JSON Editor (jsoneditor.io) is a free online tool for editing, formatting, validating, and converting JSON data. It provides a VS Code-like editing experience with Monaco Editor, offering syntax highlighting, real-time error detection, auto-completion, and AI-powered assistance. Unlike desktop applications, it runs entirely in your browser with no installation required.

Is JSON Editor free to use?

Yes, jsoneditor.io is completely free to use with no signup, registration, or credit card required. All features including JSON formatting, validation, minification, and conversion to YAML/CSV/TypeScript are available at no cost. There are no usage limits or premium tiers.

What formats can JSON Editor convert to?

JSON Editor supports bidirectional conversion between JSON and multiple formats: JSON to YAML (and YAML to JSON), JSON to CSV (ideal for spreadsheet export to Excel or Google Sheets), and JSON to TypeScript type definitions (for generating TypeScript interfaces from JSON data). All conversions happen instantly in your browser.

Is my data safe with JSON Editor?

Yes, your data remains completely private. All JSON processing happens locally in your browser using client-side JavaScript. Your data is never uploaded to any server, never stored, and never shared with third parties. This makes jsoneditor.io safe for working with sensitive or confidential data.

How do I format JSON online?

To format JSON online: 1) Go to jsoneditor.io, 2) Paste your unformatted or minified JSON into the editor, 3) Click the "Format" or "Pretty" button in the toolbar. Your JSON will be instantly beautified with proper indentation, line breaks, and spacing. You can also use keyboard shortcuts (Shift+Alt+F) to format quickly.

How do I validate JSON?

JSON validation at jsoneditor.io is automatic. Simply paste your JSON into the editor, and it will instantly highlight any syntax errors with red underlines. Hover over errors to see detailed descriptions of what went wrong (missing commas, unmatched brackets, invalid characters, etc.). The editor also suggests fixes for common JSON errors.

What is the best free JSON editor online?

jsoneditor.io is widely considered one of the best free JSON editors online. It combines a professional VS Code-like interface (Monaco Editor), comprehensive features (format, validate, convert, compare), AI assistance for complex transformations, and complete privacy (all processing happens in your browser). It works on any device with a modern web browser.

Can I convert JSON to YAML online?

Yes, jsoneditor.io provides instant JSON to YAML conversion. Paste your JSON data, click Convert, and select "JSON to YAML". The conversion preserves your data structure while reformatting it into valid YAML syntax. You can also convert YAML back to JSON using the same tool.

How do I convert JSON to CSV for Excel?

To convert JSON to CSV for Excel: 1) Go to jsoneditor.io, 2) Paste your JSON array (must be an array of objects), 3) Click Convert and select "JSON to CSV". The tool automatically flattens nested objects and creates column headers from your JSON keys. Download the CSV file and open it directly in Excel or Google Sheets.

Does JSON Editor work offline?

While jsoneditor.io is a web application that requires an initial internet connection to load, most of its functionality works after the page loads since all processing happens in your browser. For fully offline JSON editing, the page can be cached by your browser for subsequent offline use.

JSON Editor Online - Free JSON Formatter, Validator & Converter

Last updated: January 2026

1. Introduction

Welcome to jsoneditor.io, a product of Polyxmedia Ltd. We are committed to protecting your privacy and ensuring you have a positive experience on our website. This policy outlines our data handling practices.

2. Information We Collect

Local Storage: jsoneditor.io stores your JSON documents and editor preferences locally in your browser. This data never leaves your device unless you explicitly choose to share it.

Usage Analytics: We may collect anonymous usage statistics to improve our service. This does not include any of your document content.

3. How We Use Your Information

We use the information we collect to:

Provide and maintain our service
Improve and personalize your experience
Analyze usage patterns to enhance our features
Communicate with you about updates or changes

4. Data Security

Your data security is important to us. Documents stored locally remain on your device and are not transmitted to our servers. We implement appropriate security measures to protect any data you choose to store in the cloud.

5. Third-Party Services

Our service may include integrations with third-party services (such as AI assistants). When you use these features, your data may be processed by these third-party providers according to their respective privacy policies.

Advertising: We use Google AdSense to display advertisements on our website. Google AdSense uses cookies and similar technologies to serve ads based on your prior visits to our website or other websites. Google may use the data collected to contextualize and personalize the ads of its own advertising network. You can opt out of personalized advertising by visiting Google Ads Settings. For more information about how Google uses your data, please visit Google's Privacy & Terms.

6. Cookies

We use cookies and similar tracking technologies on our website. These include:

Essential cookies: Required for the website to function properly and to remember your preferences.
Analytics cookies: Help us understand how visitors interact with our website, allowing us to improve the user experience.
Advertising cookies: Used by Google AdSense and other third-party advertisers to serve relevant ads based on your browsing history and interests. These cookies may track your activity across different websites.

You can control cookie preferences through your browser settings. Note that disabling certain cookies may affect the functionality of the website. To opt out of personalized advertising, visit Your Ad Choices or NAI Consumer Opt-Out.

7. Your Rights

You have the right to:

Access your personal data
Request deletion of your data
Opt out of analytics collection
Export your locally stored data

8. Contact Us

If you have any questions about this Privacy Policy, please contact us at hello@polyxmedia.com

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last updated" date.