JSON Viewer

A JSON viewer is an online tool that displays JSON (JavaScript Object Notation) data in a readable, interactive format with syntax highlighting and collapsible tree structures. Whether you're a developer debugging API responses, a data analyst inspecting JSON files, or a tester validating data structures, our JSON viewer makes complex nested data easy to understand.

This tool supports syntax highlighting, collapsible/expandable tree views, line numbers, and search functionality. Simply paste your JSON data, and instantly visualize its structure with color-coded values, types, and hierarchy. All viewing is performed client-side, ensuring your sensitive data remains private and secure.

JSON is the standard format for API responses and data interchange in web development, but raw JSON can be difficult to read, especially when minified or deeply nested. Developers need to quickly understand data structures when debugging API integrations, analyzing server responses, or exploring third-party data sources. A JSON viewer transforms cryptic text into an organized, navigable structure.

API developers use JSON viewers to inspect response payloads, verify data types, and navigate nested objects and arrays efficiently. Frontend engineers benefit from visualizing API data before integrating it into applications, while QA testers use viewers to validate response structures and catch data inconsistencies.

The tool saves time by eliminating the need to manually parse JSON structure, provides instant visual feedback on data hierarchy, and makes it easy to locate specific values within large JSON documents. It's particularly valuable when working with deeply nested objects, large arrays, or minified JSON that lacks formatting.

API Development: Inspect REST API responses to verify data structure, types, and nested relationships.

Debugging: Visualize JSON configuration files and application state to identify data issues quickly.

Data Analysis: Explore complex JSON datasets with multiple levels of nesting for research and reporting.

Integration Testing: Validate third-party API responses match expected schemas and data formats.

Learning & Documentation: Understand JSON structure by visualizing examples from documentation and tutorials.

Using our JSON viewer is simple: paste your JSON data into the input area, and it's instantly displayed as an interactive tree view with syntax highlighting. Click on any node to expand or collapse nested structures, making it easy to focus on specific sections. Use the search function to quickly locate keys or values within large documents.

The viewer automatically validates your JSON and highlights any syntax errors with helpful error messages. Line numbers help you locate issues in your original source. All viewing is performed locally in your browser, ensuring your JSON data remains completely private and never leaves your device.