Ping
Basic public liveness check.
https://alpha-swan.duckdns.org/v1/free/ping
Public Free API
Developer Utility Surface
A lightweight collection of deterministic JSON utilities for text, time, URL, JSON, encoding, and hashing tasks. The current public release is designed to stay fast, predictable, and easy to verify from scripts or browsers.
Browse by category, copy an endpoint, and start with a direct request. The public free routes are intentionally narrow in scope and rate limited at the edge.
Core
Basic availability
Minimal public checks for a first request or a quick liveness probe.
Text
Extraction and normalization
Small text utilities for counts, extraction, deduplication, and clean slug output.
Slugify Text
Convert a phrase into a clean lowercase ASCII slug.
https://alpha-swan.duckdns.org/v1/free/text/slugify
Word Count
Return word, character, and line counts for a text block.
https://alpha-swan.duckdns.org/v1/free/text/word-count
Extract URLs
Pull HTTP and HTTPS links out of plain text.
https://alpha-swan.duckdns.org/v1/free/text/extract-urls
Extract Emails
Extract email-like addresses from plain text.
https://alpha-swan.duckdns.org/v1/free/text/extract-emails
Dedupe Lines
Remove duplicate lines while preserving the first occurrence.
https://alpha-swan.duckdns.org/v1/free/text/dedupe-lines
Time
UTC and timestamp helpers
Current UTC time, direct conversions, and a small timestamp difference utility.
Current UTC Time
Return current UTC time and a Unix epoch value.
https://alpha-swan.duckdns.org/v1/free/time/utc
Unix To UTC
Convert a Unix epoch into an RFC 3339 UTC timestamp.
https://alpha-swan.duckdns.org/v1/free/time/unix-to-utc
UTC To Unix
Convert an RFC 3339 timestamp into a Unix epoch value.
https://alpha-swan.duckdns.org/v1/free/time/utc-to-unix
Time Difference
Calculate minute and second differences between two timestamps.
https://alpha-swan.duckdns.org/v1/free/time/diff-minutes
JSON & Data
Formatting and validation
Simple helpers for validating JSON, making it readable, or compacting it for transport.
Pretty JSON
Pretty-print valid JSON with configurable indentation.
https://alpha-swan.duckdns.org/v1/free/json/pretty
Minify JSON
Collapse valid JSON into a compact single-line form.
https://alpha-swan.duckdns.org/v1/free/json/minify
Validate JSON
Check whether JSON is valid and report the top-level type or error location.
https://alpha-swan.duckdns.org/v1/free/json/validate
Encoding & Hashing
String encoding helpers
Deterministic helpers for SHA-256 and Base64 work.
SHA-256 Hash
Return the SHA-256 hex digest for a string.
https://alpha-swan.duckdns.org/v1/free/hash/sha256
Base64 Encode
Encode UTF-8 text as Base64 or URL-safe Base64.
https://alpha-swan.duckdns.org/v1/free/encoding/base64-encode
Base64 Decode
Decode Base64 text back into UTF-8.
https://alpha-swan.duckdns.org/v1/free/encoding/base64-decode
URL & Web
URL inspection
Inspect URL components or apply a basic normalization pass.
Parse URL
Split a URL into components and query parameters.
https://alpha-swan.duckdns.org/v1/free/url/parse
Normalize URL
Lowercase scheme and host, remove default ports, and optionally drop fragments.
https://alpha-swan.duckdns.org/v1/free/url/normalize
Quickstart
Start with a few direct calls. Everything below is public, free to test, and grouped to match the site categories above.
curl https://alpha-swan.duckdns.org/v1/free/ping
curl https://alpha-swan.duckdns.org/v1/free/time/utc
curl -X POST https://alpha-swan.duckdns.org/v1/free/text/extract-emails \
-H "Content-Type: application/json" \
-d '{"text":"Email ops@example.com and admin@example.org"}'curl -X POST https://alpha-swan.duckdns.org/v1/free/json/validate \
-H "Content-Type: application/json" \
-d '{"text":"{\"service\":\"utility-api\",\"free\":true}"}'curl -X POST https://alpha-swan.duckdns.org/v1/free/url/parse \
-H "Content-Type: application/json" \
-d '{"url":"https://example.com/docs?q=one&q=two#frag"}'The full machine-readable contract is available in the OpenAPI reference linked above.