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Free online tools to generate, calculate,
convert, format, encode, and play.
 

Code Utils

Code formatting, analysis, and transformation tools for developers. Beautify, minify, explain, and debug code across multiple languages — all in your browser.

API Lorem Ipsum
Create realistic mock JSON and XML API responses with placeholder data for testing, prototyping, and development.
API Response
Parse, format, and inspect JSON and XML API responses with syntax highlighting, status code reference, and header analysis.
ASCII Table
Interactive ASCII table with search, filtering, and character lookup.
Code Bug Detector
Paste any code snippet to identify common bugs, potential errors, and code quality issues. Supports JavaScript, Python, Java, C, Go, Rust, and more.
Code Explanation
Paste any code snippet and get a clear, line-by-line breakdown of what it does. Supports all major programming languages.
Code Unminifier
Beautify and format minified JavaScript, CSS, HTML, and JSON code instantly in your browser. No data sent to any server.
CSS Beautifier
Free online CSS formatter, beautifier, and minifier. Format, indent, and prettify CSS code instantly in your browser. No data sent to any server.
Env Parser
Free online .env file parser and validator. Detect duplicate keys, validate syntax, and convert between .env, JSON, and YAML formats.
GraphQL Query
Free online GraphQL query formatter, beautifier, and minifier.
HTML Beautifier
Free online HTML formatter, beautifier, and minifier. Format, indent, and prettify HTML code instantly in your browser. No data sent to any server.
JS Beautifier
Free online JavaScript beautifier, formatter, and minifier. Format, indent, and prettify JavaScript code instantly in your browser.
JS keyCodes
JS keyCodes.
JSON Formatter
Free online JSON formatter, validator, and beautifier. Format, validate, minify, sort keys and prettify JSON data instantly in your browser.
JSONPath
Evaluate JSONPath expressions against JSON data and display matches. Includes a cheat sheet of common query patterns. Free online JSONPath tester.
JWT Decoder
Verify authentication, view claims, and extract payload details with this online JWT decoder tool.
Regex Library
Free online regex pattern library with copy-ready regular expressions for emails, URLs, dates, IPs, passwords, and more.
RegExp
Test regular expressions in real time with PCRE and POSIX ERE flavors.
Semver Compare
Compare semver versions, check range compatibility (^, ~, >=, <=, ||), and sort version lists.
Shader Playground
write and preview GLSL fragment shaders live in your browser using WebGL. Includes starter templates for gradients, noise, Mand...
SQL Beautifier
Free online SQL formatter, beautifier, and minifier. Format, indent, and prettify SQL queries instantly in your browser.
Syntax Highlight
This free online utility to highlight and colorize code.
Temporal Date Explorer
interactive playground for the JavaScript Temporal API. Parse, compare, and format dates and durations with live Temporal code output. Works entirely in...
TOML Formatter
Free online TOML formatter, validator, and minifier.
XML Beautifier
Free online XML formatter, validator, and beautifier. Format, validate, minify and prettify XML data instantly in your browser.

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