Developer Tools

Essential tools for software developers

13 tools

A swiss-army knife for developers: test regular expressions with live matches, pretty-print and validate JSON, minify or beautify code, inspect JWTs, diff files and more — all without leaving the browser.

JSON Formatter

Format and minify JSON data. Syntax highlighting and one-click access to the JSON Validator for error detection.

JSON Validator

Validate JSON with invisible character detection and detailed error explanations.

JWT Decoder

Decode and inspect JSON Web Tokens. View header, payload, and signature information.

UUID Generator

Generate random UUIDs (v4). Create single or multiple unique identifiers instantly.

QR Code Generator

Generate downloadable QR codes from any URL or text. Export as SVG or PNG directly in your browser.

Regex Tester

Test regular expressions against text in real-time. See matches highlighted with capture groups.

Cron Expression Parser

Parse cron expressions and see the next scheduled run times. Supports standard 5-field cron syntax.

Chmod Calculator

Visual Unix permissions calculator. Select Read/Write/Execute for Owner, Group, and Others to get the numeric value and symbolic notation.

Diff Checker

Compare two texts and see the differences highlighted. Find additions, deletions, and changes.

Fake Data Generator

Generate realistic fake JSON data for testing and prototyping. Build a custom schema with names, emails, UUIDs, dates, and more — then generate as many rows as you need.

Markdown Table Generator

Create Markdown tables visually — add rows and columns, set alignment, and copy the Markdown output. Much easier than formatting pipes and dashes by hand.

JSON → TypeScript Interface

Generate TypeScript interfaces automatically from any JSON object. Handles nested objects, arrays, nullable values, and optional fields. Paste JSON and get ready-to-use TypeScript.

Code Screenshot

Turn any code snippet into a beautiful screenshot image. Choose theme (Dracula, VS Code, One Dark…), gradient background, font, line numbers, and window chrome. Export as PNG. 100% client-side.