Can I convert curl commands to JavaScript fetch?

Yes. Paste a curl command and get fetch() or axios code with headers, methods, and multipart form fields preserved.

What does the cron expression generator do?

It builds five-field cron schedules with presets, human-readable descriptions, and a preview of the next five execution times in local or UTC.

Do API tools upload my snippets or data?

No. CURL conversion, regex testing, UUID generation, and timestamp conversion all run locally in your browser tab.

Free API Developer Tools — CURL Converter, Cron, Regex & UUID

Where API debugging meets everyday text utilities

Shipping an API means juggling identifiers, timestamps, structured logs, and release metadata. This API & data tools collection bundles the utilities that surface in every postmortem: a JavaScript regex tester for grokking malformed payloads, a UUID v4 generator for realistic sample data, a Unix timestamp converter for correlating incidents, and an XML sitemap generator for handing clean URL lists to SEO partners.

Each tool is intentionally small, fast, and offline-friendly after the first load. That keeps them useful inside restricted VPNs where engineers still need to diff a regex or explain why an epoch value lines up with a deploy window. Because the routes stay under the /tools/ namespace, you can bookmark this hub when onboarding teammates who should discover the cluster without hunting through unrelated Base64 utilities—though we still link back to the full directory for cross-cutting tasks.

From an SEO perspective, hubs like this let ToolMorph publish meaningful topical context: crawlers see category copy, internal links to each child tool, and breadcrumb lists that mirror the visual UI. When we add new API-focused utilities, they automatically inherit the same internal linking fabric, so organic growth does not require reworking site architecture.

Workflow ideas

Start from a failing log line: extract candidate tokens with regex, convert embedded epoch fields to human readable timestamps, mint fresh UUIDs for replay scripts, then regenerate a sitemap slice if marketing needs a fast Search Console refresh after a launch.

Tools in this collection

XML Sitemap Generator

Paste canonical URLs (one per line), apply sensible defaults, and download sitemap.xml. Duplicates normalize away, optional lastmod helps crawlers prioritize fresh pages.

Regex Tester

JavaScript-compatible regex with instant highlighting. Invalid patterns show a readable error; copy pattern, sample text, or all matches.

UUID Generator

RFC 4122 version 4 UUIDs using secure randomness. Generate batches up to 500, copy one row or the entire list.

Unix Timestamp Converter

Live conversion in your browser: numeric timestamps use digit length (≤10 whole digits → seconds, otherwise milliseconds); date strings use Date.parse. Copy UTC, local, ISO, seconds, or milliseconds.

CURL to Fetch Converter

Paste curl, fetch, or axios snippets and convert instantly. Auto-detects input format, preserves auth headers and bodies, and outputs copy-ready code.

Cron Expression Generator

Build cron expressions visually—pick presets like every 5 minutes or weekly Monday, fine-tune each field, copy the expression, and preview the next five run times in local or UTC.