JSON, YAML & Developer Tools That Don't Suck
44 tools for JSON, YAML, encoding, regex, DevOps, and more. Fast. Clean. Free.
100% free. No accounts. No limits. Runs entirely in your browser.
JSON
11 toolsJSON Formatter
Beautify, minify, and format JSON with syntax highlighting.
JSON Tree Viewer
Explore JSON as a collapsible tree with color-coded values and path copying.
JSON Validator
Validate JSON and see exactly where errors are.
JSON ↔ YAML
Convert between JSON and YAML instantly.
JSON ↔ CSV
Convert flat JSON arrays to CSV and back.
JSON ↔ TOML
Convert between JSON and TOML formats.
JSON Diff
Compare two JSON objects and see what changed.
YAML Validator
Validate YAML syntax and catch indentation errors before they break your pipeline.
JSONPath Tester
Test JSONPath expressions against JSON data with dot notation, wildcards, and recursive descent.
JSON Schema Generator
Generate a JSON Schema from any JSON object with type inference and nested support.
JSON to TypeScript
Generate TypeScript interfaces from JSON data. Handles nested objects, arrays, nullable fields.
Encode / Decode
6 toolsBase64
Encode and decode Base64 strings.
URL Encode
Encode and decode URL-encoded strings.
HTML Entities
Encode and decode HTML entities. Named and numeric entity support.
JWT Decoder
Decode JWT tokens and inspect header and payload.
ASCII Table
Look up ASCII and Unicode code points. See decimal, hex, octal, binary, and HTML entities for any character.
String Escape
Escape and unescape strings for JSON, JavaScript, HTML, URL, and Unicode.
Code
11 toolsRegex Tester
Test regular expressions with live matching and group extraction.
SQL Formatter
Format, beautify, and minify SQL with dialect support.
Tailwind v3 → v4
Convert tailwind.config.js to Tailwind 4 @theme CSS syntax.
HTML Formatter
Beautify or minify HTML with proper indentation and tag detection.
CSS Minifier
Minify CSS for production or beautify compressed CSS for debugging.
JS/TS Formatter
Beautify or minify JavaScript and TypeScript with configurable indentation.
OG Tag Preview
Preview how your page looks on Google, Facebook, Twitter/X, and LinkedIn.
Markdown Preview
Write or paste Markdown and see the rendered output side by side.
XML Tools
Format, beautify, minify XML and convert between XML and JSON.
CSS Minifier
Minify CSS for production. Removes comments, collapses whitespace, shows compression ratio.
JS Minifier
Minify JavaScript for production. Strips comments, collapses whitespace, preserves strings.
DevOps
9 toolsChmod Calculator
Visual Unix permission calculator. Toggle read, write, and execute for owner, group, and other.
Cron Generator
Build, explain, and test cron expressions with a visual builder.
Docker Compose
Build docker-compose.yml files visually with service templates and live YAML preview.
.env Toolkit
Parse, validate, diff, and convert .env files. Generate .env.example, export to Docker/K8s.
HTTP Header Analyzer
Analyze HTTP headers for security issues, caching behavior, and CORS configuration with fix snippets.
Git Commands
Search, build, and copy Git commands with workflow templates.
CSP Builder
Build and analyze Content-Security-Policy headers visually. Generate directives, detect security issues.
IP / CIDR Calculator
Calculate subnets, host ranges, and masks for IPv4 CIDR notation with visual binary breakdown.
Mermaid Editor
Create flowcharts, sequence diagrams, and more with live preview.
AI
1 toolsText
3 toolsLorem Generator
Generate Lorem Ipsum and placeholder text. Customize paragraphs, sentences, or words. Output as plain text, HTML, or Markdown.
Text Diff
Compare two text blocks side by side and see additions, deletions, and changes highlighted.
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, and more.
Converters
7 toolsEpoch Converter
Convert Unix timestamps to human-readable dates and back. Auto-detects seconds vs milliseconds.
Color Converter
Convert between HEX, RGB, HSL, and HSB with contrast checker and shade generator.
UUID & Hash
Generate UUID v4 identifiers and compute SHA hashes from text.
Number Base Converter
Convert numbers between decimal, binary, hexadecimal, and octal.
QR Code Generator
Generate QR codes for URLs, WiFi, email, phone, SMS, and vCards. Download as PNG or SVG.
Date Formatter
Convert dates between ISO 8601, RFC 2822, SQL, Unix timestamps, and custom format strings with timezone support.
Dummy Data Generator
Generate realistic fake data in JSON, CSV, SQL INSERT, or TypeScript. Custom schemas and presets.
New tools, regularly
Get notified when we add to the toolkit. No spam, unsubscribe anytime.
Built by a developer, for developers
I got tired of janky online JSON tools that were slow, ad-filled, or sent my data to third-party servers. So I built one that runs entirely in your browser — fast, private, and free.
— Shane Burrell · [email protected]
From the makers of JSON Knife