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JSON to One Line
Convert valid JSON to one physical line locally
Validate JSON and serialize it onto one physical line for copying or JSON and text downloads, entirely in your browser.
Result
One-line JSON output
No output yet.
Processing stays inside this browser.
Instructions
How to use JSON to One Line
Paste or choose JSON and select Create one-line JSON. The output remains a JSON document rather than a quoted JSON string.
Real input and output example
A multi-line {"items":[1,2]} document becomes {"items":[1,2]} with no physical newline characters.
Diagnostics and limitations
What this tool reports clearly
Newlines inside JSON string values remain safely represented as escape sequences. They are not physical output line breaks.
Privacy
Files are read with browser APIs and processing runs in a dedicated local Worker. Your JSON is never placed in a network request.
FAQ
Common question
How is this different from JSON Stringify?
One-line JSON remains a JSON object, array or primitive. JSON Stringify wraps a whole document inside a quoted string literal.