~/dev-helper — tools for devs

Open and use.
Nothing to install.

CPF, CNPJ, JSON, SQL, passwords, addresses and more — generated and validated on the spot, ready to copy.

CPF / CNPJ JSON JWT UUID PIX

Available tools

Documents & Location

CPF / CNPJ Generates and validates CPF and CNPJ, with check digit CEP (ZIP Code) Generates plausible Brazilian ZIP codes and validates the format Address Generates fictitious addresses from several countries

Finance

Card Generates and validates card numbers (Luhn) Bank Account Generates fictitious bank account data Currency Converter Converts currencies using rates you define Contractor vs Employee Salary Compares total annual pay between contractor and employee PIX Copy and Paste Generates PIX code (BR Code) and QR Code

Text & Data

JSON Formats, minifies and validates JSON SQL Indents and formats SQL queries CSV ↔ JSON Converts CSV to JSON and JSON to CSV YAML ↔ JSON Converts YAML to JSON and JSON to YAML JSON to TypeScript Generates TypeScript interfaces from a JSON Text Diff Compares two texts and highlights differences Markdown Editor Write Markdown with live preview Regex Tester Tests regex and highlights matches and groups Character Counter Counts characters, words, lines and paragraphs Fake Data / Mock JSON Generates a JSON array of mock objects Project Scope Generates a project scope document in Markdown XML Formats, minifies and validates XML syntax

Security & Encoding

Password Generates secure passwords in the browser Hash Generator Generates MD5, SHA-1, SHA-256, SHA-384 and SHA-512 JWT Decoder Decodes header and payload of JWT tokens UUID Generator Generates random v4 UUIDs in the browser Base64 / URL Encodes and decodes Base64 and URL

Web, Network & Automation

CIDR Calculator Calculates network, broadcast, hosts and mask Cron Builder Explains cron expressions and shows next run times Unix Timestamp Converts date and Unix timestamp both ways Timezone Converter Converts times between timezones around the world QR Code Generator Generates a QR Code from text or URL and downloads as PNG Meta Tags Generator Generates Open Graph and Twitter Card with preview .gitignore Generator Builds a .gitignore combining languages and tools Hours Worked Calculates hours worked, lunch break and shift balance

Converters & Design

Case Converter Converts text between camelCase, snake_case… Numeral System Converter Converts between binary, octal, decimal and hexadecimal Color + WCAG Contrast Converts HEX/RGB/HSL and checks WCAG contrast CSS Gradient Generator Creates linear and radial CSS gradients with preview