How to Open a JSON File on Any Device

A .json file is just a plain text file containing structured data. The challenge is not opening it — it is reading it, because raw JSON is often a single unformatted line. This guide shows the easiest way to open and actually read a JSON file on Windows, Mac, in the browser, and in code editors.

What is a JSON file?

JSON (JavaScript Object Notation) is a text format for storing data as key-value pairs and lists. Because it is plain text, almost any program can open it — but most will not display it in a readable way.

Easiest: open it online (no software)

The quickest way to read a JSON file is to paste its contents into an online formatter. It instantly indents and color-codes the data, validates the syntax, and lets you collapse sections — without installing anything.

On Windows

• Notepad: Right-click → Open with → Notepad. Works, but shows raw text.
• Notepad++: Free editor with a JSON Viewer plugin that formats and folds the data.
• VS Code: Open the file, then press Shift+Alt+F to auto-format.
• Browser: Drag the file into Chrome or Firefox to see a collapsible tree.

On Mac

• TextEdit: Right-click → Open With → TextEdit.
• VS Code: Open and press Shift+Option+F to format.
• Terminal: Run cat file.json | python3 -m json.tool to pretty-print.

In VS Code (best for developers)

1. Open the .json file.
2. Press Shift+Alt+F (Windows) or Shift+Option+F (Mac) to auto-format.
3. Click the gutter arrows to collapse and expand sections.
4. VS Code underlines syntax errors in red automatically.

Why your JSON file looks like one giant line

JSON is often "minified" — all whitespace removed — to save space. This is valid JSON, just unreadable. Running it through a formatter restores the indentation so you can read it.

Common problems

• Garbled characters: The file may be in the wrong encoding. Open it as UTF-8.
• "Invalid JSON" when formatting: The file has a syntax error — a validator shows where.