Explore as a tree
Objects and arrays become collapsible nodes annotated with their size, so you can drill into a deeply nested response instead of scrolling through it. Expand or collapse everything in one click.
JSON Viewer, Formatter & Validator
A fast, no-nonsense tool for reading JSON. Paste a payload into the editor above and it is parsed, validated and rendered as a collapsible tree — instantly, and without ever leaving your browser.
What this tool does
Format and beautify
Turn a single-line API response into readable, consistently indented JSON with two spaces per level — the layout most style guides and code reviewers expect.
Minify
Strip every optional space and line break to get the smallest possible payload, which is what you want before sending JSON over the wire or embedding it in a config value.
Validate as you type
The status line tells you immediately whether the document is valid, and on failure shows the parser's own message so you can find the offending character rather than guessing.
Your JSON stays on your machine
There is no upload step and no backend involved in the actual work. The document you paste is handled entirely by your browser's JSON parser, so nothing is transmitted, stored or logged on our side. That makes the tool usable for production payloads, access tokens and customer data that you would not want to paste into an online service in the first place.
Frequently asked questions
- Is this JSON viewer free to use?
- Yes. There is no account, no usage limit and no paywall.
- Is my JSON uploaded to a server?
- No. Parsing, formatting and validation all run in your browser via the built-in JSON parser. Your data never touches our servers, which also makes the tool safe for payloads you cannot share.
- What is the difference between formatting and minifying?
- Formatting re-indents the document with two spaces per level so a human can read it. Minifying strips every optional space and line break to make the payload as small as possible for transport.
- Why do I get an 'Unexpected token' error?
- That message comes from the JSON parser and means the document is not valid JSON. The usual causes are trailing commas, single quotes instead of double quotes, comments, or unquoted object keys.
- How large can a document be?
- The only limit is your browser's memory. Documents of a few megabytes render comfortably; beyond that the tree view starts to feel slow, so collapsing branches helps.
- Does it support JSON5, JSONC or comments?
- No. The parser follows the strict JSON specification, which is what makes it a reliable validator for APIs and config files.