Web & Dev
JSON, Base64, URL encoders and developer utilities.
Describe what you need and AI finds the right tool instantly.
Encode or decode Base64 strings.
Encode and decode URL components.
Beautify and validate JSON instantly.
Live JavaScript regex tester with match highlighting and flags.
Generate any number of cryptographically random RFC 4122 v4 UUIDs.
In-browser REST client: send GET/POST/PUT/PATCH/DELETE with custom headers and body.
Validate any JSON string and surface parse errors with line context.
Diff two JSON documents and see added, removed and changed keys.
Resolve a JSONPath expression against any JSON document.
Pretty-print and indent any XML document.
Validate XML well-formedness using the browser DOMParser.
Reformat and validate YAML with consistent indentation.
Check YAML syntax and surface errors instantly.
Strip whitespace and comments from HTML to shrink page size.
Compress CSS by removing whitespace, comments and trailing semicolons.
Strip comments and whitespace from JS source for smaller bundles.
Beautify SQL by breaking clauses onto new lines.
Alias of SQL Formatter — clause-aware SQL prettifier.
Generate scannable QR codes for any URL or text and download as PNG.
Render Markdown to HTML live with side-by-side preview.
Build and describe 5-field cron expressions visually.
Convert CSV with a header row into a JSON array of objects.
Convert a JSON array of objects into a CSV table.
Serialize a JSON document into nested XML elements.
Parse XML and emit a JSON structure of the document tree.
Line-by-line diff between two code snippets with +/- markers.
Look up the MIME content-type for any file extension.
Parse a User-Agent string into browser, OS and device class.
Auto-indent source code with brace-aware formatting.
Parse and align an HTTP header block for easy inspection.
Encode text to Base64 with UTF-8 support.
Decode Base64 strings back to UTF-8 text.
Decode percent-encoded URL components into readable text.
Send REST requests and inspect the response — alias of API Tester.
Decode any QR code from an image — see exactly what it contains before you trust it.