Free Developer Tools
The small utilities that fill a developer's day — decode a JWT, preview Markdown, diff two files, convert a timestamp. These free developer tools run in your browser, so tokens and code never touch a server. No accounts, no limits.
JWT Decoder
Decode JWT header and payload.
Markdown Preview
Write Markdown and preview the HTML live.
GUID Generator
Generate random GUIDs / UUIDs in bulk.
HTTP Status Code Lookup
Search HTTP status codes and their meanings.
MIME Type Finder
Look up MIME types by file extension.
Cron Expression Generator
Build cron expressions with a plain-English preview.
User Agent Parser
Parse a user-agent string into browser, OS and device.
JavaScript Beautifier
Format and indent minified JavaScript.
JavaScript Minifier
Strip comments and whitespace from JavaScript.
Regex Generator
Ready-made regex patterns with explanations.
JWT Encoder
Build and sign an HS256 JSON Web Token.
HTTP Header Viewer
Inspect the raw HTTP response headers of any URL.
FAHAQ keeps every tool free with no paywalls. Donations help cover the servers and keep it fast and growing — even a couple of dollars makes a difference.
Developer tools — questions
Are these developer tools free?
Yes — every developer tool on FAHAQ is free, with no signup and no usage limits.
Is my data safe?
Yes. These tools run in your browser, so tokens, code and text never leave your device.