DevKit: JSON, JWT & Dev Tools
DevKit: JSON, JWT & Dev Tools has 3 ratings, averaging 5.0 stars, #825 of 1,721 in Developer Tools.
Description
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/)
Growth change in ratings
| Per | Growth | Growth % | Actual change | Measured over |
|---|---|---|---|---|
| day | Not enough history yet | |||
| week | 0 | — | 0 | 13.5 days |
| month | Not enough history yet | |||
| year | Not enough history yet | |||
How these figures are measured
Change in ratings, scaled to each window from the real gap between crawls. A window needs a full period of history before it reports anything.
Tracking since 09/05/2026. History accumulates as changes are observed — check back soon.
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