JSON Viewer
JSON Viewer - a browser-based file tools utility.
Browser tool
About JSON Viewer
Opening JSON as a collapsible tree, which is how you find one field in a payload of several thousand lines without counting brackets. Parse errors are reported where they occur rather than as a general complaint. Free, online, and usable without registering. The payload is parsed in your browser, so nothing is uploaded, however sensitive it happens to be.
How to use it
- Paste the JSON or open a fileAn API response, a configuration file, an export.
- Fold away the branches you do not needHowever deeply the document nests, collapsing sections keeps its overall shape navigable.
- Read the error position when it failsA syntax error names where parsing stopped, which is usually just past the real mistake.
The JSON rules that catch people
No trailing commas, no comments, keys must be double-quoted strings, and single quotes are not valid anywhere. Most of these are legal in JavaScript object literals, which is exactly why they slip into hand-edited JSON — the syntax looks familiar and is stricter than it appears.
What it does not do
- Everything is parsed in the tab, so an enormous file is limited by available memory and not by a server.
- Parsing successfully is not the same as being right. Whether the keys and values match what your code is expecting is a question this cannot answer.
Questions people ask
- Why does my JSON fail to parse?
- Most often a trailing comma after the last item, a comment, or single quotes instead of double. All three are fine in JavaScript and invalid in JSON, which is what makes them so easy to introduce.
- Is my data uploaded?
- No. The payload is read entirely inside your browser, which is the property you want when it contains real customer data.
Questions about ToolsVerse itself — privacy, cost, what happens to your files — are answered in the frequently asked questions.
Related tools
The tools people most often need alongside JSON Viewer.
Can’t find the tool you need?
Tell us what you’re looking for and we’ll consider adding it.