DevScratchpad

JSON Formatter & Validator

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100% Offline, Private Developer Tools

DevScratchpad is a suite of 19+ privacy-first developer utilities. Every tool runs entirely within your browser using client-side processing. Zero server transmission. Once loaded, it works entirely offline. Your data, payloads, and tokens never leave your machine.

Code Formatting

JSON Formatter, Minifier & Validator

Format, validate, and minify JSON data

XML Formatter & Minifier

Format, beautify, and minify XML data

SQL Formatter

Format and beautify SQL queries

GraphQL Formatter

Format and beautify GraphQL queries

Security & Crypto

JWT Decoder

Decode JSON Web Tokens instantly and securely

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes

HMAC Webhook Generator

Compute HMAC signatures for webhook testing

Base64 Encoder & Decoder

Encode and decode Base64 strings securely

Networking & Unix

Unix Timestamp Converter

Convert Epoch to human-readable dates and vice versa

Cron Expression Visualizer

Convert cron expressions into human-readable English descriptions

IP / CIDR Calculator

Calculate network address, broadcast, and host range

Code Converters

cURL Command Converter

Transform cURL commands into executable code

JSON to TypeScript Converter

Generate TypeScript interfaces and types from JSON data

YAML / JSON Converter

Convert between YAML and JSON formats bidirectionally

URL Encoder & Decoder

Safely encode and decode URL components

Diff & Optimization

Diff Checker

Compare text and code side-by-side

CSS & SVG Minifier

Minify and compress CSS stylesheets and SVG vector graphics

Markdown Previewer

Live preview Markdown with sanitized HTML

Regex Tester

Test and debug regular expressions in real-time

Why DevScratchpad?

  • Zero Server Transmission: Everything happens in your browser. We don't even have a backend database to store your data.
  • Lightning Fast: No API latency. Processing happens instantly on your device.
  • Offline Capable: Works without an internet connection once loaded.
  • Free & Open: Accessible to all developers without sign-ups or limits.

Frequently Asked Questions

What tools does DevScratchpad offer?

DevScratchpad provides over 19 developer tools including JSON/XML/SQL formatters, JWT decoders, Hash/HMAC generators, Base64/URL encoders, timestamp converters, CIDR calculators, diff checkers, and more.

Is DevScratchpad really free?

Yes, DevScratchpad is 100% free to use with no hidden fees, premium tiers, or account registration required.

Does DevScratchpad work offline?

Yes! Once the website loads in your browser, all tools execute strictly using client-side JavaScript, meaning they work fully offline without any network dependency.

Is my data safe with DevScratchpad?

Absolutely. Your data never leaves your device. All inputs, text, tokens, and payloads are processed locally in your browser's memory and are never transmitted to any remote servers or databases.

100% Client-Side Privacy Guarantee

All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.