JSON Editor Online
Paste or upload JSON, build a readable list of fields, edit nested values with their correct data types, and export the modified JSON. Validation, formatting and editing all run locally in your browser.
JSON Field Editor
Paste JSON, select Build Fields, edit the generated values, then create your output.
Input JSON
Paste JSON text or open a .json file up to 2 MB.
Ready for JSON input.
Editable fields
Build fields to list primitive values by JSON path.
Nested strings, numbers, booleans and null values will appear here.
Modified JSON
Copy, share or download the updated object.
How to edit JSON values online
1. Paste or upload JSON
Enter a complete JSON object or array. The syntax validator reports the line and column when parsing fails.
2. Build editable fields
The JSON object editor traverses nested objects and arrays and displays every primitive value with its path and data type.
3. Export modified JSON
Change field values, select Output JSON, then copy, share or download the updated JSON file.
Supported JSON field types
| JSON type | Editing behavior | Common usage |
|---|---|---|
| String | Editable text that remains quoted in output. | Names, IDs, URLs, dates, messages and API properties. |
| Number | Validated as a finite JSON number before export. | Counts, prices, ports, measurements and timestamps. |
| Boolean | A true/false checkbox avoids invalid spelling. | Feature flags, enabled states and configuration switches. |
| Null | Preserved as JSON null, or change its type to assign a value. | Missing, intentionally empty or unknown API data. |
| Object and array | The structure is preserved while its primitive descendants become editable. | Nested API responses, payloads, configuration and collections. |
JSON editor use cases
APIs and integration testing
Edit REST API JSON request bodies, response samples and webhook payloads while preserving nested arrays and value types.
DevOps and configuration
Review and modify application settings, deployment fixtures and structured test data before saving a new JSON file.
Development and debugging
Validate JSON syntax, pretty-print compact payloads, inspect JSON paths and change test values without writing a temporary script.
Limits: This JSON data editor changes existing primitive values; it does not rename, add or delete keys. Very large documents are better handled by a desktop code editor or streaming data tool.
JSON editor FAQ
How do I edit JSON online?
Paste or upload valid JSON, click Build Fields, change values in the field list, and select Output JSON. You can then copy, share or download the edited result.
Can I edit nested JSON objects and arrays?
Yes. This nested JSON editor lists primitive descendants using paths such as $.invoice.items[0].quantity and preserves the surrounding object and array structure.
Does the tool validate JSON syntax?
Yes. Build Fields, Validate, Format and Minify all parse the input. Invalid JSON is reported with an approximate line and column when the browser provides a character position.
What is the difference between formatting and minifying?
Formatting adds indentation and line breaks for readability. Minifying removes unnecessary whitespace for a compact representation. Neither operation changes JSON values.
Can I download the edited JSON?
Yes. Generate the output and select Download to save a UTF-8 modified.json file.
Is this a private browser JSON editor?
Parsing and editing run locally in the current browser tab. Your JSON is not sent to the website, but you should still avoid confidential data on shared or untrusted devices.