JSON Viewer & Editor - JSONLab

JSON Viewer & Editor is a fast and powerful JSON editor for developers, analysts, testers, and power users who work with JSON files every day.

Open, read, edit, format, validate, and export JSON files with a clean offline experience built for speed and reliability. Whether you need a JSON viewer for API responses, a JSON formatter for messy data, or a JSON editor for large files, this app helps you work faster and with more confidence.

View and edit JSON easily

Use a powerful code view with syntax highlighting, line numbers, and code folding for smooth editing. Switch to tree view to explore nested JSON objects and arrays in a more visual and structured way. Edit keys and values instantly, including strings, numbers, booleans, and null.

JSON tree view for complex files

Navigate large and deeply nested JSON with an intuitive tree viewer designed for clarity. Expand or collapse nodes, follow breadcrumb navigation, and focus on specific branches without losing context. This makes the app ideal for inspecting config files, API responses, logs, and structured datasets.

Fast JSON viewer for large files

Open large JSON files without freezing or lag. The app is optimized for performance, with smart virtualization and background processing that keep the interface responsive even when working with massive or minified JSON content. Built for real-world files, not just small examples.

JSON formatter, beautifier, and minifier

Format JSON instantly with one tap using prettify and minify tools. Clean up unreadable JSON, convert minified data into readable structure, and make debugging easier. Use it as a JSON beautifier, JSON formatter, and JSON minifier in one app.

JSON validator with clear errors

Validate JSON in real time while editing. Spot syntax issues quickly with clear error messages and fix problems before exporting or sharing. Perfect for debugging broken JSON and verifying file structure before use.

Search and replace

Find text quickly across code view and tree view. Use Find and Replace to update repeated keys or values faster, and jump to specific lines when working inside long JSON documents. This saves time when editing large or complex files.

Export JSON in multiple formats

Export JSON to Excel (.xlsx), CSV, PDF, or plain text for reporting, analysis, and sharing. Smart flattening helps convert structured JSON data into tabular formats that are easier to view outside the app. Share exported files instantly with system share options.

Built for everyday JSON work

JSON viewer for opening and reading JSON files

JSON editor for modifying keys and values

JSON tree view for nested objects and arrays

JSON formatter and JSON beautifier for readable output

JSON validator for error checking

JSON minifier for compact output

Large JSON file support

Offline JSON tool with no login required

Light mode and dark mode support

Clean and distraction-free interface

If you need a fast JSON viewer, reliable JSON editor, powerful JSON formatter, smart JSON validator, and smooth JSON tree viewer in one app, JSON Viewer & Editor is built for you.