Developer &amp; Data

HTML Formatter

Format or whitespace-minify bounded HTML locally for review.

HTTP Header Inspector

Parse HTTP headers and highlight common security and delivery controls.

JavaScript Formatter

Parse and format JavaScript locally without executing the source.

JWT Decoder

Inspect readable JWT header and payload claims without claiming signature verification.

JWT Expiry Checker

Explain JWT expiry and not-before timing against the current browser clock.

Markdown Preview

Render Markdown to a sanitized on-page preview and reviewable HTML source.

Markdown to HTML

Convert GitHub-flavoured Markdown to downloadable HTML without server processing.

Nano ID Generator

Generate bounded random IDs with selectable URL-safe, alphanumeric, or hexadecimal alphabets.

OpenAPI Example Generator

Generate one deterministic request or response example from an OpenAPI 3 operation.

Regex Tester

Run a bounded JavaScript regular expression and inspect matches, groups, and positions.

SQL Formatter

Format SQL for a selected dialect locally without connecting to or executing on a database.

URL Decoder

Decode percent-encoded URL component text and report malformed encoding clearly.