JSON Formatter & Beautifier — What is jsonview.dev?
jsonview.dev is a free online JSON formatter and visual editor. Paste any raw or minified JSON to instantly format, beautify, and validate it — then edit fields directly in an interactive tree view. No installation, no account required.
Key Features of this JSON Formatter
- JSON formatter & pretty-printer — instantly format and indent any raw or minified JSON
- JSON beautifier — syntax-highlighted output with collapsible nodes
- JSON validator — syntax errors are caught and reported immediately on paste
- Visual tree editor — add, rename, delete, and reorder fields with drag-and-drop
- Type switcher — toggle any field between string, number, boolean, null, object, and array
- Import JSON — paste raw JSON and watch it parse into an editable tree instantly
- Import JSON Schema — scaffold a JSON structure from a draft-04/07 schema definition
- Export JSON Schema — generate a schema from your current tree with one click
- Random value generator — populate fields with semantically appropriate sample data
- Field search — filter visible nodes by key name (Ctrl+F / ⌘F)
- Compact & pretty modes — toggle between minified and indented output
- One-click copy — copy the full JSON to clipboard instantly
- Runs 100% in-browser — your data never leaves your machine
How to Format JSON Online
- Paste any raw or minified JSON into the editor — it will be formatted and pretty-printed instantly.
- Or click + Field to build a new JSON structure from scratch.
- Click the type badge (e.g. str, num) next to any field to change its type.
- Use ↳ to add a child field inside an object, or + to add a sibling.
- Drag the ⠿ handle to reorder fields within the same level.
- Click ⚄ Random to fill all primitive fields with smart sample values.
- Click Copy to copy the formatted JSON output to your clipboard.
JSON Formatter FAQ
Is this JSON formatter free?
Yes. jsonview.dev is completely free with no usage limits, no account, and no install.
Does my JSON get sent to a server?
No. The formatter runs entirely in your browser. Your JSON is never transmitted or stored on any server.
What JSON Schema versions are supported?
JSON Schema draft-04 and draft-07 (subset). $ref is not supported — please dereference before importing.
Can I use this to validate JSON?
Yes. The formatter catches syntax errors immediately when you paste JSON and highlights the problem. For full schema validation, export the JSON Schema and run it against a dedicated validator.
What browsers are supported?
Any modern browser: Chrome, Firefox, Safari, Edge. JavaScript must be enabled.