Developer Pocket

29 offline developer tools

Free · Designed for iPad. Not verified for macOS.

JSON, YAML, CSV, JWT, JWK, diffs, patches, JSONPath, codegen for 7 languages, schema validation, and more — 29 developer tools, fully offline. Developer Pocket is a fast, native toolbox for the utilities you reach for every day — completely free, no ads, no account, no internet connection required. TOOLS INCLUDED • JSON Formatter — pretty-print, minify, and validate with precise error locations • JSON Diff — compare two JSON documents and see what changed • JSON Merge — deep-merge two documents (RFC 7386) • JSON Patch — apply RFC 6902 add/remove/replace/move/copy/test operations • JSONPath Tester — query JSON with $.user.roles[0]-style paths • JSON Schema Validator — validate an instance against a JSON Schema • JSON Repair — fix trailing commas, single quotes, unquoted keys, and more • JSON Flatten/Unflatten — dot-notation flatten and reverse • JSON Lines — convert between a JSON array and JSON Lines • JSON Escape/Unescape — escape text for embedding, or unescape it back • YAML Converter — JSON ↔ YAML • CSV Converter — JSON ↔ CSV • JSON to TypeScript — infer TypeScript interfaces from a JSON sample • JSON to Swift — infer Codable structs from a JSON sample • JSON to Go — infer Go structs with JSON tags • JSON to Python — infer Pydantic models • JSON to Kotlin — infer kotlinx.serialization data classes • JSON to SQL — infer a CREATE TABLE and INSERT statements • JSON to Markdown — render as a Markdown table • JWT Decoder — inspect header, claims, and expiry at a glance • JWK Viewer — inspect a JSON Web Key or key set • Base64 Encoder/Decoder — text and URL-safe variants • URL Encoder/Decoder — component or full-URL modes, with query parameter breakdown • UUID Generator — bulk generate v4 UUIDs, upper/lowercase, with or without hyphens • Unix Timestamp Converter — live clock plus both-direction conversion with timezone support • Hash Generator — MD5, SHA-1, SHA-256, and SHA-512 digests • Regex Tester — live match highlighting and capture groups • Color Converter — HEX, RGB, and HSL, both directions • QR Code Generator & Scanner — create codes or scan them with your camera PRIVATE BY DESIGN Every tool runs entirely on your device. Nothing you type, paste, or scan is ever sent anywhere — Developer Pocket doesn't have a server to send it to. FREE, NO CATCH All twenty-nine tools, unlocked, forever. No subscription, no paywall, no ads. Built natively for iOS with a modern, glass-inspired interface.

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

The developer, Valliappan Thenappan, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    Valliappan Thenappan
    Size
    2.5 MB
    Category
    Developer Tools
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • iPad
      Requires iPadOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Valliappan Thenappan
  • Developer Website
  • Privacy Policy

    • More by Valliappan Thenappan

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