A JSON file (.json) is a plain-text file that stores structured data, such as app settings, exported data, or information passed between programs. Because it is just text, you can open it on Windows 10 with tools you already have, like Notepad or your web browser, or use a code editor for easier reading and editing. This guide covers every option, how to make JSON readable, and how to set a default app for .json files.
Quick Answer
Right-click the JSON file, choose Open with, and pick Notepad to view or edit it. For a formatted, easy-to-read view, drag the file into Microsoft Edge or Firefox. For regular editing, install a free code editor such as Visual Studio Code.
Which App Should You Use?
| App | Best for | Pros | Cons |
|---|---|---|---|
| Notepad | Quick view or small edits | Built in, fast | No formatting or error checking |
| Web browser | Reading JSON | Built in; Firefox and Edge can show formatted, collapsible JSON | Read-only |
| Code editor (VS Code, Notepad++) | Editing and validating | Syntax colors, formatting, error highlighting | Needs installing |
| Excel or Power Query | Tabular data in JSON | Turns JSON into rows and columns | Setup takes a few steps |
Method 1: Open With Notepad
- Find the .json file in File Explorer.
- Right-click it and choose Open with.
- Click Notepad. If it is not listed, click Choose another app, scroll to Notepad, and click OK.
Minified JSON may appear as one long line. Turn on Format > Word Wrap to see it all, or use a browser or code editor for a formatted view.
Method 2: Open in a Web Browser
- Open Firefox, Microsoft Edge, or Chrome.
- Drag the JSON file into the browser window, or press Ctrl + O and select it.
Firefox shows a built-in JSON viewer with collapsible sections, a raw view, and a filter. Newer versions of Edge can also format JSON with a Pretty-print option. In other browsers, you may see plain text unless you add a trusted JSON viewer extension.
Method 3: Use a Code Editor
- Install a free editor such as Visual Studio Code or Notepad++ from its official website.
- Right-click the JSON file and choose Open with > [editor name].
- In VS Code, press Shift + Alt + F to format the document. Errors, such as a missing comma, are underlined.
Code editors are the best choice if you need to edit configuration files, since a single misplaced comma or quote can make the JSON invalid.
Method 4: Import JSON Into Excel
- Open Excel and go to Data > Get Data > From File > From JSON.
- Select the file and click Import.
- In the Power Query Editor, click To Table, expand the columns, and click Close & Load.
This works best for JSON that contains a list of similar records. The From JSON option is available in Excel 2016 and later, including Microsoft 365.
Set a Default App for JSON Files
- Right-click any .json file and choose Open with > Choose another app.
- Select the app you want.
- Check Always use this app to open .json files and click OK.
You can also go to Settings > Apps > Default apps > Choose default apps by file type and set an app for .json.
Tips for Editing JSON Safely
- Back up first: copy the file before editing, especially app or game settings.
- Keep the syntax valid: use double quotes around keys and text, commas between items, and no trailing comma after the last item.
- Validate it: code editors highlight errors; you can also use a validator tool, but avoid pasting sensitive data into websites.
- Save with UTF-8 encoding: in Notepad, choose Save As and select UTF-8.
Frequently Asked Questions
What program opens JSON files on Windows 10?
Notepad and web browsers open them without extra software. Code editors like Visual Studio Code are best for editing.
Is it safe to open a JSON file?
Yes. JSON is plain text and does not run code when opened in a text editor or browser.
Why does my JSON file open in a strange app?
Another program set itself as the default. Change it with Open with > Choose another app.
Can I convert JSON to CSV?
Yes. Import it into Excel with Power Query, then save as CSV.
Summary
- Right-click the file and choose Open with > Notepad for a quick look.
- Drag it into Firefox or Edge for a formatted, read-only view.
- Use a code editor for editing and error checking.
- Set a default app so .json files always open the way you want.
Kermit Matthews is a freelance writer based in Philadelphia, Pennsylvania with more than a decade of experience writing technology guides. He has a Bachelor’s and Master’s degree in Computer Science and has spent much of his professional career in IT management.
He specializes in writing content about iPhones, Android devices, Microsoft Office, and many other popular applications and devices.