Developer Tools Suite - Free Online Developer Tools

📡 Webhook Inspector

Create persistent webhook endpoints and inspect requests like webhook.site

Webhook Name (optional):

Description (optional):

Request History

📡

No requests yet

Create a webhook endpoint above and start receiving requests!

⏰ Cron Job Debugger

Test and debug cron expressions with human-readable explanations

Cron Expression:

Timezone:

🔐 JWT Decoder & Validator

Decode, validate, and analyze JWT tokens

JWT Token:

Secret (for verification):

⚡ API Rate-Limit Tester

Test API endpoints with configurable load and concurrency

URL:

Method:

Concurrency:

Requests/sec:

Duration (sec):

📧 Email Template Previewer

Upload and preview HTML email templates across different themes and devices

Upload HTML Template:

Or paste HTML content:

Saved Templates

No templates yet. Upload or create one to get started.

💬 Socket.IO Testing Playground

Connect to any Socket.IO server and test real-time events

Connection Configuration

Server URL:

Namespace:

Connection Options (JSON):

Disconnected

Send Event

Event Name:

Event Data (JSON):

Event Listeners

Listen to Event:

No active listeners

Common Events

Welcome to the Socket.IO Testing Playground!

Configure your server connection and start testing real-time events.

Features:

Connect to any Socket.IO server
Send custom events with JSON data
Listen to specific events
Real-time event logging
Connection state monitoring

🔍 Regex Playground

Test regular expressions with real-time matching and explanations

Regular Expression:

Flags:

Test String:

📋 JSON Formatter & Search

Format, validate, and search through JSON data with advanced filtering

Search & Filter

Case Sensitive Use Regex Highlight

Line Numbers Collapsible

Size: 0 bytes

Keys: 0

Depth: 0

Type: -

🌐 HTML Renderer & Preview

Write, preview, and test HTML/CSS/JavaScript code with live rendering

Preview

📨 SMTP Tester & Email Validator

Test SMTP servers, send test emails, and validate email configurations

SMTP Configuration

SMTP Host:

Port:

Security:

Authentication:

Username:

Password:

Compose Test Email

From:

To:

CC:

BCC:

Subject:

Email History

No emails sent yet. Send a test email to see it here.

☁️ S3 Bucket Credentials Tester

Test AWS S3 credentials, manage buckets, and perform file operations

AWS S3 Credentials

Endpoint URL (Optional): For MinIO, LocalStack, or other S3-compatible services

Access Key ID:

Secret Access Key:

AWS Region:

Session Token (Optional):

S3 Operations

Test credentials first to see your buckets

Select Bucket:

Current Path:

Select a bucket to view objects

Target Bucket:

Upload Path (Optional):

Select Files:

Storage Class:

Bucket:

Select a bucket and check permissions

Activity Log

Activity will be logged here...

S3-Compatible Storage Help

Setting up AWS S3 Credentials:

Go to AWS IAM Console
Create a new user or select existing user
Attach S3 permissions policy (e.g., AmazonS3FullAccess)
Create access keys for the user
Copy Access Key ID and Secret Access Key
Leave Endpoint URL empty for AWS S3

Setting up MinIO:

Install and start MinIO server
Get the MinIO access key and secret key
Enter the MinIO endpoint URL (e.g., http://localhost:9000)
Use any region (MinIO ignores this)
Test credentials to verify connection

Common Endpoint URLs:

MinIO (local): http://localhost:9000
MinIO (custom): https://minio.example.com:9000
LocalStack: http://localhost:4566
DigitalOcean Spaces: https://nyc3.digitaloceanspaces.com
Wasabi: https://s3.wasabisys.com

Required Permissions:

s3:ListAllMyBuckets - List all buckets
s3:ListBucket - List objects in buckets
s3:GetObject - Download objects
s3:PutObject - Upload objects
s3:DeleteObject - Delete objects
s3:GetBucketPolicy - View bucket policies

Security Tips:

Never share your credentials
Use IAM roles when possible (AWS)
Regularly rotate access keys
Follow principle of least privilege
Use HTTPS endpoints in production

🇮 Image Converter & Compressor

Convert between image formats and compress images to reduce file size

Upload Image

🇮

Drag & drop an image here or click to browse

Supported Formats:

