The JSON Editor Built for Developers
JSONCraft is a free, fast, and private online JSON editor with everything you need: formatting, validation, tree view, minification, key sorting, flattening, and conversion to CSV/YAML. All processing happens in your browser — your data never touches a server.
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Instant Processing
Format, validate, and convert JSON of any size in milliseconds. Pure client-side JavaScript.
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Interactive Tree View
Explore JSON as a collapsible tree with syntax-colored values. Navigate nested structures easily.
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100% Private
Your data stays in your browser. No server calls, no logging, no analytics on your JSON content.
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JSON → CSV / YAML
One-click conversion to CSV for spreadsheets or YAML for configuration files.
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Error Pinpointing
Get precise, human-readable error messages that tell you exactly what's wrong and where.
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Works Everywhere
Fully responsive — use on desktop, tablet, or phone. Keyboard shortcuts included.
Frequently Asked Questions
What is a JSON editor?
A JSON editor is a tool that lets you view, edit, format, and validate JSON (JavaScript Object Notation) data. JSONCraft goes further by offering tree view, key sorting, flattening, and format conversion — all in one place.
Is my data safe when using JSONCraft?
Yes. All processing happens entirely in your browser using client-side JavaScript. Your JSON data is never sent to any server, never stored, and never logged. JSONCraft is 100% private by design.
What's the difference between Format and Minify?
Format (beautify) adds proper indentation and line breaks to make JSON human-readable. Minify removes all whitespace to create the smallest possible output — ideal for APIs, config files, and production payloads.
Can I convert JSON to CSV?
Yes! If your JSON is an array of objects, JSONCraft can convert it to CSV format that you can paste into Excel, Google Sheets, or save as a .csv file. Click the "→ CSV" button in the toolbar.
What does "Flatten" do?
Flatten takes nested JSON and converts it to a single-level object using dot notation for keys. For example, {"user": {"name": "John"}} becomes {"user.name": "John"}. Useful for data analysis and logging.
Is there a file size limit?
There's no hard limit since everything runs locally. Files up to ~10MB work well on most devices. Very large files may be slower but will still process. For huge files, consider using a native desktop tool.
What keyboard shortcuts are available?
Ctrl+Shift+F to format, Ctrl+Shift+C to copy output, Ctrl+Enter to format, and Tab for indentation in the input area. All shortcuts work with Cmd on Mac.
How to Use JSONCraft
Paste your raw JSON into the input panel on the left. Use the toolbar buttons to format, minify, validate, sort keys, flatten, or convert. Switch to Tree View in the output panel to explore nested data interactively. Copy or download the result when you're done.
Who Uses JSONCraft?
Web developers debugging API responses, DevOps engineers working with configuration files, data analysts cleaning datasets, QA testers validating payloads, and anyone who works with JSON data daily. JSONCraft is designed to be the fastest tool in your bookmark bar.
About JSONCraft
JSONCraft is a free online JSON editor, formatter, and validator built for developers who value speed, privacy, and simplicity.
Our Mission
We believe developer tools should be fast, free, and respectful of your data. JSONCraft processes everything in your browser — no data ever leaves your device. We sustain this free tool through non-intrusive advertising.
Features
JSONCraft includes JSON formatting/beautifying, minification, validation with error pinpointing, interactive tree view, key sorting, JSON flattening, JSON escaping/unescaping, JSON to CSV conversion, JSON to YAML conversion, file upload, file download, dark/light theme, and keyboard shortcuts.
Contact
Have feedback, bug reports, or feature requests? Email us at hello@jsoncraft.dev (replace with your email).
Privacy Policy
Last updated: March 2026
Overview
JSONCraft ("we", "us", "our") operates the jsoncraft.dev website. This page informs you of our policies regarding the collection, use, and disclosure of information when you use our website.
Data Processing
All JSON data you input into JSONCraft is processed entirely within your web browser using client-side JavaScript. Your JSON data is never transmitted to our servers or any third-party servers. We do not store, log, or have access to any JSON data you process using our tools.
Information We Collect
We do not collect personal information directly. However, our advertising partners and analytics providers may collect certain information automatically, including:
- IP address (anonymized where possible)
- Browser type and version
- Pages visited and time spent
- Referring website
- Device type
Advertising
We use Google AdSense to display advertisements. Google may use cookies and similar technologies to serve ads based on your prior visits to our website or other websites. You can opt out of personalized advertising by visiting Google's Ad Settings.
Cookies
We use cookies only for: storing your theme preference (dark/light mode) and through third-party advertising services (Google AdSense). You can disable cookies in your browser settings.
Third-Party Services
We use Google AdSense for advertising and may use Google Analytics for understanding site traffic. These services have their own privacy policies.
Children's Privacy
Our website is not intended for children under 13. We do not knowingly collect personal information from children.
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 policy on this page with an updated "last updated" date.
Contact
If you have any questions about this Privacy Policy, contact us at hello@jsoncraft.dev (replace with your email).