FreeJSONtoCSV

JSON Viewer & Inspector.

Paste or upload JSON files to explore nested structures. Search keys and values, collapse/expand sections, and toggle pretty print views privately.

100% Client-Side Safe
• Your data is processed locally in your browser and never uploaded.

Input JSON

JSON Tree View

Paste or upload JSON to view interactive tree.

Viewer Metrics

Key Count-
Max Depth-
Technical Guide

JSON Viewer Developer Reference.

FreeJSONtoCSV Viewer is an interactive, client-side visualizer built to inspect, search, and navigate complex JavaScript Object Notation (JSON) structures. Operating 100% locally in-memory, the tool lets you expand nested tree nodes and query key/value mappings without exposing proprietary configurations or user data to external servers.

What is a JSON Tree?

A JSON Tree renders raw flat text strings into expandable visual objects and lists. It translates curly braces () and square brackets ([]) into collapsible branches, showing count labels for children.

What is Path Navigation?

Path navigation tracks your active cursor depth. Hovering over a key resolves its dot-notation locator path (e.g. store.orders[2].id), allowing developers to copy paths directly for configuration lookups.

How to View & Query JSON:

  1. Input JSON String: Paste raw JSON text or upload a .json file into the text editor panel.
  2. Interactive Inspection: Click node handles (▶ / ▼) to expand or collapse nesting levels. Use the top toggles to expand all or collapse all instantly.
  3. Filter & Search: Type keywords in the search inputs to filter keys or values. Matching nodes are expanded and highlighted with a yellow background.

Retrieving Dot-Notation paths

When inspecting nested APIs, finding the exact path to a key manually is time-consuming. Our interactive tree listens to hover states and builds the accessor path dynamically. Clicking a node key copies its absolute path (e.g., users[0].address.city) to the clipboard instantly, speeding up coding tasks.

Common Mistakes

  • Trying to parse malformed JSON: The viewer requires a valid syntax structure to render. Run invalid inputs through the JSON Validator to repair missing tokens before viewing.
  • Relying on browser extension conflicts: Unlike extensions that overwrite raw page responses, this tool is an isolated sandbox workspace offering key counting and depth metrics.

Size Limitations

  • Virtual Node Caps: Rendering 100,000+ DOM nodes simultaneously will lag the browser thread. For files over 50MB, the viewer limits initial auto-expansion levels to maintain smooth scrolling and high Interaction to Next Paint (INP) responsiveness.
Viewer Path Example
// Input JSON
{
  "inventory": {
    "skus": ["SKU-01", "SKU-02"]
  }
}
// Copied Absolute Node Path
inventory.skus[1]
// Returns: "SKU-02"
FAQ

Frequently asked questions.

Is CSV a JSON file?
No, CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are completely different file formats. CSV represents structured tabular data in rows and columns. JSON is a hierarchical, key-value data format. You can convert between them instantly using our [CSV to JSON Converter](/csv-to-json/) and [JSON to CSV Converter](/json-to-csv/).
How do I create my own JSON file?
You can create your own JSON file by writing structured JSON text in any text editor and saving the file with a .json extension. The text must follow valid JSON syntax rules. To check your syntax, use our [JSON Validator](/json-validator/).
How accurate is the converter?
Our converter is highly accurate. It correctly handles complex structures while automatically inferring appropriate data types. To ensure structural integrity, you can validate your files using the [JSON Validator](/json-validator/) and [CSV Validator](/csv-validator/).
Are there any limitations to the converter?
Since the converter runs 100% in your browser for privacy, it uses your local system's memory. While we use Web Workers to process files up to 100MB, extremely large files are better suited for command-line utilities. You can inspect parsed tree nodes in our [JSON Viewer](/json-viewer/).
What is the JSON Viewer?
The [JSON Viewer](/json-viewer/) is a clean, interactive tool to inspect structured JSON documents. It parses your input and displays it in a collapsible tree hierarchy, making it easy to analyze deeply nested APIs, keys, and schemas directly in your browser.
Can I search for specific keys or values in the JSON Viewer?
Yes. The [JSON Viewer](/json-viewer/) has separate real-time search inputs for keys and values. Typing a query will automatically filter the tree nodes, highlight all matches with a yellow background, and expand the collapsible sections that contain them.
Can the JSON Viewer open very large files?
Yes, our online [JSON Viewer](/json-viewer/) is optimized to open files up to 50MB directly in the browser. It renders collapsed nodes dynamically so that the DOM remains small, preventing screen freezes.
How does this compare to a Chrome JSON Viewer extension?
While browser extensions auto-format every raw JSON page you visit, this web utility is an active inspector. It provides deep text search filters, path copying (like user.address.zipcode), and tree node count metrics, all without installing third-party plugins.
Can I convert the viewed JSON directly into a CSV?
Yes! If the JSON data inside the [JSON Viewer](/json-viewer/) is flat or represents a list of uniform objects, you can click the export links to navigate to our [JSON to CSV Converter](/json-to-csv/) to get a spreadsheet immediately.