JSON Formatter & Validator | jsonview.dev

jsonview.dev JSON Workspace

jsonview.dev is a browser-based JSON workspace to view, format, repair, compare, convert, and inspect JSON online with Miller columns.

What You Can Do with jsonview.dev

Inspect nested JSON with a linked editor and Miller columns workflow.
Repair malformed JSON from AI responses, logs, APIs, and hand-edited snippets.
Format, validate, and minify JSON with inline error feedback.
Convert JSON into YAML, XML, CSV, and TOML output.
Escape and unescape JSON strings when text needs to be embedded in payloads, logs, or tests.
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?

jsonview.dev is a browser-based JSON workspace for inspecting deeply nested JSON, formatting and validating payloads, repairing malformed snippets, converting formats, escaping strings, and comparing documents.

What makes jsonview.dev different from a normal JSON viewer?

Most JSON viewers focus on tree views or pretty printing. jsonview.dev is inspector-first, with Miller columns, linked editor selection, path-aware navigation, and companion tools for repair, formatting, conversion, escaping, and diff work.

What are Miller columns in a JSON viewer?

Miller columns show each level of a nested object or array in its own column, so parent, current, and child context stay visible as you move through complex JSON.

Can I format and validate JSON online?

Yes. The JSON Formatter can beautify, minify, and validate JSON with inline parsing feedback.

Can jsonview.dev repair invalid JSON?

Yes. The JSON Repair tool can help fix common issues such as trailing commas, comments, single quotes, unquoted object keys, missing brackets, markdown code blocks, and extra prose around AI-generated JSON snippets.

Can I convert JSON to YAML, XML, CSV, or TOML?

Yes. The JSON Converter exports JSON into YAML, XML, CSV, and TOML in a live split workspace.

Can I compare two JSON files?

Yes. The JSON Diff tool compares two documents side by side, highlights changes, and can hide unchanged sections.

Can I escape and unescape JSON strings?

Yes. The Escape workspace converts raw text into JSON escaped strings and decodes escaped JSON string content back into readable text.

Does jsonview.dev support large JSON files?

Yes. jsonview.dev includes a large-file mode for cases where full structural rendering would be too heavy.

Validation Results

Ready for validation

Validation updates automatically after you pause typing.

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

1Pretty print JSON with consistent indentation for readability.
2Validate JSON with inline parsing feedback and precise error states.
3Minify JSON for compact payloads and export-ready output.
4Review 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.