# Developer Utilities > Online utilities for developers: JSON/YAML formatters, regex testers, encoders, JWT decoders, converters, multi-tool developer toolboxes. - Parent category: [Developer Tools](https://devshelf.io/category/developer-tools.md) - DevShelf page: https://devshelf.io/category/developer-utilities ## Resources (41) - [1.tools](https://devshelf.io/resource/1-tools.md): Collection of open-source useful developer tools, converters, encoders, and generators running entirely client-side in the browser. (pricing: Free) - [3STF Tools](https://devshelf.io/resource/3stf-tools.md): A growing collection of free, client-side developer, text, and productivity tools that run entirely in your browser with zero data tracking. (pricing: Freemium) - [A Box of Tools](https://devshelf.io/resource/a-box-of-tools.md): A collection of client-side developer and utility tools that run entirely in the browser without sending files or data to any external server. (pricing: Free) - [Badgen](https://devshelf.io/resource/badgen.md): Fast badge generating service for software projects and documentation. (pricing: Free) - [Cert Decoder](https://devshelf.io/resource/cert-decoder.md): A browser-based tool to decode and inspect X.509 certificates in PEM format, extracting details like issuer, subject, and validity. (pricing: Free) - [CoderTools](https://devshelf.io/resource/codertools.md): A comprehensive suite of browser-based developer utilities for code formatting, cryptography, data conversion, and system testing. (pricing: Free) - [Cryptii](https://devshelf.io/resource/cryptii.md): Browser-based web application for modular conversion, encoding, and encryption without server interaction. (pricing: Free) - [CSS Button Maker](https://devshelf.io/resource/css-button-maker.md): A web-based visual generator for creating custom CSS button styles with real-time preview and code export. (pricing: Free) - [csv.repair](https://devshelf.io/resource/csv-repair.md): Browser-based utility for analyzing, querying with SQL, diagnosing, and repairing broken CSV files online. (pricing: Free) - [CyberChef](https://devshelf.io/resource/cyberchef.md): Web-based application for encryption, encoding, compression, and data analysis operations. (pricing: Free) - [favicondl](https://devshelf.io/resource/favicondl.md): Extract website favicons in multiple formats and sizes by providing a domain or URL. Supports SVG, PNG, ICO, and Apple touch icons with API access. (pricing: Free) - [Fmtly](https://devshelf.io/resource/fmtly.md): An open source browser-based collection of developer utilities including JSON, XML, YAML, CSV and TOML formatters, validators, and encoders. (pricing: Free) - [Format JSON Online](https://devshelf.io/resource/format-json-online.md): A browser-based toolkit for formatting, validating, minifying, and converting JSON data locally. (pricing: Free) - [HappyFormatter](https://devshelf.io/resource/happyformatter.md): A private, client-side code formatter and minifier running entirely in the browser without uploading code. (pricing: Free) - [IT Tools](https://devshelf.io/resource/it-tools.md): Collection of handy online tools for developers, including cryptography, conversion, web, and network utilities. (pricing: Free) - [JSON Crack](https://devshelf.io/resource/json-crack.md): Online tool to visualize, format, and convert JSON, YAML, CSV, and XML data into interactive graph trees. (pricing: not verified) - [JSONing](https://devshelf.io/resource/jsoning.md): A collection of tools and resources for working with JSON, JSONL, and JSONPath data formats. (pricing: Free) - [JWT.io](https://devshelf.io/resource/jwt-io.md): JSON Web Tokens decoder, verifier, and generator tool for web applications. (pricing: Free) - [Layoutit Grid](https://devshelf.io/resource/layoutit-grid.md): A visual CSS Grid generator that allows users to interactively define grid layouts and export the corresponding HTML and CSS code. (pricing: Free) - [Mockium](https://devshelf.io/resource/mockium.md): An online tool for generating synthetic test datasets in CSV, SQL, and JSON formats with customizable field schemas. (pricing: Free) - [Mr. Data Converter](https://devshelf.io/resource/mr-data-converter.md): Convert spreadsheet data from Excel or CSV formats