Developer Tools
109 tools available. All free, all private.
Format, validate, convert, and analyze code and data formats. From JSON formatting to Base64 encoding, regex testing to JWT decoding — every developer tool runs instantly in your browser with zero server calls.
When to Use Developer Tools
- Formatting and validating JSON, XML, HTML, CSS, SQL
- Converting between data formats (JSON ↔ CSV, YAML, XML)
- Encoding and decoding Base64, URL strings, HTML entities
- Testing regular expressions with real-time matches
- Generating UUIDs, hashes, and security tokens
Popular Developer Tools
URL Encoder/Decoder
Encode and decode URLs and URI components instantly
UUID Generator
Generate cryptographically secure UUIDs with batch mode and formatting options
Hash Generator MD5/SHA
Generate and compare MD5, SHA-1, SHA-256, SHA-512 hashes instantly
Color Converter HEX/RGB/HSL
Convert colors between HEX, RGB, HSL, and CMYK with live preview
Regex Tester
Test regular expressions with live highlighting, groups, and replace mode
CSV to JSON
Convert CSV to JSON with auto-delimiter detection and pretty-print output
JSON to CSV
Convert JSON arrays to CSV with nested object flattening
JWT Decoder
Decode JWT tokens to inspect header, payload, and expiration status
HTTP Status Codes Reference
Complete HTTP status codes reference — categorized, searchable, click to copy
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words
JSON Minifier
Minify JSON by removing whitespace with size savings display
HTML Entity Encoder
Encode and decode HTML entities with reference table
Number Base Converter
Convert numbers between binary, octal, decimal, hex, and custom bases
Cron Expression Parser
Parse cron expressions with human-readable output and next run times
XML to JSON
Convert XML to JSON with attribute handling and pretty-print output
XML Formatter
Format, beautify, and minify XML with validation
HTML Formatter
Format and beautify HTML with custom indentation
HTML Minifier
Minify HTML by removing comments and collapsing whitespace
SQL Formatter
Format SQL queries with uppercase keywords and proper indentation
Diff Checker
Compare two texts side by side with diff highlighting
Markdown Editor & Preview
Write Markdown with live preview, toolbar, and HTML export
JSON to YAML
Convert JSON to YAML with proper indentation and nesting
YAML to JSON
Convert YAML to pretty-printed JSON
CSS Formatter
Format and beautify CSS with custom indentation
CSS Minifier
Minify CSS by removing comments and whitespace
JS Formatter
Format and beautify JavaScript with proper indentation
JS Minifier
Minify JavaScript by removing comments and whitespace
Markdown to HTML
Convert Markdown to HTML with full syntax support
JSON to XML
Convert JSON to XML — nested objects and arrays supported
YAML Validator
Validate YAML syntax with error messages and line numbers
HTML to Markdown
Convert HTML to clean Markdown — all elements supported
HTML to Text
Strip HTML tags — convert to clean plain text
URL Parser
Parse URLs into components — edit and reconstruct
Markdown Table Generator
Create Markdown tables visually — alignment and preview
HTML Live Preview
Write HTML with live preview — sandboxed and real-time
JSON to TypeScript
Generate TypeScript interfaces from JSON — nested support
CSV to XML
Convert CSV to XML — custom elements and delimiters
XML to CSV
Convert XML to CSV — auto-extract records and headers
XML Validator
Validate XML syntax — error details and pretty-print
HTML Validator
Check HTML for common issues — errors and warnings
SQL Minifier
Minify SQL — remove comments and whitespace
JWT Generator
Generate JWT tokens — HMAC-SHA256 with color-coded parts
Cron Expression Generator
Build cron expressions visually — presets and descriptions
HMAC Generator
Generate HMAC hashes — SHA-256, SHA-512 with Web Crypto
MIME Types Reference
Searchable MIME types reference — filter and copy
Dummy JSON Generator
Generate dummy JSON data — configurable fields for testing
CSV Formatter
Format CSV data — table preview with stats
User Agent Parser
Parse user agents — browser, OS, device detection
IP Info Viewer
View your IP address and browser info
Mock API Response Generator
Generate mock API responses — custom status, headers, body
CSS to Tailwind
Convert CSS to Tailwind classes — instant conversion
JSON to Zod Schema
Generate Zod schemas from JSON — TypeScript validation
.env File Parser
Parse .env files — structured view with JSON export
JSON Path Tester
Test JSONPath expressions — query JSON data interactively
JSON Schema Validator
Validate JSON against schema — type, required, enum & more
JSON Diff
Compare JSON objects — see added, removed, and changed values
YAML to XML
Convert YAML to XML — nested objects and arrays
DNS Lookup
Look up DNS records — A, AAAA, MX, TXT, NS, CNAME
ULID Generator
Generate ULIDs — sortable, unique, Crockford Base32
Nano ID Generator
Generate Nano IDs — compact, URL-safe, customizable
Color System Generator
Generate a full color system from one color
CSS Specificity Calculator
Calculate and compare CSS specificity
cURL to Code Converter
Convert cURL to any programming language
Git Commit Message Generator
Generate conventional commit messages
.gitignore Generator
Generate .gitignore for any tech stack
.htaccess Generator
Generate .htaccess rules for Apache
INI to JSON Converter
Convert INI config files to JSON
JSON to C# Converter
Generate C# classes from JSON
JSON to Go Converter
Generate Go structs from JSON
JSON to Java Converter
Generate Java POJOs from JSON
JSON to Kotlin Converter
Generate Kotlin data classes from JSON
JSON to PHP Converter
Generate PHP classes from JSON
JSON to Python Converter
Generate Python dataclasses from JSON
JSON to Rust Converter
Generate Rust structs from JSON
JSON to SQL Converter
Convert JSON to SQL INSERT statements
JSON to Swift Converter
Generate Swift Codable structs from JSON
Nginx Config Generator
Generate Nginx configuration files
OpenAPI Validator
Validate OpenAPI and Swagger specs
package.json Generator
Generate package.json files
README Generator
Generate professional README files
Regex Explainer
Get human-readable explanations of regex
TOML to JSON Converter
Convert TOML to JSON
API Header Parser
Parse and analyze HTTP headers
ASCII Table
Complete ASCII character reference
Chmod Calculator
Calculate Unix file permissions
Color Name Lookup
Find the closest CSS color name
Docker Compose Validator
Validate Docker Compose files
Dockerfile Generator
Generate production-ready Dockerfiles
Epoch Converter
Convert epoch timestamps and dates
GraphQL Formatter
Format and beautify GraphQL
GraphQL to TypeScript
Convert GraphQL schemas to TypeScript
IP Subnet Calculator
Calculate IP subnets and CIDR
SSH Key Generator
Generate SSH key pairs in-browser
TypeScript Playground
TypeScript to JavaScript in real time
Webhook Tester
Test and inspect webhook requests
YAML Formatter
Format and beautify YAML
License Generator
Generate open-source license files instantly
Placeholder Image Generator
Generate custom placeholder images instantly
Code to Image
Turn code into beautiful shareable images
Email Validator
Validate email format and MX records instantly
DNS Propagation Checker
Check DNS propagation across global resolvers
PWA Manifest Generator
Build PWA manifest.json files with live preview
Vibe Coding Prompt Builder
Build perfect prompts for AI coding assistants
Markdown to Notion
Convert Markdown to Notion block JSON
Token Counter
Count tokens and estimate LLM API costs
Mermaid Diagram Generator
Write Mermaid syntax, render diagrams live