Trusted by 1M+ Developers

Free JSON Viewer & Formatter Online Beautify JSON Instantly

The most powerful free JSON toolkit: format, validate, compare, edit, minify, and convert JSON to CSV, XML, YAML, and more. No sign-up needed. Works 100% in your browser—your data stays private.

JSON Editor - Edit & Validate in Real-Time

Paste your JSON below and format it instantly

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Compare JSON Files & Generate Test Data

Essential tools for JSON manipulation and testing

JSON Compare & Diff Online

Compare two JSON files side-by-side, find differences instantly, and merge changes with our free online diff tool.

JSON Viewer & Tree Explorer

View, explore, and navigate complex JSON data with syntax highlighting, collapsible tree view, and search functionality.

JSON Test Data Generator

Generate realistic fake JSON data for testing APIs, databases, and applications. Customizable schemas supported.

Run Code Online: C, JavaScript & Python Compilers

Write and execute code directly in your browser

Online C Compiler & IDE

Write, compile, and run C code online for free. Fast execution with real-time error detection and output.

Online Python Compiler & IDE

Run Python 3 code instantly in your browser. Perfect for learning, testing snippets, and quick prototyping.

Online JavaScript Compiler & Console

Execute JavaScript code online with console output. Test ES6+ features, debug scripts, and share code snippets.

JSON Converters & Data Transformation Tools

Convert between JSON and other data formats with ease

JSON Editor with Validation

Edit JSON with real-time syntax validation, auto-formatting, error highlighting, and keyboard shortcuts.

JSON Minifier & Compressor

Minify JSON to reduce file size by up to 60%. Remove whitespace and comments for production-ready output.

JSON to Table Converter

Visualize JSON arrays as interactive, sortable tables. Perfect for exploring API responses and data analysis.

Markdown Editor & Previewer

Write and preview Markdown in real-time. Export to HTML, supports GitHub Flavored Markdown and syntax highlighting.

Python Dict to JSON Converter

Convert Python dictionaries to valid JSON instantly. Handles nested objects, lists, and special characters.

Text Compare & Diff Checker

Compare two text files or code blocks to find differences. Line-by-line diff with highlighting.

JSON to YAML Converter Online

Convert JSON to YAML format for Kubernetes, Docker Compose, and configuration files. Preserves structure perfectly.

YAML to JSON Converter Online

Transform YAML configuration files to JSON format. Validates YAML syntax and handles multi-document YAML.

XML to JSON Converter Online

Convert XML to JSON with proper attribute handling. Supports nested elements and preserves data types.

JSON to XML Converter Online

Transform JSON data to well-formed XML. Customizable root element and attribute mapping options.

JSON to Base64 Encoder

Encode JSON data as Base64 for API payloads, JWT tokens, and data embedding. UTF-8 safe encoding.

Text to Base64 Encoder Online

Convert plain text to Base64 encoding securely. Perfect for basic authentication headers and data URIs.

Base64 to Text Decoder Online

Decode Base64 strings back to plain text. Handles UTF-8, ASCII, and binary data safely.

JSON to CSV Converter Online

Convert JSON arrays to CSV/Excel format. Flatten nested objects and export for spreadsheet applications.

CSV to JSON Converter Online

Transform CSV data to JSON arrays or objects. Auto-detect delimiters and handle quoted values.

Word & Character Counter Tool

Count words, characters, sentences, paragraphs, and reading time. Convert text case and remove extra spaces.

Hash Generator - MD5, SHA-256 Online

Generate secure hash values: MD5, SHA-1, SHA-256, SHA-384, SHA-512. Perfect for checksums and verification.

UUID Generator - v1, v4, v5 Online

Generate UUIDs online: version 1 (timestamp), version 4 (random), and version 5 (namespace). Bulk generation supported.

YAML Validator & Linter Online

Validate YAML syntax instantly. Catch indentation errors, formatting issues, and structural problems with detailed error messages.

Why 1M+ Developers Choose JSON Reader?

JSON Reader is the ultimate free JSON toolkit trusted by developers worldwide. With one-click formatting, syntax validation, and error detection, you'll never struggle with messy JSON again. Our powerful features include: side-by-side JSON comparison, format conversion to CSV, XML, YAML, and Base64, plus a JSON generator for creating test data. Unlike other tools, everything runs locally in your browser—your sensitive data never leaves your device. We also offer UUID generators, hash generators (MD5, SHA-256), word counters, text diff checkers, and online compilers for C, JavaScript, and Python. Whether you're debugging an API response, validating configuration files, or converting data formats, JSON Reader has you covered. Fast, free, and no registration required.

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Frequently Asked Questions

Everything you need to know about JSON Reader

What is JSON Reader and how does it help developers?

JSON Reader is a comprehensive, free online JSON toolkit designed for developers, data analysts, and IT professionals. It provides instant JSON formatting with syntax highlighting, real-time validation that catches errors as you type, and powerful transformation tools. Whether you're debugging API responses, validating configuration files, or converting between data formats (JSON to CSV, XML, YAML), JSON Reader makes your workflow faster and error-free. All processing happens locally in your browser, ensuring your sensitive data never leaves your device.

Why should I format JSON online?

Formatting JSON makes complex nested data structures readable and easier to debug. Raw JSON often appears as a single line of text, making it nearly impossible to understand. JSON Reader's formatter adds proper indentation, syntax highlighting, and collapsible sections so you can quickly navigate large JSON files. This is essential when working with API responses, configuration files, package.json, database exports, or any JSON data. Plus, our online tool requires no installation, works on any device, and keeps your data private.

How do I format JSON using JSON Reader?

Formatting JSON with JSON Reader is simple: 1) Paste your JSON data into the editor or click the upload button to load a file, 2) Click the 'Format' button or press Ctrl+Shift+F, 3) Your JSON is instantly beautified with proper indentation and syntax highlighting. You can also customize the indentation (2 or 4 spaces, tabs), switch between light and dark themes, and download the formatted output. The tool automatically detects and highlights syntax errors, making it easy to fix invalid JSON.

Is JSON Reader safe and secure? Is my data private?

Yes, JSON Reader prioritizes your security and privacy. All JSON processing happens 100% locally in your web browser using JavaScript. Your data is NEVER uploaded to our servers, stored in databases, or transmitted over the internet. This means you can safely use JSON Reader with sensitive data, API keys, configuration files, or any confidential information. There's no data collection, no tracking of your JSON content, and no login required. Your browser does all the work.

Is JSON Reader free? Do I need to register or login?

JSON Reader is completely free to use with no limitations. All tools—including the JSON formatter, validator, editor, diff checker, and all converters—are available without any registration, login, or payment required. There are no premium tiers, no usage limits, and no feature restrictions. We believe developer tools should be accessible to everyone. Bookmark the page and use it whenever you need it, forever free.