into web-friendly formats including JSON, HTML, and XML. (pricing: Free) - [npmgraph](https://devshelf.io/resource/npmgraph.md): Web-based visualization tool for exploring and analyzing npm package dependency trees. (pricing: Free) - [Nutilz](https://devshelf.io/resource/nutilz.md): A comprehensive web collection of over 680 free, client-side developer, PDF, image, text, and calculator utilities requiring no sign-up. (pricing: Free) - [OmniTools](https://devshelf.io/resource/omnitools.md): An open-source collection of developer utilities and tools hosted on GitHub. (pricing: Free) - [Online Tools](https://devshelf.io/resource/online-tools.md): A comprehensive web-based collection of developer utilities for hashing, cryptography, compression, encoding, formatting, and text conversion. (pricing: Free) - [Patterns.page](https://devshelf.io/resource/patterns-page.md): A collection of browser-based CSS generators for creating gradients, shadows, filters, transforms, borders, patterns, and grid layouts. (pricing: Free) - [PHPHub](https://devshelf.io/resource/phphub.md): A collection of online utilities designed to aid in PHP development and make coding smoother and more efficient. (pricing: Free) - [Pythonium](https://devshelf.io/resource/pythonium.md): A collection of browser-based online tools and resources designed to assist Python developers with various coding tasks. (pricing: Free) - [regex101](https://devshelf.io/resource/regex101.md): Online tool to build, test, and debug regular expressions with real-time explanations, match information, and quick reference guides. (pricing: Freemium) - [RegExr](https://devshelf.io/resource/regexr.md): Online tool to learn, build, and test Regular Expressions for JavaScript and PHP/PCRE with real-time results and reference documentation. (pricing: Free) - [Shields.io](https://devshelf.io/resource/shields-io.md): Concise, consistent, and legible badge generator for software projects, documentation, and repositories supporting hundreds of external services. (pricing: Free) - [SQLable](https://devshelf.io/resource/sqlable.md): A collection of web-based utilities designed to simplify SQL database management, including formatters, validators, and data generators. (pricing: Free) - [SvgPathEditor](https://devshelf.io/resource/svg-path-editor.md): A web-based tool to visually edit, transform, scale, rotate, and optimize SVG path data commands directly in the browser. (pricing: Free) - [Table Format Converter](https://devshelf.io/resource/table-format-converter.md): Convert tabular data between CSV, HTML, JSON, and Markdown formats instantly online with local processing for enhanced privacy. (pricing: Free) - [ToolKit](https://devshelf.io/resource/toolkit.md): Collection of browser-based utilities including password generators, text tools, color palettes, and JSON formatters. (pricing: Free) - [Transform](https://devshelf.io/resource/transform.md): A web-based polyglot code and data transformation tool for converting between various formats such as JSON, TypeScript, GraphQL, CSS, and SVG. (pricing: Free) - [Unicon](https://devshelf.io/resource/unicon.md): Browser-based tool to convert any unicode symbol, emoji, or glyph into a favicon in PNG, ICO, or SVG formats. (pricing: Free) - [ViewJSON](https://devshelf.io/resource/viewjson.md): JSON editor and viewer that automatically detects and renders Base64-encoded images, audio, video, and PDF data inline without manual decoding. (pricing: Free) - [Web Code Tools](https://devshelf.io/resource/web-code-tools.md): Collection of web development code generators for CSS, HTML, structured data, meta tags, Open Graph, Twitter cards, and robots.txt. (pricing: Free) - [Webacus](https://devshelf.io/resource/webacus.md): A collection of unified development tools for encoding, compression, formatting, hashing, serialization, and cryptography with local-first storage. (pricing: Freemium) - [YAMLine](https://devshelf.io/resource/yamline.md): A collection of web-based utilities for parsing, formatting, converting, validating, and comparing YAML data structures and configuration files. (pricing: Free) --- Source: DevShelf.io, the hand-reviewed catalog of dev tools and resources. Every resource is reviewed by hand before it is listed.