Dev Atlas
Free developer tools

Fast local utilities for everyday developer debugging.

Dev Atlas starts with practical browser-side tools for everyday development tasks. Paste data, inspect it, copy the result, and keep moving.

Format + validate

JSON Formatter

Format, minify, and validate JSON with readable parsing feedback for quick debugging.

Encode + decode

Base64 Encoder

Encode text to Base64 and decode Base64 strings locally in your browser.

URL safe

URL Encoder

Encode and decode URL components for query strings, paths, and debugging.

Local decode

JWT Decoder

Decode JWT header and payload locally, then inspect issued-at and expiration timestamps.

Generate IDs

UUID Generator

Generate random UUID v4 values for fixtures, test data, and local identifiers.

MD5 + SHA

Hash Generator

Generate MD5, SHA-1, and SHA-256 hashes from local text input.

Unix + ISO

Timestamp Converter

Convert Unix seconds, Unix milliseconds, ISO strings, local time, and UTC time.

Pattern test

Regex Tester

Test JavaScript regular expressions and inspect matches against sample text.

HEX + RGB + HSL

Color Converter

Convert common CSS color formats and preview the resulting color.