🔒 Runs in your browser — nothing is uploaded✓ Free, no signup
JSON Editor Online
Edit JSON with syntax highlighting and live validation, see it as a tree as you type, and format, minify or sort keys in one click.
Editor
When should you use the JSON Editor?
- Editing a config file such as package.json or tsconfig.json
- Tweaking an API request body before sending it
- Cleaning up JSON — format, minify or sort keys — then downloading it
How to use the JSON Editor
- 1
Edit your JSON
Type or paste into the editor. Brackets match, and errors are underlined as you type.
- 2
Check the status
The bar shows Valid JSON or Invalid JSON, and the error message appears under the editor.
- 3
Use the tools
Format pretty-prints, Minify compresses, and Sort keys orders every object alphabetically.
- 4
Save your work
Copy the JSON or download it as data.json.
Examples
Sort keys
Before
{ "version": "2.0.0", "name": "app", "private": true }After Sort keys
{
"name": "app",
"private": true,
"version": "2.0.0"
}Common errors and how to fix them
Format and Minify are greyed out- They only work on valid JSON. Fix the error shown under the editor first.
My changes disappeared- Nothing is saved automatically. Copy or download your JSON before leaving the page.
More from JSON Tools
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JSON Auto-Fixer & Formatter
Repair, validate, and beautify broken JSON (missing quotes, trailing commas).
JSON Validator & Linter
Check JSON syntax and see the exact line and column of every error.
JSON Viewer (Tree)
Explore JSON as a collapsible tree with search and click-to-copy paths.
JSON Beautifier
Pretty-print and indent JSON for easy reading and debugging.
JSON Compare & Diff Tool
Find the difference between two JSON objects visually and quickly.
JSON Sorter (Sort Keys)
Sort JSON object keys alphabetically, including nested objects.
JSONPath Tester
Evaluate JSONPath expressions with filters and recursive queries.
JSON Schema Generator
Generate a JSON Schema from any sample JSON document.
JSON to CSV Converter
Flatten nested JSON arrays into CSV for spreadsheets.
JSON Editor FAQ
Yes — free to use with no signup and no limits.
Yes. Errors are underlined in the editor and the status bar shows whether the JSON is valid.
It reorders the keys of every object alphabetically, including nested objects. Array order is left unchanged.
No — nothing is stored, for privacy. Use Copy or Download before you close the page.
Yes, files of several megabytes work well. The tree view may be slower for very large documents.
No. Everything runs in your browser, so your JSON never leaves your device.