JSON to One Line
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Indented JSON is for reading; one-line JSON is for moving around. A curl command, a shell environment variable, a log entry, or a single-line config value all want the whole document on one row, and pasting a pretty-printed block into any of them either breaks the command or produces multi-line output nobody can grep. This tool collapses a formatted document into a single line by removing every byte of whitespace that sits between tokens, while leaving whitespace inside string values untouched — so your data is preserved exactly and only the formatting disappears. Paste the indented version, copy the compact one, and drop it wherever a single line is required. It validates as it goes, so a malformed document tells you where it broke rather than silently producing garbage, and the whole operation runs in your browser so nothing is uploaded.
Features
- Collapses formatted JSON onto a single line
- Removes newlines, indentation, and separator spaces
- Preserves whitespace inside string values exactly
- Validates the input and reports parse errors
- Output is safe for curl, shell variables, and log lines
- One-click copy of the compact result
- Handles large documents instantly
- Entirely client-side — no upload
Why use this json to one line?
- Makes JSON safe to paste into single-line contexts
- Reduces payload size for transport and storage
- Keeps string contents byte-for-byte identical
- No server round-trip, so results are immediate
- Free with unlimited use
Frequently asked questions
Does collapsing JSON to one line change the data?
No. Only whitespace between tokens is removed. Whitespace inside string values is preserved, so the parsed result is identical to the original.
Why do I need single-line JSON?
Shell commands, environment variables, log lines, and some configuration formats treat a newline as a terminator, so a multi-line payload breaks them. One line avoids that.
Is this the same as minifying JSON?
Effectively yes — both remove insignificant whitespace to produce the most compact valid representation of the document.
How do I expand it again?
Use the JSON Pretty Print or JSON Formatter tool to re-indent the document whenever you need to read it.
Will newlines inside my strings be removed?
No. A newline inside a string value is part of your data and is preserved as its escape sequence, not stripped.
Is my JSON uploaded?
No. The conversion runs in your browser and the document is never transmitted or stored.