Fix JavaScript Async Await Promise Pending Code Utilities

Here are ready-to-use JavaScript code utilities to fix the common issue where async await function returns promise pending instead of data. These utilities help you debug and resolve async/await problems quickly.

Promise Status Checker Utility #

This utility helps you check if a promise is still pending and provides debugging information.

Async Function Wrapper #

A utility that automatically handles common async/await patterns and prevents promise pending issues.

Promise State Inspector #

A debugging utility that shows the current state of promises and helps identify pending issues.

// Promise state inspector utility
class PromiseInspector {
    constructor() {
        this.promises = new Map();
    }
    
    track(promise, name) {
        const id = Date.now() + Math.random();
        this.promises.set(id, { name, promise, status: 'pending', startTime: Date.now() });
        
        promise
            .then(result => {
                const promiseInfo = this.promises.get(id);
                promiseInfo.status = 'resolved';
                promiseInfo.result = result;
                promiseInfo.endTime = Date.now();
                promiseInfo.duration = promiseInfo.endTime - promiseInfo.startTime;
            })
            .catch(error => {
                const promiseInfo = this.promises.get(id);
                promiseInfo.status = 'rejected';
                promiseInfo.error = error;
                promiseInfo.endTime = Date.now();
                promiseInfo.duration = promiseInfo.endTime - promiseInfo.startTime;
            });
            
        return promise;
    }
    
    getStatus() {
        const status = {};
        this.promises.forEach((info, id) => {
            status[info.name] = {
                status: info.status,
                duration: info.duration || `${Date.now() - info.startTime}ms (ongoing)`
            };
        });
        return status;
    }
    
    getPending() {
        const pending = [];
        this.promises.forEach((info) => {
            if (info.status === 'pending') {
                pending.push({
                    name: info.name,
                    duration: Date.now() - info.startTime
                });
            }
        });
        return pending;
    }
}

Auto-Await Function Converter #

Converts regular functions to properly handle async operations.

Promise Chain Debugger #

A utility to debug complex promise chains and identify where pending issues occur.

Quick Fix Template #

A template for fixing the most common async/await promise pending issues:

// Quick fix template for async/await issues
async function fixedAsyncFunction() {
    try {
        // 1. Always use await for async operations
        const response = await fetch('/api/data');
        
        // 2. Check response status
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        
        // 3. Await JSON parsing
        const data = await response.json();
        
        // 4. Return the actual data, not a promise
        return data;
        
    } catch (error) {
        // 5. Always handle errors
        console.error('Operation failed:', error.message);
        throw error; // Re-throw if needed
    }
}

// Usage: Always await when calling
async function useFixedFunction() {
    try {
        const result = await fixedAsyncFunction();
        console.log('Success:', result);
    } catch (error) {
        console.error('Error:', error.message);
    }
}

Usage Tips #

1. Copy and customize these utilities for your specific needs
2. Use the inspector to track multiple promises in complex applications
3. Apply the wrapper to existing functions that return promises
4. Use debugging chains for troubleshooting multi-step async operations

These utilities help you quickly identify and fix issues where your JavaScript async await function returns promise pending instead of data. For more detailed explanations, see our async await error guide.