What is JSON Data Manager?

JSON Data Manager is a free online JSON editor that converts JSON schemas into structured forms, giving you a table view, live validation, and a Monaco code editor — so you can edit JSON data safely without syntax errors.

Is JSON Data Manager free?

Yes, JSON Data Manager is completely free to use. No signup is required to import and edit JSON. Cloud save requires a free account.

Do I need to install anything to use the JSON editor?

No installation required. JSON Data Manager runs entirely in your web browser at jsondata.net.

What types of JSON files can I edit?

You can edit any valid JSON file — arrays of objects, nested objects, config files, inventory data, manifests, and more. Files up to 1MB are supported for cloud save, with no size limit for local editing.

How does schema-based editing work?

When you import a JSON file, the tool automatically infers a JSON Schema from your data. This schema drives the form fields — giving you dropdowns, checkboxes, and number inputs instead of raw text, which prevents typos and invalid values.

Can I edit nested JSON objects and arrays?

Yes. JSON Data Manager handles deeply nested structures. Arrays of objects render as editable tables, and nested objects render as expandable forms — at any depth.

How do I edit a large JSON file online without breaking it?

Import your JSON file into JSON Data Manager at jsondata.net. The tool parses it into a structured table or form view so you edit individual fields rather than raw text — making it impossible to accidentally delete a bracket or misplace a comma. Local editing has no file size limit.

Can I use this as a JSON config file editor?

Yes. JSON Data Manager is well-suited for editing app config files, package.json, manifest files, and other structured JSON configs. The schema inference automatically maps your config structure to appropriate form fields, and live validation flags any invalid values before you export.

Is there a free alternative to paid JSON editors like Dadroit or JSON Editor Online?

JSON Data Manager is a completely free browser-based alternative. It offers a Monaco code editor (the same engine used in VS Code), schema-driven forms, table view, tree view, and cloud save — all at no cost and with no installation required.

How do I validate JSON against a schema online?

Import your JSON file into JSON Data Manager, then import or paste your JSON Schema in the Schema tab. The tool runs live AJV validation and highlights every error in real time, showing you exactly which field failed and why.

Can I edit JSON data like a spreadsheet?

Yes. When your JSON is an array of objects, JSON Data Manager displays it as a table — similar to a spreadsheet. Each row is a record and each column is a field. You can edit, clone, or delete rows, and changes sync back to the JSON editor instantly.

Does JSON Data Manager work with game data or RPG item databases?

Yes. JSON Data Manager is great for managing structured game data like item databases, enemy stats, level configs, and quest manifests. The table view makes it easy to manage dozens of entries, and the schema validation ensures fields like damage, health, or category always have the right type.

How do I fix JSON syntax errors online?

Paste your broken JSON into JSON Data Manager's code editor. The Monaco editor highlights syntax errors inline with the exact line and character position of the problem. Fix the error and the parse error banner clears immediately.

Edit JSON data
without the typos.

A schema-driven online JSON editor that gives you structured forms, live validation, and a table view — so you spend less time debugging JSON and more time shipping.

Everything you need to manage JSON data

Stop editing raw JSON by hand. Let the schema do the work.

Table View

See your data as a clean, sortable table. Edit, clone, or delete any row in one click.

Live Schema Validation

Errors are highlighted in real time as you type. Invalid data never slips through.

Schema-Driven Forms

Import a JSON Schema and get a structured form — dropdowns, checkboxes, number fields — auto-generated from your schema.

Tree View

Explore deeply nested JSON in a collapsible tree. Great for complex config files and manifests.

Cloud Save

Import & Export

Drag in any .json file to start editing immediately. Export back to clean, formatted JSON.

How it works

1. Import your JSON

Paste JSON directly into the editor, or import a .json file. A schema is automatically inferred from your data structure.
2. Edit with confidence

Use the table view to edit rows, or switch to the form view for field-by-field editing with live validation. The JSON editor stays in sync at all times.
3. Export clean data

Download your edited JSON as a formatted file, or save the project to the cloud to pick up where you left off.

Frequently asked questions

What is JSON Data Manager?: A free online JSON editor that converts JSON schemas into structured forms, giving you a table view, live validation, and a Monaco code editor — so you can edit JSON safely without syntax errors.
Is it free?: Yes. No signup is required to import and edit JSON. Cloud save requires a free account.
Do I need to install anything?: No installation required. JSON Data Manager runs entirely in your browser at jsondata.net.
What types of JSON files can I edit?: Any valid JSON — arrays of objects, nested objects, config files, inventory data, manifests, and more.
Can I edit nested JSON objects and arrays?: Yes. Nested arrays of objects render as editable tables, and nested objects render as expandable forms — at any depth.
How do I edit a large JSON file online without breaking it?: Import your file into JSON Data Manager. The structured table and form views let you edit individual fields rather than raw text — making it impossible to accidentally delete a bracket or misplace a comma.
Can I use this as a JSON config file editor?: Yes — package.json, app configs, manifests, and any structured JSON config. Schema inference maps your config structure to appropriate form fields with live validation.
Is there a free alternative to paid JSON editors like Dadroit or JSON Editor Online?: JSON Data Manager is a completely free browser-based alternative with Monaco editor, schema-driven forms, table view, tree view, and cloud save — no cost, no installation.
Can I edit JSON data like a spreadsheet?: Yes. Arrays of objects display as a table — each row is a record, each column is a field. Edit, clone, or delete rows and changes sync to the JSON editor instantly.
How do I fix JSON syntax errors online?: Paste your broken JSON into the Monaco editor. Syntax errors are highlighted inline with the exact line and character position. Fix it and the error clears immediately.

Edit JSON datawithout the typos.