Is this JSON viewer free?

Yes. It runs in your browser for free and needs no registration or installation.

Are my JSON files uploaded?

No. Files opened from your device stay on your device. Only public sample files come from the server.

Does it support JSONC and JSON5?

Yes. The viewer handles standard .json as well as .jsonc (with comments) and .json5 (with comments, trailing commas, and unquoted keys).

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JSON Viewer

Free online JSON viewer. Open .json, .jsonc, and .json5 files directly in your browser without uploading them.

.json.jsonc.json5

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About this file format

.json (JavaScript Object Notation) is a lightweight, human-readable data interchange format defined by RFC 8259. It uses objects ({}) and arrays ([]) to structure data as key-value pairs and ordered lists. JSON is the de facto standard for web APIs, configuration files (package.json, tsconfig.json), and NoSQL databases. .jsonc adds comments for configuration, and .json5 relaxes syntax (unquoted keys, trailing commas, comments) for easier human editing.

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