Online JSON Inspector and Validator

jsonview.dev is a browser-based JSON viewer, JSON formatter, JSON validator, JSON diff, and JSON converter for JSON to CSV, YAML, and XML workflows. Inspect, pretty print, minify, search, and compare JSON locally with a fast developer-friendly workspace.

What You Can Do with jsonview.dev

Inspect nested JSON with a linked editor and Miller columns workflow.
Format, validate, and minify JSON with inline error feedback.
Convert JSON into YAML, XML, CSV, or Base64-friendly output.
Compare two JSON documents side by side with diff navigation and review controls.
Work through complex JSON data in a clean, focused developer workspace.

How to Use the JSON Viewer

Paste JSON or drag and drop a .json file into one of the workspaces.
Choose the right tool to inspect, format, convert, or compare the document.
Review the output, navigate structure, and export the result you need.

FAQ

What is jsonview.dev useful for?

jsonview.dev is useful for inspecting, formatting, validating, converting, and comparing JSON with a workflow designed for debugging, review, and day-to-day development.

Does jsonview.dev support large JSON files?

Yes. jsonview.dev includes a large-file mode that keeps the editor responsive and switches to a text-first workflow when full structure features would be too heavy.

What makes Miller columns useful in a JSON inspector?

Miller columns let you move through nested objects and arrays one level at a time, so deep JSON stays readable without losing context.

Can I search JSON by key or path?

Yes. JSON search helps you jump to matching keys, paths, and values, then syncs the result back into the editor and Miller view.

Can I format, convert, and diff JSON in the same app?

Yes. jsonview.dev includes dedicated formatter, converter, and diff workspaces so you can move between tasks without leaving the toolset.

INPUT.jsonReady for validation

Size: 0 BUTF-8

Validation Results

Ready for validation

Validation updates automatically after you pause typing.

Depth: 0Nodes: 0

Data Structure

Tree view becomes available once the document parses successfully.

JSON Formatter and Validator

The formatter workspace is designed for cleanup and validation. It helps you pretty print JSON, minify payloads, catch syntax errors, and review structure side by side while you edit.

Formatter Features

Pretty print JSON with consistent indentation for readability.
Validate JSON with inline parsing feedback and precise error states.
Minify JSON for compact payloads and export-ready output.
Review document structure in parallel while editing the source.

When to Use the Formatter

Clean up minified API responses before debugging.
Validate copied JSON snippets before using them in code or configs.
Prepare readable payloads for sharing in tickets or documentation.
Compress formatted JSON back into a minified transport form.

Formatter FAQ

Can I both format and validate JSON in this workspace?

Yes. The formatter workspace is built for both tasks, so you can fix invalid JSON and then pretty print or minify it in the same place.

Does the formatter show structure while I edit?

Yes. The page keeps structural feedback alongside the editor so you can move between raw text and parsed shape more easily.