Developer Tools
The small tools you reach for many times a day: pretty-print a JSON response, test a regular expression, generate a UUID, or compare two versions of a file with a diff.
There are also playgrounds for SQL and jq, a cron expression explainer, mock data and Dockerfile generators, and prompt and LLM utilities for working with AI models.
32 Developer Tools
CSV Viewer
Parse and display CSV data in a table format.
Developer ToolsDockerfile Builder
Visually create and edit Dockerfiles without writing code.
Developer Toolsjq Playground
A playground for the jq command-line JSON processor.
Developer ToolsJSON Formatter
Format, validate, and beautify your JSON data.
Developer ToolsLLM Model Explorer
Browse and compare features of different Large Language Models.
Developer ToolsMCP Config Generator
Generate Model Context Protocol (MCP) server configs for Claude Desktop, Claude Code, Cursor, VSCode, and Windsurf.
Developer ToolsMock Data Generator
Create realistic mock data by type or from a schema using AI.
Developer ToolsPrompt Library
A collection of curated, optimized prompts for various LLM tasks.
Developer ToolsPrompt Optimizer
Refine and shorten your LLM prompts with AI to reduce token usage.
Developer ToolsQR Code Generator
Generate QR codes from text or URLs.
Developer ToolsRegex Tester
Test and debug regular expressions, with AI assistance.
Developer ToolsSQL Playground
Run SQL queries against CSV data directly in your browser.
Developer Tools.gitignore Generator
Combine language, framework, editor and OS templates into one .gitignore file.
Developer ToolsAgent Wallet Simulator
Give AI agents a fake-money wallet with spend limits and approvals, then watch every transaction live. No real money.
Developer ToolsCoin Flip & Dice Roll
Quickly generate a random result for a coin flip or a dice roll.
Developer ToolsCredit Card Generator
Generate valid test credit card numbers.
Developer ToolsCron Job Explainer
Translate cron schedule strings into human-readable descriptions.
Developer ToolsFolder Map Generator
Select a folder to generate a text-based tree map of its contents.
Developer ToolsGrok Debugger
Parse and debug Grok patterns against log data.
Developer ToolsHTML, CSS & JavaScript Formatter and Minifier
Beautify or minify HTML, CSS and JavaScript (plus SCSS, Less and TypeScript formatting) with size and gzip savings shown.
Developer ToolsJSON Modifier
Selectively filter keys from a JSON object.
Developer ToolsJSON Schema Validator & Generator
Validate JSON against a JSON Schema with every error listed by path, or generate a schema from sample JSON.
Developer ToolsJSON Structural Diff
Compare two JSON documents by their data, not their formatting: added, removed and changed keys, with key order and whitespace ignored.
Developer ToolsLLM API Cost Calculator
Estimate and compare AI API costs across GPT, Claude, Gemini and more.
Developer ToolsMeta Tags Generator
Generate HTML meta tags for SEO and social media sharing.
Developer ToolsNumber Picker Wheel
A spinning wheel to pick a random number from a range.
Developer ToolsSemVer Comparator & Range Checker
Compare two semantic versions to see which is newer, or check whether a version satisfies an npm-style range like ^1.2.3 or >=1.0.0 <2.0.0.
Developer ToolsSQL Formatter
Format and beautify your SQL queries.
Developer ToolsText Embedding Generator
Generate vector embeddings for text and compare semantic similarity.
Developer ToolsUTM URL Generator
Build campaign URLs with UTM parameters for Google Analytics and other analytics tools.
Developer ToolsUUID Generator
Generate universally unique identifiers.
Developer ToolsWebcam & Microphone Test
Check your camera, microphone and speakers before a call: live preview, resolution and frame rate, mic level meter, live captions and speech-to-text.
Developer Tools