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Developer Tools

Free online formatters, encoders, decoders, and validators for everyday development. Format JSON, decode Base64, test regex patterns, inspect JWTs, and generate hashes — all in your browser with zero server processing.

JSON Formatter & Validator

Format, beautify, minify, and validate JSON data online. Instant error detection with line numbers.
Base64 Encoder / Decoder

Encode and decode Base64 strings online. Supports text and URL-safe Base64 encoding.
URL Encoder / Decoder

Encode and decode URL strings online. Supports full URL and component encoding.
JWT Decoder

Decode JSON Web Tokens and inspect header, payload, and expiration. No server-side processing.
Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text. Uses the Web Crypto API.
Regex Tester

Test regular expressions with live highlighting, match details, and capture group extraction.
UUID Generator

Generate UUID v4, v1, and v7 identifiers. Bulk generation, copy to clipboard, and optional hyphen removal.
Cron Expression Builder

Build cron expressions with a visual editor. See human-readable descriptions and the next 5 scheduled run times.
Password Generator

Generate strong, random passwords with configurable length, character sets, and strength indicator.
Diff Checker

Compare two blocks of text side by side. See added, removed, and unchanged lines with color highlighting.
YAML Formatter

Format, validate, and convert YAML. Beautify YAML, convert between YAML and JSON, and catch syntax errors.
CSV to JSON Converter

Convert CSV data to JSON with custom delimiters and header row detection. Copy the output with one click.
TOTP Generator

Generate time-based one-time passwords from a Base32 secret key. Live countdown timer and Web Crypto API powered.

About Developer Tools

Free online formatters, encoders, decoders, and validators for everyday development. Format JSON, decode Base64, test regex patterns, inspect JWTs, and generate hashes — all in your browser with zero server processing.