# Dev Tool box - Developer Tools

> JSON formatter, URL encoder, Base64, JWT decoder, hash generator, and more.

Canonical page: [https://chrome-stats.com/d/com.gonigon.devtoolbox](https://chrome-stats.com/d/com.gonigon.devtoolbox)

## Overview

- **ID:** `com.gonigon.devtoolbox`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Gonigon
- **Category:** TOOLS
- **Downloads:** 109
- **Version:** 1.0.1
- **Last updated:** 2026-08-24
- **First published:** 2026-03-23
- **Publisher country:** KR
- **Size:** 52 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.gonigon.devtoolbox)
- **Website:** [https://tjdrhs90.github.io](https://tjdrhs90.github.io/)
- **Privacy policy:** [https://tjdrhs90.github.io/privacy/](https://tjdrhs90.github.io/privacy/)

## Description

Dev Toolbox is a fast, lightweight developer utility app for your mobile device 🛠️<br><br>Format JSON, encode URLs, decode Base64, inspect JWT tokens, and more -- all without opening your laptop ⚡<br><br>📋 Features<br><br>🔸 JSON Formatter — Pretty-print and validate JSON strings instantly.<br>🔸 URL Encode/Decode — Encode and decode URLs with RFC 3986 compliance.<br>🔸 Base64 Encode/Decode — Convert text to and from Base64. Supports URL-safe format.<br>🔸 JWT Decoder — Decode JWT tokens into Header, Payload, and Signature.<br>🔸 Text Case Converter — Convert between 9 text cases including camelCase, snake_case, kebab-case, PascalCase, and more.<br>🔸 Hash Generator — Generate MD5, SHA-1, SHA-256, and SHA-512 hashes at once.<br>🔸 Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates.<br>🔸 Number Base Converter — Auto-detect and convert between decimal, binary, octal, and hexadecimal.<br>🔸 String Escape/Unescape — Handle escape sequences in strings.<br>🔸 Color Converter — Convert between HEX, RGB, and HSL with a live color preview.<br><br>✨ Highlights<br>💾 Auto-save — Your input is saved and restored automatically.<br>🌙 Dark mode support<br>📋 One-tap copy to clipboard<br>📱 On-device — every conversion runs locally and your input is never uploaded.

## Rankings

- #1,946,422 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.SYSTEM_ALERT_WINDOW`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.android.vending.CHECK_LICENSE`
- `com.gonigon.devtoolbox.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.gms.permission.AD_ID`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.gonigon.devtoolbox)