Fix Async Await Promise Pending - Code Utilities

When your JavaScript async await function returns promise pending instead of data, these utility functions will help you debug and fix the issue quickly. Use these ready-to-use code snippets to handle promise pending problems effectively.

Promise State Detector #

This utility helps identify why your async await function returns promise pending:

Async Function Wrapper #

Use this wrapper to ensure your async functions are properly awaited:

// Wrapper to fix promise pending issues in async functions
function createAsyncWrapper(asyncFunction) {
    return async function(...args) {
        try {
            console.log('Executing async function...');
            const result = await asyncFunction.apply(this, args);
            console.log('Async function completed successfully');
            return result;
        } catch (error) {
            console.error('Async function failed:', error);
            throw error;
        }
    };
}

// Example usage
const wrappedFunction = createAsyncWrapper(async () => {
    const data = await fetch('/api/data');
    return data.json();
});

Promise Timeout Handler #

Prevent promises from staying pending indefinitely:

Async Function Debugger #

Debug why your async await function returns promise pending with detailed logging:

// Advanced debugger for async function promise pending issues
class AsyncDebugger {
    static async debugAsyncFunction(asyncFunc, ...args) {
        const startTime = Date.now();
        console.log('🔍 Starting async function debug...');
        
        try {
            console.log('⏳ Awaiting function execution...');
            const result = await asyncFunc(...args);
            const endTime = Date.now();
            
            console.log('✅ Function completed successfully');
            console.log(`⏱️ Execution time: ${endTime - startTime}ms`);
            console.log('📊 Result:', result);
            
            return result;
        } catch (error) {
            const endTime = Date.now();
            console.log('❌ Function failed');
            console.log(`⏱️ Failed after: ${endTime - startTime}ms`);
            console.log('🚨 Error:', error);
            throw error;
        }
    }
    
    static wrapFunction(asyncFunc, functionName = 'Anonymous') {
        return async (...args) => {
            console.log(`🚀 Calling ${functionName} with args:`, args);
            return this.debugAsyncFunction(asyncFunc, ...args);
        };
    }
}

Promise Chain Validator #

Validate promise chains to prevent pending state issues:

Safe Async Executor #

Execute async functions safely with automatic promise pending detection:

// Safe executor to prevent promise pending issues
class SafeAsyncExecutor {
    static async execute(asyncFunction, options = {}) {
        const {
            timeout = 10000,
            retries = 3,
            retryDelay = 1000,
            onRetry = null
        } = options;
        
        for (let attempt = 1; attempt <= retries; attempt++) {
            try {
                console.log(`Attempt ${attempt}/${retries}`);
                
                const result = await promiseWithTimeout(
                    asyncFunction(),
                    timeout,
                    `Function timeout after ${timeout}ms`
                );
                
                console.log('✅ Function executed successfully');
                return result;
                
            } catch (error) {
                console.error(`❌ Attempt ${attempt} failed:`, error.message);
                
                if (attempt === retries) {
                    throw new Error(`All ${retries} attempts failed. Last error: ${error.message}`);
                }
                
                if (onRetry) {
                    onRetry(attempt, error);
                }
                
                await new Promise(resolve => setTimeout(resolve, retryDelay));
            }
        }
    }
}

Async Function Tester #

Test if your async functions properly return data instead of pending promises:

Usage Instructions #

1. For debugging: Use promiseStateDetector to track promise states
2. For safety: Wrap async functions with createAsyncWrapper
3. For timeouts: Use promiseWithTimeout to prevent infinite pending
4. For validation: Use PromiseChainValidator for complex async flows
5. For testing: Use AsyncFunctionTester to verify function behavior

Common Implementation Patterns #

// Pattern 1: Safe async data fetching
async function safeFetchData(url) {
    const wrappedFetch = createAsyncWrapper(async () => {
        const response = await fetch(url);
        return response.json();
    });
    
    return promiseWithTimeout(wrappedFetch(), 5000);
}

// Pattern 2: Multiple async operations
async function safeMultipleOperations() {
    const operations = [
        () => fetchUserData(),
        () => fetchUserPosts(),
        () => fetchUserSettings()
    ];
    
    return PromiseChainValidator.validateChain(
        operations,
        ['User Data', 'Posts', 'Settings']
    );
}

These utilities will help you identify and fix issues when your JavaScript async await function returns promise pending instead of data, ensuring more reliable asynchronous code execution.

Related Code #

• JavaScript Error Handling Utilities
• Async Programming Examples
• Promise Debugging Guide