UD5 Toolkit
JSON to PlantUML Diagram – Online Visualize Data Structure
Paste a JSON object and generate PlantUML code for a class or object diagram. Preview rendered image.
Tag: JSON Formatter & Validator - Format JSON
33+ toolsJSON Duplicate Key Checker – Online Find Repeated Keys
Paste JSON and instantly see if any object has duplicate keys. Quick syntax spotter.
JSON Query Playground - Online jq‑style Filtering
Paste a JSON array and filter/transform it using a simple path expression. Extract nested values without code. Local.
URL Query String to JSON – Online Parse & Format
Paste a full URL or query string and instantly get a pretty JSON object. Parse arrays and nested keys.
JSON Deep Diff Checker - Online Compare & Highlight Changes
Compare two JSON objects and see added, removed, or changed keys. Visual tree view with color highlighting. Handles nested structures. Local processing.
INI to JSON Converter - Online Parse Configuration Files
Paste INI content and convert it to a structured JSON object. Handles sections and comments. Client‑side only.
Local JSON Data Explorer - Online Browser Storage Viewer
View, edit, and manage JSON objects saved in your browser's localStorage. Delete, export, or import keys. No setup.
JSON to Form URL Encoded Converter - Online POST Body Builder
Convert a JSON object into application/x‑www‑form‑urlencoded format. Essential for testing legacy APIs. Pure browser.
i18n JSON to CSV Converter - Online Flatten Translation Files
Convert nested JSON translation files into a flat CSV table for translators. Also reverse back. Local only.
JavaScript Object Diff Viewer - Online Compare Data
Paste two JSON objects and see a highlighted diff showing what was added, removed, or changed. For API testing.
FormData to JSON Converter - Online Debug Multipart
Fill in a form and see the FormData object as JSON. Perfect for debugging multipart form submissions. Client-side.
JSON to INI Converter - Online Config File Translator
Convert a flat JSON object into an INI file format with sections and keys. Useful for legacy configs. Local only.
JSON to Excel (.xlsx) Converter - Online Spreadsheet Creator
Paste a JSON array of objects and download a properly formatted .xlsx Excel file. No server; uses SheetJS in the browser.
JSON to Properties File Converter - Online Java Config
Convert a flat JSON object into a Java .properties file format. Handle nested values by dot notation. Local only.
ICS to JSON Converter - Online Calendar Data Export
Parse an iCalendar file and output the events as a clean JSON array. For developers integrating calendar data. Client‑side only.
JSON to Form Data Converter - Online Encode for POST
Convert a JSON object into a url‑encoded form data string or FormData entries. Useful for testing APIs. Local.
XML to JSON Converter - Online Parse XML to Object
Parse XML strings into compact JSON representation. Handles attributes and text nodes intelligently. Quick and private, ideal for API response translation.
JSON to .env Converter - Online Environment File Generator
Transform a flat JSON object into a dotenv file format instantly. Use it to keep your local configuration in sync. All processing is private and client‑side.
JSON to Code Snippets - Online Generate Model Classes
Paste JSON and generate typed model classes in TypeScript, Python dataclass, or Go struct. Speeds up API dev.
JSON to SQL INSERT/UPDATE Converter - Online
Parse a JSON array and generate SQL INSERT or UPDATE statements. Perfect for data migration. Client‑side only.
TOML to JSON Converter - Online Config File Translator
Parse TOML configuration files and convert them into JSON. Validate TOML syntax with highlighted errors. No server round-trips, fully browser-based.
CLI Table Generator - Online JSON to Console Log Style
Paste a JSON array and view it as a formatted console.table() style output. Copy for terminal apps. Local.
JSON to JSON Schema Generator - Online Infer Structure
Paste a sample JSON object and generate a basic JSON Schema describing its types and required fields. Local inference.
Lottie Animation Previewer - Online JSON Player
Paste Lottie JSON code or upload a .json file and see the animation play. Control speed and loop. Perfect for developers.
JSON to Go Struct / TypeScript / JSON Schema - Online
Paste a JSON object and quickly generate typed structs for Go, TypeScript interfaces, or a JSON Schema. Perfect for API integration.
JSON to TypeScript Interface - Online Type Gen
Paste a JSON object and instantly get a TypeScript interface definition. Handles nested objects and arrays. Local only.
Text to Character Array - Online For Programmers
Split a text into an array of individual characters, ready to paste into code. Options for quotes and newlines.
JSON Diff Compare - Online Highlight Differences
Paste two JSON objects and find the structural differences with side‑by‑side highlighted output. Indispensable for API debugging.
Random JSON Generator - Online Create Sample API Responses
Generate random JSON data with customizable fields (users, products, orders). Useful for frontend mocking. All local.
JSON List to CSV - Online Flat Array Converter
Convert a JSON array of strings or numbers into a single‑column CSV. Quick data dump. Local.
JSON to XML Converter - Online Data Interchange Tool
Seamlessly convert JSON objects into valid XML documents. Control root element naming and attribute formatting. Entirely local, keeping your data safe.
JSON to Graph Visualization - Online Tree Diagram
Paste a JSON object and see a dynamic, draggable tree graph representation. Excellent for debugging nested data.
JSON Formatter & Validator - Online JSON Beautifier
Online JSON formatting and validation tool, supporting JSON minify/beautify, syntax highlighting, and error locating. Data processed locally in browser for security.