DevKit: JSON, JWT & Dev Tools

DevKit puts 30 developer utilities in your pocket — and every one runs entirely on your device.

Stop juggling browser tabs. Stop pasting production tokens into random websites. Format JSON, decode a JWT, test a regex, or convert a timestamp on a train, on a plane, or inside a locked-down corporate network.

YOUR WORK STAYS ON YOUR DEVICE

> Every tool runs locally. The JSON you paste, the token you decode, the certificate you inspect — none of it is uploaded to a server, and none of it is visible to us.

> All 30 tools work with no internet connection.

> No account, no sign-up, no email required.

FORMATTERS

> JSON Formatter: Beautify or minify JSON with error highlighting and tree view

> HTML Formatter: Beautify, minify, and preview HTML with live rendering

> CSS Formatter: Format and validate CSS with syntax highlighting

> JS Formatter: Format and minify JavaScript

> XML Formatter: Format and validate XML documents

> SQL Formatter: Format and validate SQL queries

PARSERS & DEBUGGERS

> JWT Debugger: Decode tokens, inspect headers and payloads, verify signatures

> Cron Parser: Parse cron expressions with next run calculations

> Certificate Decoder: Decode X.509 certificates

ENCODERS & DECODERS

> Base64: Encode and decode Base64 strings

> URL Encoder: Encode, decode, and parse URLs

> HTML Encoder: Handle HTML entities

> Hash Generator: Generate MD5, SHA-1, SHA-256, SHA-512 hashes

> Backslash Escape: Escape and unescape special characters

CONVERTERS

> Timestamp: Convert Unix epoch timestamps to readable dates

> Case Converter: Transform between camelCase, snake_case, UPPER CASE, and more

> Color Converter: Convert between HEX, RGB, HSL with live preview

> YAML to JSON: Convert between YAML and JSON with tree view

> Number Base: Convert between Binary, Octal, Decimal, Hexadecimal

> Hex to Text: Convert between hex and ASCII

> CSV to JSON: Convert between CSV and JSON

GENERATORS

> UUID/ULID Generator: Create UUIDs and ULIDs instantly

> QR Code: Generate customizable QR codes and export as images

> Lorem Ipsum: Generate placeholder text

> Random String: Generate secure passwords and API keys

TEXT & COMPARISON

> Diff Checker: Compare text with highlighted differences

> RegEx Tester: Test regex with live match highlighting

> Markdown Previewer: Preview Markdown with GitHub Flavored support

> Line Sort: Sort and deduplicate lines

> String Inspector: Analyze string statistics

BUILT FOR MOBILE

> Smart History: Auto-saves recent work, stored only on your device

> Instant Paste: Smart clipboard detection

> Quick Actions: One-tap copy, clear, share

> Native Performance: Blazing fast, no loading screens

> Light & Dark Modes: Beautiful design for any environment

WHO IT'S FOR

> Software engineers debugging away from a desk

> Site reliability engineers checking cron schedules and certificates during an incident

> Backend developers inspecting tokens and payloads

> Engineering managers reviewing a diff or a config between meetings

> Anyone who needs dev tools without a network

PRICING

Pro: $9.99/month or $39.99/year (save 67%)

3-day free trial. Cancel anytime.

WHY DEVKIT

> Works with no connection

> Your work never leaves the device

> Fast, native performance

> Regular updates with new tools

> No ads, ever

> Built by a developer, for developers

Download DevKit and take your tools anywhere.

Terms of Use: Apple's Standard EULA (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)