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JavaScriptClaude API Call

Basic example of calling the Claude API with streaming

JavaScriptTool Definition

Define a tool for Claude to use in your applications

JavaScriptStreaming Response

Handle streaming responses from Claude

JavaScriptError Handling

Handle API errors gracefully

// Example: Error handling patterns

class APIError extends Error {
  constructor(status, message) {
    super(message);
    this.status = status;
    this.name = "APIError";
  }
}

async function callAPI(endpoint) {
  // Simulate different error scenarios
  const scenarios = [
    { status: 200, success: true },
    { status: 429, error: "Rate limit exceeded" },
    { status: 401, error: "Invalid API key" },
    { status: 500, error: "Internal server error" }
  ];

const scenario = scenarios[Math.floor(Math.random() * scenarios.length)];

if (scenario.success) {
    console.log("✅ Request successful!");
    return { data: "Response data here" };
  }

throw new APIError(scenario.status, scenario.error);
}

async function main() {
  try {
    const result = await callAPI("/v1/messages");
    console.log("Result:", result);
  } catch (error) {
    if (error instanceof APIError) {
      console.log(`❌ API Error (${error.status}): ${error.message}`);

if (error.status === 429) {
        console.log("→ Retry after delay...");
      } else if (error.status === 401) {
        console.log("→ Check your API key");
      }
    } else {
      console.log("❌ Unexpected error:", error.message);
    }
  }
}

main();

PythonPython Basicssimulated

Basic Python syntax with print, lists, and loops (simulated)

PythonPython Functionssimulated

Define and call functions in Python (simulated)

PythonPython Data Processingsimulated

Working with data structures in Python (simulated)

GoGo Example

Claude API call in Go (view only - cannot run in browser)

JSONJSON Validation

Validate and format JSON data

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