DevTools Hub

Free Online Developer Tools

10 essential tools every developer needs — JSON formatter, JWT decoder, regex tester, UUID generator, and more. No sign-up. 100% client-side.

All processing happens in your browser. Your data never leaves your machine.

All Developer Tools

JSON Formatter

Beautify, minify, and validate JSON with syntax highlighting and real-time error detection.

JSON Validator

Validate JSON syntax instantly. Get precise error messages with line numbers for quick debugging.

JWT Decoder

Decode and inspect JWT tokens. View header, payload, claims, and expiration — no server needed.

Regex Tester

Test regular expressions with real-time matching, highlighting, and match group extraction.

UUID Generator

Generate UUIDs in bulk. Supports v1 (timestamp), v4 (random), v6, and v7 formats.

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to text. Supports full UTF-8 character set.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512, RIPEMD-160, and HMAC-SHA256 hashes from any text.

Password Generator

Create cryptographically strong passwords with customizable length, symbols, and character sets.

Cron Expression Parser

Parse and explain cron expressions in plain English. Supports 5, 6, and 7-field formats.

Unix Timestamp Converter

Convert Unix timestamps to human dates and dates to timestamps. Live epoch clock with timezone support.

Why Developers Choose DevTools Hub

Instant Results

Every tool processes your input in real-time with debounced auto-detection. No loading screens, no submit buttons — just paste and go.

100% Private & Secure

All tools run entirely in your browser using client-side JavaScript. Your JSON data, JWT tokens, and passwords are never transmitted to any server.

Free Forever

No sign-up, no account, no subscription, no usage limits. All 10 developer tools are and will remain completely free.

Frequently Asked Questions

Are these developer tools free to use?
Yes, all 10 tools on DevTools Hub are completely free with no sign-up, no account, and no limits. Use them as much as you need.
Is my data safe when using DevTools Hub?
Absolutely. All processing happens directly in your browser using JavaScript. No data is ever sent to a server. Your JSON, JWTs, passwords, and other inputs never leave your machine.
What is the JSON Formatter used for?
The JSON Formatter takes raw, minified, or messy JSON and pretty-prints it with proper indentation. It also validates JSON syntax and can minify formatted JSON for production use.
How does the JWT Decoder work?
The JWT Decoder splits a JSON Web Token into its three parts (header, payload, signature), Base64-decodes the header and payload, and displays them as formatted JSON. It works entirely client-side.
Can I generate UUIDs in bulk?
Yes. The UUID Generator can create up to 100 UUIDs at once in v1, v4, v6, or v7 formats. You can copy all of them to your clipboard with one click.
What hash algorithms are supported?
The Hash Generator supports MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, RIPEMD-160, and HMAC-SHA256. Choose the algorithm from the dropdown and the hash is computed in real-time.
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