Developer Tools

67 free tools

Format JSON, decode JWT, generate UUIDs & hashes, test regex, convert bases -- your client-side dev swiss knife.

9

Code Formatters & Beautifiers

Format, beautify and minify JSON, CSS, JS, SQL, YAML, XML and more.

JSON FormatterMarkdown PreviewCSS Minifier & Beautifier
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8

Code Converters

Convert between JSON, CSV, YAML, TOML, TypeScript and other formats.

Number Base ConverterJSON to CSVJSON ↔ YAML Converter
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7

Encoders & Decoders

Base64, URL, HTML entities, JWT, binary, X.509 and string escape.

Base64 Encode / DecodeURL Encode / DecodeJWT Decoder
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16

Code Generators

Generate UUIDs, hashes, SSH keys, .gitignore, README, Dockerfile and more.

UUID GeneratorHash GeneratorHMAC Generator
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27

Validators & Network

Regex tester, JSON schema, HTTP status, IP subnet, email, credit card validators.

Regex TesterCron Expression ParserHTTP Status Codes Reference
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Why Use Our Client-Side Developer Tools?

Every tool in this collection runs entirely in your browser using JavaScript and Web APIs. Nothing is uploaded to any server, which means your source code, API keys, JWT tokens, and sensitive data never leave your device.

Unlike server-based alternatives, our developer tools work offline once loaded. Format JSON on a plane, decode JWTs on a train, or generate UUIDs without an internet connection. The only thing you need is a modern browser.

Speed is a core advantage. There is no server round-trip, no upload queue, and no processing delay. Results appear instantly as you type, making these tools ideal for rapid prototyping and debugging sessions.

Frequently Asked Questions