# DevKit: JSON, JWT & Dev Tools — Offline Formatter & Debugger

> Offline developer toolkit with 30+ utilities for formatting, debugging, and conversion. (iPhone/iPad app by Alexander Herdt.)

- Source: https://appshunter.io/ios/app/devkit-json-jwt-and-dev-tools/id6754946567 (this page in markdown: same URL + `.md`)
- Developer: [Alexander Herdt](https://appshunter.io/developer/1851072441)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 52 MB
- Languages: American English
- Released: 2025-11-28
- Data updated: 2026-08-28
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/devkit-json-jwt-and-dev-tools/id6754946567/reviews.md

## What is DevKit?

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/)

## Key features

- 30+ offline developer utilities
- JSON, HTML, CSS, JS, XML, SQL formatting
- JWT decoding and certificate inspection
- Base64, URL, and HTML encoding/decoding
- Hash generation (MD5, SHA-256)
- Timestamp and number base conversion
- QR code generation

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Yearly | $39.99 | per year |
| Pro Monthly | $9.99 | per month |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/devkit-json-jwt-and-dev-tools/id6754946567/reviews.md

### 5/5 — DevKit

*2026-07-17*

Amazing app for devs that are always on call, thank you

## Frequently asked questions about DevKit

### Does DevKit have ads?

No, DevKit is ad-free. The application does not contain advertisements, allowing for an uninterrupted user experience.

### What are the subscription options for DevKit?

DevKit offers 'Pro Monthly' for $9.99/month with a 3-day free trial, and 'Pro Yearly' for $39.99/year with a 3-day free trial.

### How often is DevKit updated?

The latest version of DevKit is 1.0.7, and it was last updated on July 23, 2026. Updates typically include new features and performance improvements.

### What devices does DevKit support?

DevKit is available for iPhone, iPad, and iPod. It is designed to run natively on iOS devices.

### Is DevKit suitable for younger users?

DevKit has an age rating of 4+, making it accessible for a wide range of users. Its tools are primarily for technical purposes.

### Does DevKit require an internet connection?

No, all 30 tools within DevKit run entirely on your device and work without an internet connection. This ensures privacy and offline usability.

### What kind of data formatting does DevKit offer?

DevKit offers extensive formatting capabilities, including beautifying or minifying JSON with error highlighting and tree view, formatting HTML with live rendering, and validating CSS and SQL.

### Can DevKit help with security-related tasks?

Yes, DevKit can assist with security by decoding JWT tokens, inspecting X.509 certificates, and generating secure random strings for passwords or API keys.

## Version history (last 5 releases)

### 1.0.7 — 2026-07-23

UI/UX improvements, bug fixes

### 1.0.6 — 2026-06-04

UI/UX, performance improvements. Bug fixes

### 1.0.5 — 2026-01-07

v1.0.5

> Bug fixes, UI improvements

### 1.0.4 — 2025-12-28

What's New in v1.0.4

> UI/UX Enhancements: We've streamlined more tools to make your experience smoother and more productive.
> Bug Fixes: Eliminated some bugs for certain tools and features.

### 1.0.3 — 2025-12-23

What's New in Version 1.0.3

> 11 NEW TOOLS ADDED
We've added Certificate Decoder, CSV to JSON Converter, CSS Formatter, JS Formatter, XML Formatter, SQL Formatter, and more! DevKit now includes 30 essential tools.

> UI/UX ENHANCEMENTS
Enhanced visuals, improved navigation, and better overall user experience across the app. Enjoy a more polished and intuitive interface.

> PERFORMANCE & BUG FIXES
Various performance improvements and bug fixes for a smoother, faster experience.
Thanks for using DevKit! If you enjoy the app, please leave us a review. Have feedback? Contact us through the app's profile page.

## More apps by Alexander Herdt

- [Zuluu: Daily Affirmations](https://appshunter.io/ios/app/zuluu-daily-affirmations/id6757251283)

All apps by Alexander Herdt: https://appshunter.io/developer/1851072441

## Related topics

[dev tools kit](https://appshunter.io/ios/topics/dev-tools-kit) · [devbuddy dev tools](https://appshunter.io/ios/topics/devbuddy-dev-tools)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*