Handytool
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JSON viewer

View, format and validate JSON in your browser.

.json
Indent
JSON
0 lines0 bytes

How to use the JSON viewer

  1. 01

    Paste your JSON

    Paste any JSON — API response, config file or database dump — into the editor pane.

  2. 02

    Format, minify or check

    Click Format to pretty-print with your chosen indentation, Minify to collapse to one line, or Check to validate without changing the input.

  3. 03

    Copy or download

    Copy the result to your clipboard or download it as a .json file. Nothing leaves your browser.

About the JSON viewer

Paste any JSON into Handytool's JSON viewer to read it cleanly, format it with your preferred indentation, minify it for transport, or check that it parses — all inside your browser. The viewer uses one large editable pane so you can paste, tidy and copy without juggling tabs. Nothing is uploaded, so API responses, config files and database dumps stay on your machine.

JSON viewer features

  • 01

    One pane, three actions

    Format pretty-prints your JSON in place, Minify collapses it to a single line, and Check confirms it's valid without changing a thing.

  • 02

    Configurable indentation

    Switch between 2-space, 4-space and tab indentation in one click. The viewer reformats immediately so you can match your project's style.

  • 03

    100% private, works offline

    Your JSON never leaves your device. Parsing runs in your browser with the native JSON engine, so the viewer keeps working even without a network connection.

JSON viewer FAQ

How do I view JSON in the browser?
Paste your JSON into the editor and click Format. The pane updates in place with a pretty-printed version using your chosen indentation. Nothing is uploaded — everything happens locally.
What does the Check button do?
Check parses your JSON without modifying it. If it's valid you'll see a confirmation; if not, you'll see the exact error message and the position where parsing failed.
Why is my JSON invalid?
Common causes are trailing commas, single quotes around strings, unquoted keys, or comments — none of which are allowed by the JSON specification. The error message highlights where parsing failed.
Is my JSON sent to a server?
No. The viewer runs entirely in your browser using JavaScript's built-in JSON parser. Your data is never uploaded, logged or stored.
Is there a size limit?
No hard cap, but very large documents (tens of megabytes) may take a moment to render. The viewer handles typical API responses and config files instantly.
Is the JSON viewer free?
Yes. Every Handytool is free, with no accounts, sign-ups or usage limits.

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