Developer Tools

Free tools for developers

Simple, fast, and private. Everything runs in your browser — no data is sent to any server.

JSON Formatter

Format, validate, and minify JSON.

Paste raw or minified JSON to instantly format it with proper indentation. Validates structure and shows clear error messages for invalid input.

Inspect tokens without sending them anywhere.

Decode and inspect the header and payload of any JSON Web Token — entirely in your browser. No data leaves your machine.

Translate cron schedules to plain English.

Enter any standard 5-field cron expression and get a plain-English description plus the next scheduled run times in your local timezone.

Encode or decode Base64 instantly.

Convert plain text or binary data to Base64 and back. Runs entirely in your browser — nothing is transmitted.

Timestamp ↔ human-readable date.

Convert Unix timestamps to readable dates and back. See UTC, local time, ISO 8601, and relative time all at once.

Generate RFC 4122 v4 UUIDs in bulk.

Generate cryptographically random UUIDs using your browser's built-in crypto API. Copy one or grab a batch.

SHA-1, SHA-256, and SHA-512 hashes.

Generate cryptographic hashes from any text using the browser's native WebCrypto API. Nothing leaves your machine.

Test regular expressions with live match highlighting.

Write a regex pattern, paste your test string, and see matches highlighted in real time. Supports flags and shows captured groups.

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