C Programming
C Programming
Guides, references and tools
Everything in the C Programming section, organized by topic.
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DTData Types ExExamples FuFunctions OpOperators TNThings Not To Do VaVariables
Python
Python
Guides, references and tools
Everything in the Python section, organized by topic.
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FuFunctions SSSequence Slicing StString
SQL
SQL
Guides, references and tools
Everything in the SQL section, organized by topic.
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ClClause
Tools
Tools
Guides, references and tools
Everything in the Tools section, organized by topic.
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BaBase64 CMCss Minifier HEHtml Encoder HMHtml Minifier JBJs Beautifier JMJs Minifier JFJson Formatter JJJson Js JTJson Tree JXJson Xml JDJwt Decoder UEUrl Encoder UGUuid Generator YJYaml Json
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Tools

Client-side developer utilities. Each category below has its own widget with context and stats.

14Tools

5Categories

0msServer

JSON Tools5

JSON Formatter / Validator

Format, validate, and minify JSON online. Pretty-print with 2 or 4 spaces or tabs, sort keys, escape unicode, and catch syntax errors — all client-side.

JSON ↔ JavaScript Object Converter

Convert JSON to a JavaScript object literal, or a JS object back to JSON. Client-side, keyboard-first, with quote and indent options.

JSON Tree Viewer

Interactive JSON tree viewer with live parse, search, expand/collapse-all, and type-colored values. Client-side.

JSON ↔ XML ConverterConverters

Convert JSON to XML and back, in your browser. Powered by xml2js. Live output with indent, root name, and attribute-handling options.

YAML ↔ JSON ConverterConverters

Convert YAML to JSON and back, in your browser. Powered by js-yaml. Live output, indent and inline-flow control.

Encoders3

Base64 Encoder / Decoder

Fast Base64 encoder and decoder. UTF-8 safe, runs entirely in your browser, no data sent to any server. Copy to clipboard, works offline.

HTML Encoder / Decoder

Encode and decode HTML entities in your browser. Handles the five special characters plus optional non-ASCII (named, decimal, or hex).

URL Encoder / Decoder

Encode or decode URL text in your browser. Three modes: component, full URI, and form-urlencoded. Live output.

Formatters & Minifiers2

JavaScript Beautifier

Beautify minified JavaScript in your browser. Restore whitespace, indentation, and line breaks. Powered by js-beautify.

JavaScript Minifier

Minify JavaScript in your browser. Terser under the hood, with mangling, compression, drop-console, and comment options.

Tools3

CSS MinifierFormatters

Minify CSS in your browser with csso. AST-based optimization, not just regex — merges duplicate selectors, optimizes shorthand, preserves variables.

JWT DecoderEncoders

Decode JSON Web Tokens in your browser. Inspect header, payload, and signature. Verify HS256/384/512 with a shared secret. Client-side.

UUID / ULID GeneratorGenerators

Generate UUID v4, UUID v7, or ULID identifiers in bulk. Cryptographically secure, client-side. Copy all or download.

HTML Tools1

HTML MinifierFormatters

Minify HTML in your browser. Strips whitespace, comments, and unnecessary quotes. Can minify inline CSS and JS too.