JSON to CSV Converter & Viewer

Manyu Lab LLC.

Contains adsIn-app purchases

About this app

View, edit, and convert JSON and CSV files on mobile with ease!

JSON CSV Master is a lightweight yet powerful data productivity tool that instantly parses complex JSON and CSV files into clean, readable spreadsheet tables. Seamlessly convert between JSON and CSV with a single tap, flatten nested JSON objects, format minified code, and edit data on the go—built specifically for mobile developers, data analysts, QA engineers, and students.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Key Features
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

📊 1. Instant Tabular Grid Viewer (JSON & CSV)
• Renders JSON arrays and CSV files into clean, structured table rows and columns.
• Smooth horizontal and vertical scrolling allows effortless navigation through large datasets on your smartphone screen.
• Preserves the original JSON key order so your columns appear exactly as structured in the source file.
• For non-tabular or deeply unstructured objects, smoothly switch to the built-in code editor with a single tap.

🔄 2. Seamless Two-Way Conversion (JSON ↔ CSV)
• JSON to CSV: Convert JSON arrays into standardized CSV format in seconds.
• CSV to JSON: Convert comma-separated table rows back into structured JSON data effortlessly.
• Robust handling of commas, quotes, line breaks, and special characters with automated CSV escaping.

⚡ 3. Advanced Nested JSON Handling
Say goodbye to broken tables caused by nested hierarchies. Choose between two powerful parsing methods:
• Flatten with Dots: Transforms nested keys like {"user": {"name": "John"}} into dot-separated headers such as "user.name", neatly mapping all deep data into flat CSV columns.
• Keep Objects as Strings: Preserves nested objects or arrays as raw JSON strings inside individual cells, maintaining original schema integrity.

✏️ 4. Built-in Code Editor & JSON Prettifier
• View and edit both original source data and converted outputs directly within the app.
• Prettify Formatter: Beautify minified, single-line JSON files with clean indentation for effortless inspection.
• Search & Replace: Quickly find keywords with live highlights, jump between occurrences, and replace text in bulk.
• Developer-friendly controls: Line numbers, Jump to Line, Undo/Redo history, and font adjustments.
• Read-Only Lock Mode: Protect critical datasets from accidental touches and unintended edits.

📋 5. Fast Import & Direct Clipboard Paste
• Open Local Files: Easily import .json and .csv files from your device storage via the native Storage Access Framework.
• Paste from Clipboard: Quickly paste API payloads copied from web browsers, curl outputs, or messaging apps to view them in tabular format immediately.
• Built-in Sample Datasets: Explore sample files to quickly test flat tables, non-tabular objects, and nested conversions.

🔒 6. 100% Offline & Private On-Device Processing
• All parsing, conversion, and editing run entirely on your local device.
• No cloud uploads, no external server transfers, and no tracking. Confidential API tokens, test payloads, and proprietary customer data remain strictly private and secure.

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Who Is This App For?
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
• Mobile & Web Developers checking REST/GraphQL API responses on the move.
• Data Analysts & Scientists who need to inspect CSV reports and JSON feeds quickly.
• QA Testers verifying data structures and edge-case payloads without needing a desktop.
• Computer Science Students learning data formats and data preprocessing.

Streamline your mobile data workflow today with JSON to CSV Converter & Viewer!

What’s new

* Large File Streaming: Safely open large JSON, CSV, and text files up to 100MB+ with 90% less memory.
* Direct Editor Routing: Large files (>10MB) open directly in editor mode for fast, smooth loading.
* Refined Editor Layout: Maximized typing area with slimmer line number margins and a gutter divider.
* Reliable Search & Replace: Memory-safe Replace All even on huge documents.
* Stability improvements for JSON formatting and undo memory.