {
+      encoding: 'hex',
+      data: 'b9011a826f5ff7e25ac4056c4ec3a08c428baf38e7b78c46014296ccbcfd5395c38c9f7bc23865a048401c66788e791f0edc3a6701b0ea4a5399f50ec8b1795757854f0180efc1f480c5615af3fb673d42287e993da9fbc3506b6e41dfa32950820c2e6c2a0075d3c79340b0fd30ec3e060003020100000001005821a32f790a00000200000001004334106d67000000'
+    }
+  }
+}
+stream updated for subscription 1 : [
+  { priceFeedId: 1, price: '11515606540632' },
+  { priceFeedId: 2, price: '444211409987' }
+]
+```
+
+### Understanding the Code
+
+The main example code in `src/index.ts` demonstrates the core Lazer integration pattern:
+
+```typescript
+import { PythLazerClient } from "@pythnetwork/pyth-lazer-sdk";
+
+const client = await PythLazerClient.create({
+  urls: ["wss://pyth-lazer.dourolabs.app/v1/stream"],
+  token: process.env.ACCESS_TOKEN!,
+});
+
+// The message listener is called every time a new message is received.
+client.addMessageListener((message) => {
+  // Add your logic to consume messages here
+  console.log("got message:", message);
+});
+
+// Subscribe to price feeds
+client.subscribe({
+  type: "subscribe",
+  subscriptionId: 1,
+  priceFeedIds: [1, 2],
+  properties: ["price"],
+  formats: ["solana"],
+  deliveryFormat: "json",
+  channel: "fixed_rate@200ms",
+  jsonBinaryEncoding: "hex",
+});
+```
+
+</Steps>
+
+## What's Next?
+
+Now that you've successfully run the basic Lazer example, you can explore more advanced integration patterns:
+
+### More Information
+
+Explore additional Lazer capabilities:
+
+- **[Subscribe to Price Updates](./subscribe-price-updates)** - Detailed guide on WebSocket subscriptions and message handling
+- **[Price Feed IDs](./price-feed-ids)** - Complete list of available price feeds and their identifiers
+
+### Blockchain Integration
+
+Learn how to integrate Lazer price feeds into your smart contracts:
+
+- **[Solana Integration](./integrate-as-consumer/svm)** - Build SVM smart contracts that consume Lazer price feeds with cryptographic verification
+- **[EVM Integration](./integrate-as-consumer/evm)** - Integrate Lazer into Ethereum and other EVM-compatible chains
+
+### Example Applications
+
+Check out more comprehensive examples in the [pyth-examples repository](https://github.com/pyth-network/pyth-examples/tree/main/lazer):
+
+- **Solana Examples** - Post price data to Solana smart contracts with Ed25519 and ECDSA verification
+- **EVM Examples** - Smart contract integration for Ethereum-compatible chains