Professional JSON Viewer & Formatter | Analyze, Minify & Beautify JSON

JSON Viewer Pro

The ultimate offline tool to Parse, Validate, Format, and Explore JSON.

Input (Raw JSON) 0 KB

Interactive Tree

{}

Waiting for valid JSON input...

How to Use JSON Viewer Pro

Welcome to JSON Viewer Pro, a sophisticated, client-side utility engineered for developers, data scientists, and QA engineers who require precision and speed. Unlike many web tools that send your data to a remote server for processing, JSON Viewer Pro operates entirely within your browser's memory. This guarantees 100% data privacy—your sensitive configurations, user data, or API responses never leave your device.

1. Inputting Your Data

The tool provides three flexible methods to get your data into the workbench:

Direct Paste: Copy JSON text from your IDE, API response, or log file and paste it directly into the left "Input" panel. The tool handles large text blocks efficiently.
File Upload: For larger datasets, click the "Upload File" button. This supports .json and .txt files. The content is read instantly using the HTML5 FileReader API without network latency.
Manual Typing: You can use the input area as a scratchpad to type and structure new JSON objects from scratch.

2. Validation & Formatting

Upon pasting or uploading, click the "Format / Beautify" button. The engine immediately parses the string. If the syntax is valid, it reformats the code with standard 4-space indentation, making it human-readable. If the JSON is invalid (e.g., missing quotes, trailing commas), a detailed error message appears at the top, helping you pinpoint exactly where the syntax broke.

3. Exploring with the Tree View

The right-hand panel converts your static text into a dynamic, interactive tree.

Navigation: Use the triangle icons (▶) or click the bracket placeholders {...} to expand or collapse sections. This allows you to drill down into deeply nested objects without losing context.
Type Recognition: The tool automatically syntax-highlights data types for rapid visual scanning. Strings appear in orange, numbers in green, booleans in blue, and nulls in italics.
Deep Path Analysis: Hover your mouse over any key or value in the tree. A floating tooltip will appear at the bottom of the screen displaying the exact JSON Path (e.g., response.data.users[0].id). This is invaluable for copying paths into your code or database queries.

4. Search & Minification

Smart Search: The search bar isn't just a text filter. When you type a query, the tool traverses the object tree, highlights matching keys or values in gold, and—crucially—automatically expands the parent nodes so you can see the match in its hierarchy immediately.
Minification: Need to compress data for an API payload? Click "Minify" to strip all whitespace and newlines, reducing the payload size to its absolute minimum while keeping the tree view readable for verification.