Developer tools
Paste, format, decode, test, and generate common development values in browser-friendly tools with clear editable work areas.
Tools
Cron, SQL, JSON, regex, JWT, API, UUID, timestamp, database, and CSS utilities.
Generate readable cron expressions for daily, weekly, monthly, weekday, and interval schedules.
Open toolDeveloperFormat SQL into a readable query with clearer clauses, joins, ordering, and indentation.
Open toolDeveloperConvert JSON to YAML or basic YAML back to JSON, with formatting and structure checks.
Open toolDeveloperGenerate browser-side UUIDs for test data, database keys, fixtures, and API examples.
Open toolDeveloperTest a regular expression against sample text and inspect matches, indexes, and match lengths.
Open toolDeveloperDecode a JSON Web Token header and payload without sending it to a server.
Open toolDeveloperPaste PostgreSQL DDL and extract foreign-key relationships into a readable dependency map.
Open toolDeveloperPretty-print JSON API responses and inspect object, array, key, and depth counts.
Open toolDeveloperConvert Unix seconds or milliseconds into UTC, UK local time, ISO strings, and relative age.
Open toolDeveloperGenerate practical CSS snippets for clamp typography, grid layouts, shadows, and buttons.
Open toolOverview
The developer utilities are built for quick everyday checks: formatting SQL, converting JSON and YAML, testing regex, decoding JWT structure, and generating UUIDs or CSS snippets.
Each tool makes the editable source area obvious and keeps the generated output close by for copying or checking.
Good for
FAQs
Each developer utility has an Edit or Paste Here panel on the calculator page. Paste the source text or adjust the settings there, and the result updates beside it.
No. The tools are designed for local browser use, but you should avoid pasting live secrets, production tokens, customer data, or confidential payloads into any online utility.
API response formatting, JSON/YAML conversion, JWT decoding, timestamps, and regex testing often work together when inspecting payloads and integration data.