JSON Stringify Tool
Re-serialise JSON with custom indentation or escaping.
How to use
- 1 Paste your JSON into the input box.
- 2 Pick an indentation style: 2 spaces, 4 spaces, tabs, or minified.
- 3 Optionally enable “Escape as JSON string” for embedding.
- 4 Copy the re-serialised output.
About JSON Stringify Tool
The JSON Stringify Tool takes any valid JSON and re-serialises it exactly how you want it.
Paste in a payload and choose your indentation — two spaces, four spaces, tabs, or fully minified onto a single line — and the formatted result appears instantly on the right.
Because the tool actually parses your input first, it doubles as a quick validity check: malformed JSON is caught and explained rather than silently passed through.
A common but fiddly task is embedding one JSON document inside another, or storing JSON inside a string field where every quote has to be escaped.
The "Escape as JSON string" option does this for you: it wraps the output in quotes and escapes the inner characters, producing the kind of doubly-encoded value you often need for log lines, configuration files, or API fields that expect a JSON string rather than a JSON object.
Turn it off and you get clean, human-readable output instead.
This is the mirror image of parsing: where JSON.parse turns text into a value, JSON.stringify turns a value back into text, and this tool surfaces every knob that matters.
Everything runs locally in your browser, so even sensitive payloads never leave your machine, and it keeps working offline once loaded.
FAQ
What does the escape option do?
It returns the output as a quoted JSON string literal with inner quotes escaped, which is what you need when storing JSON inside another JSON string field.
Will it tell me if my JSON is invalid?
Yes. The tool parses your input first, so invalid JSON produces a clear error message instead of broken output.
How do I get minified, single-line JSON?
Choose the “Minified (single line)” indentation option to remove all whitespace from the output.