Free browser-side developer tools.
Browse Dev Atlas utilities by workflow. Current tools run locally in your browser and focus on fast debugging, encoding, decoding, formatting, generation, and conversion tasks.
Formatters
Clean up structured data, stylesheets, and code snippets.
Encoders
Encode and decode common web-safe text formats.
Inspectors
Inspect tokens, patterns, hashes, and schedules.
Available
JWT Decoder
Decode JWT header and payload locally, including issued-at and expiration timestamps.
NewRegex Tester
Test JavaScript regular expressions and inspect matches locally.
NewHash Generator
Generate MD5, SHA-1, and SHA-256 hashes from local text input.
NewCron Parser
Parse five-field cron expressions and preview upcoming runs.
Converters
Move between common data formats, time values, and colors.
Generators
Create development identifiers and fixture values.