All tools

Developer Tools

Developer tools for quick checks, formatting, and request debugging.

Use these pages for the small jobs that interrupt real work: formatting JSON, testing an endpoint, decoding a value, or checking a pattern.

Format JSON Beautify and validate payloads

Test APIs Inspect requests and responses

Encode Data Work with Base64 and URLs

Check Patterns Test regex and debug matches

API Tester Popular Developer Tools JSON Formatter Popular Developer Tools Base64 Encoder / Decoder Popular Developer Tools UUID Generator Popular Developer Tools URL Encoder / Decoder Popular Developer Tools Color Picker Tool Popular Developer Tools Regex Tester Popular Developer Tools

Developer Tools

Popular Developer Tools

These tools cover the most common jobs in this section.

Request utility

Send HTTP requests from the browser with custom method, headers, and body, then inspect the response.

Developer utility

Format, validate, and prettify JSON directly in your browser.

Encoding utility

Encode plain text to Base64 or decode Base64 back to readable text.

Identifier utility

Generate random UUIDs for databases, testing, APIs, and application identifiers.

Web utility

Encode URLs safely for query strings or decode encoded URLs back to readable form.

Design utility

Pick colors visually and copy HEX, RGB, and HSL values instantly.

Testing utility

Test regular expressions against sample text and review matches in real time.