JPEG PNG WebP GIF BMP TIFF

Original Image

🖼️

No image selected

Conversion & Compression Settings

Output Format

JPEG PNG WebP GIF

Quality Settings

Quality: 80%

Resize Options

Enable Resize

🧠 AI Prompt Tester

Test and compare LLM responses across different AI providers with your own API keys

AI Provider Configuration

OpenAI API Key:

Your API key is stored locally and never sent to our servers

Model:

Temperature: 0.7

Max Tokens:

Anthropic API Key:

Your API key is stored locally and never sent to our servers

Model:

Temperature: 0.7

Max Tokens:

Google AI API Key:

Your API key is stored locally and never sent to our servers

Model:

Temperature: 0.7

Max Tokens:

API Endpoint:

API Key:

Model:

Custom Headers:

Prompt Testing

System Message:

User Message:

Assistant Context (optional):

Compare Multiple Providers Enable Streaming Save to History

AI Responses

- -

- - -

🤖

AI response will appear here after testing a prompt

Prompt History

No prompts tested yet

Prompt Templates

Writing & Content

Code & Technical

Analysis & Research

Usage Analytics

Total Tests

Avg Response Time

Most Used Provider

Estimated Cost

$0.00

Usage Over Time

Chart will appear after testing prompts

🔐 Payload Checksum Generator

Generate and verify checksums for text, files, and URLs using various hash algorithms

Select Hash Algorithms

Text Input

Enter text to generate checksums:

Trim whitespace

Normalize whitespace

Real-time generation

🧂 Use Salt

File Upload

Select file:

Click to select a file or drag & drop

No file selected

URL Fetch

URL to fetch:

HTTP Method:

Headers (JSON):

Request Body:

Verify Checksum

Expected checksum:

Algorithm:

📋 History

📄 Log File Reader & Analyzer

Upload and analyze log files with intelligent parsing and filtering

Upload Log File

Select Log File:

Supported formats: .log, .txt, .out, .err (up to 100MB)

📊 Advanced Log Viewer

For server logs with advanced analytics, charts, and powerful filtering:

Advanced features include:

📊 Analytics dashboard with interactive charts
🔍 Powerful search across all server logs
📈 Response time and performance analysis
🎯 Top endpoints and IP address tracking
📊 Visual log level distribution

📄

No log file loaded

Upload a log file to start analyzing

📤 Webhook → Email Forwarder

Forward webhook payloads to email addresses for debugging

Forwarder Name:

Email Address:

Email Subject:

Active Forwarders

No forwarders yet. Create one to get started.

📡 Webhook Inspector

Webhook Endpoint

Request History

No requests yet

My Webhook Endpoints

⏰ Cron Job Debugger

Explanation

Next 10 Executions

🔐 JWT Decoder & Validator

Header

Payload

Signature

⚡ API Rate-Limit Tester

Requests

Success Rate

Avg Response Time

Throughput

📧 Email Template Previewer

Saved Templates

💬 Socket.IO Testing Playground

Connection Configuration

Send Event

Event Listeners

Common Events

🔍 Regex Playground

Matches (0)

Explanation

📋 JSON Formatter & Search

Search & Filter

🌐 HTML Renderer & Preview

Preview

Console Output

Quick Templates

📨 SMTP Tester & Email Validator

SMTP Configuration

Compose Test Email

Email History

SMTP Presets

☁️ S3 Bucket Credentials Tester

AWS S3 Credentials

S3 Operations

Activity Log

S3-Compatible Service Presets

S3-Compatible Storage Help

Setting up AWS S3 Credentials:

Setting up MinIO:

Common Endpoint URLs:

Required Permissions:

Security Tips:

🇮 Image Converter & Compressor

Upload Image

Supported Formats:

Original Image

Conversion & Compression Settings

Output Format

Quality Settings

Resize Options

Converted Image

Conversion Presets

Web Optimized

Social Media

Thumbnail

Print Quality

Email Friendly

🧠 AI Prompt Tester

AI Provider Configuration

Prompt Testing

AI Responses

Response Analysis

Prompt History

Prompt Templates

Writing & Content

Code & Technical

Analysis & Research

Usage Analytics

Usage Over Time

🔐 Payload Checksum Generator

Select Hash Algorithms

Text Input

File Upload

📋 History