JSON Viewer - Format, Validate & Explore JSON Online

Free Online JSON Viewer

The Tooloogle JSON Viewer turns raw JSON — whether copied from an API response, a config file, or a database export — into a structured, navigable tree. Validate syntax, expand and collapse nested objects, search for keys, and copy individual values with one click.

Features

• Pretty print — format compact JSON with configurable indentation (2, 4 spaces, or tabs).

• Tree view — collapsible nodes for objects and arrays make deep structures easy to explore.

• Syntax highlighting — colour-coded keys, strings, numbers, booleans, and nulls.

• Validation — instant error reporting with line numbers when JSON is malformed.

• Search — find keys or values across the entire document.

• Copy path — right-click any node to copy its dot-notation path (e.g. data.users[0].email).

• Minify — one-click convert back to compact JSON for production payloads.

How to Use

1. Paste JSON (or drop a .json file) into the input.

2. The tree view renders instantly. Errors are highlighted with a clear message and line number.

3. Expand or collapse branches, search for keys, copy values or paths.

4. Use Format or Minify buttons to switch between pretty and compact representations.

Common Use Cases

Debugging API responses. Inspecting webhook payloads. Reviewing config files (package.json, tsconfig.json). Reading log entries. Comparing two payloads side-by-side. Teaching JSON structure to beginners.

Privacy

All parsing happens in your browser. Your JSON — which often contains user data, API tokens, or business logic — never leaves your machine. No upload, no logging, no analytics on document content.