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JSON Viewer

Parse and visualize JSON data in a tree structure.

Input
Ln:1 Col:1
Output
Enter JSON in the input panel.

About JSON Viewer

JSON (JavaScript Object Notation) is the universal data exchange format used by virtually every REST API, database, and modern web application. Whether you're debugging API responses, inspecting NoSQL database documents, reviewing AWS/GCP configuration files, or analyzing application state, a JSON viewer helps you instantly understand complex nested data structures.

JSON Structure Quick Reference

JSON supports six data types: objects (key-value pairs wrapped in {}), arrays (ordered lists wrapped in []), strings (always double-quoted), numbers, booleans (true/false), and null. Keys must always be double-quoted strings. Values can be any JSON type, enabling unlimited nesting depth. Valid JSON requires no trailing commas and no comments.

Common validation errors include: trailing commas after the last item in an object or array, single-quoted strings instead of double-quoted, undefined or NaN values (which are JavaScript-specific and not valid JSON), and unescaped control characters in strings. If you need comments or trailing commas in your config files, consider JSON5 or JSONC (JSON with Comments) formats instead.

FAQ

What is the difference between a JSON Viewer and JSON Formatter?
A viewer visualizes data in a tree or collapsible structure, while a formatter applies indentation and line breaks for readability. This tool provides both.
Can large JSON files be processed?
It depends on browser memory, so files over several tens of MB may slow down. For large files, use jq (CLI) or streaming parsers for efficiency.
Can I add comments in JSON?
Standard JSON (RFC 8259) does not support comments. Use JSON5, JSONC, or YAML if you need comments. VS Code settings files use JSONC format.

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