All Developer Tools
69_TOOLS · BROWSER_ONLY · NO_DATA_LEAVES_YOUR_DEVICE
ALL DEVELOPER TOOLS
JSON TOOLS
GROUP_ID: JSON_01
JSON Formatter
Pretty-print and format JSON with configurable indentation
JSON Validator
Validate JSON syntax and structure with detailed error messages
JSON Diff
Compare two JSON objects and highlight differences
JSON to YAML
Convert JSON to YAML format
YAML to JSON
Convert YAML to JSON format
JSON Minifier
Remove all whitespace from JSON to minimize file size
JSON Path Extractor
Extract values from JSON using dot notation paths
JSON Tree Viewer
Visualize JSON structure as an expandable tree
CSV to JSON
Convert CSV data to JSON array format
JSON to CSV
Convert JSON array to CSV format
XML to JSON
Convert XML to JSON format
JSON Schema Validator
Validate JSON data against a JSON Schema (Draft 7)
JSON Sample Generator
Generate sample JSON data from a JSON Schema
JSON Query Tool
Query JSON data using JSONPath-like expressions
Ruby Hash to JSON
Convert Ruby Hash syntax to valid JSON
Excel to JSON
Convert Excel files to JSON with support for multiple sheets and complex structures
DEVELOPER TOOLS
GROUP_ID: DEV_01
Regex Tester
Test regex patterns with live matching and capture groups
Cron Expression Parser
Explain cron expressions in plain English and preview the next 10 run times
UUID Generator
Generate v1/v4 UUIDs, validate UUIDs, bulk generation
URL Encoder/Decoder
Encode and decode URLs and query strings
Base64 Encoder/Decoder
Encode and decode Base64 and Base64URL
Duplicate Line Remover
Remove duplicate lines from text while preserving order
Webhook Sender
Free online webhook sender tool to test HTTP endpoints. Send POST, GET, PUT, PATCH, and DELETE requests with custom JSON payloads, headers, and timeout options.
Payload Generator
Generate realistic webhook payloads for Stripe, GitHub, and Shopify
Webhook Receiver
Create temporary URLs to capture and inspect incoming webhooks
HTML Entity Converter
Encode or decode HTML entities — escape special characters or convert entities back
URL Screenshot
Capture a screenshot of any website for sharing or presentations
SECURITY TOOLS
GROUP_ID: SEC_01
JWT Decoder
Decode and inspect JWT tokens — header, payload, claims, and expiry status
JWT Generator
Sign JWT tokens in the browser — HS256/384/512, RS256/384/512, PS256/384/512, ES256/384/512
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes
HMAC Generator
Generate and verify HMAC signatures for webhook verification
Secret Key Generator
Generate secure random secrets for SESSION_SECRET, JWT_SECRET, AUTH_SECRET, HMAC, API tokens, and webhooks
Bcrypt Playground
Hash passwords with bcrypt and verify hashes — adjust cost factor in the browser
Certificate Inspector
Parse and inspect X.509 certificates — view subject, issuer, expiry, SANs, fingerprint
Password Generator
Generate cryptographically secure passwords with entropy calculation
CONTENT TOOLS
GROUP_ID: CONTENT_01
Markdown Viewer
Convert markdown to HTML with real-time preview
Words Counter
Count words, characters, sentences, and analyze text statistics
Text Diff
Compare two texts and highlight differences line by line
HTML Preview
Preview HTML in real-time with a sandboxed iframe renderer
Case Converter
Convert text between camelCase, snake_case, kebab-case, UPPERCASE, lowercase, and more
Find & Replace
Find and replace text with regex, case-sensitive, and whole word matching
Text Sorter
Sort text lines ascending, descending, shuffle, or remove duplicates
UTILITY TOOLS
GROUP_ID: UTIL_01
Time Converter
Convert between different time units
Size Converter
Convert between different file size units
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
Color Converter
Convert colors between HEX, RGB, HSL, and named color formats
TECH SIMULATORS
GROUP_ID: SIM_01
Kafka Message Flow
Visualize how producers, partitions, and consumers move messages through a Kafka topic
Kafka Consumer Lag
Simulate consumer lag growth and recovery as produce/consume rates diverge
Kafka Consumer Rebalance
Watch partition rebalancing across a consumer group as members join and leave
Rate Limiters
Compare token bucket, leaky bucket, fixed window, and sliding window rate limiting
Caching Simulator
Explore 5 cache strategies and 4 eviction policies with request-flow visualization
Consistent Hashing
Visualize a hash ring, virtual nodes, and key distribution under topology change
Uptime SLA
Calculate SLA targets, nines of availability, and allowed downtime per year
Latency Simulator
Analyze p50, p95, and p99 latency percentiles and tail-latency distributions
Consensus / Raft
Watch leader election, log replication, and quorum as nodes join, crash, and recover
Circuit Breaker
See closed, open, and half-open states trip and recover as failures cross a threshold
Load Balancer
Compare round-robin, least-connections, weighted, and random across backend nodes
Queue / Backpressure
Push producers against a bounded buffer and watch drop, block, or overwrite under overload
SPREADSHEET TOOLS
GROUP_ID: XLSX_01
Excel Generator
Generate Excel files with fake sample data: choose tabs, rows, and column names with data types
Excel Splitter
Split a large Excel file into smaller files by rows or by tabs
Excel Merger
Merge multiple Excel files into one: combine into a single sheet or keep one sheet per file
AI SEO PROMPT TOOLS
GROUP_ID: SEO_01
SEO Content Brief Prompt Generator
Create a detailed AI prompt for SEO content briefs with intent, audience, outline, entities, and SERP guidance.
Blog Outline Prompt Generator
Generate a structured AI prompt for SEO-friendly blog outlines built around a keyword and audience.
Search Intent Analysis Prompt Generator
Build a prompt that asks AI to classify search intent, audience needs, SERP expectations, and content angle.
Keyword Cluster Prompt Generator
Create a prompt for grouping keyword lists into SEO clusters, pillar pages, supporting pages, and intent groups.
Meta Title & Description Prompt Generator
Generate a prompt for writing SEO meta titles and descriptions with variants, intent fit, and character discipline.
Content Refresh Prompt Generator
Create a prompt for refreshing old blog posts with new intent coverage, stronger sections, and SEO improvements.
FAQ & People Also Ask Prompt Generator
Generate a prompt for finding FAQ and People Also Ask style questions for SEO articles.