Expected minifier behaviour
This tool is functionally identical to a JSON minifier.
Fix: Use whichever name matches your workflow — both produce the same output.
JSON to One Line
Collapse formatted JSON into a single compact line — great for config files and env vars
Input
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Output
Output will appear here...
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What is JSON to One Line
Written by Giorgos Kostas. Last reviewed:
JSON to One Line parses your JSON and re-emits it with no whitespace between tokens, producing the most compact representation possible.
It's the go-to format for embedding JSON in shell commands, environment variables, HTTP headers, or configuration files that disallow multi-line content.
Why use it
- Embed JSON in Docker or Kubernetes environment variables.
- Pass JSON payloads through curl or shell scripts.
- Shrink fixtures for logging or analytics.
- Produce single-line snippets for chat or documentation.
- Reduce request body size before compression.
Features
- Removes all whitespace
- Preserves key order
- Validates JSON before collapsing
- Processes JSON to One Line locally in your browser, no upload required
- Handles deeply nested structures
How to use JSON to One Line
- Paste JSON. Drop any formatted JSON.
- Click Run. Whitespace and newlines are removed.
- Copy the single-line output. Paste into shell, env vars, or HTTP headers.
Example (before/after)
Multi-line JSON
{
"id": 7,
"name": "Ada"
}One-line JSON
{"id":7,"name":"Ada"}Common errors
Invalid JSON input
Malformed JSON can't be collapsed.
Fix: Run JSON Fixer first.
FAQ
How is this different from json-minifier?
Functionally they are the same. This page focuses on the 'one-line' phrasing for SEO.
Is key order preserved?
Yes — insertion order is kept.
Does it escape Unicode?
No — output is UTF-8 and mirrors JavaScript's JSON.stringify.
Is input uploaded?
No — processing runs entirely in your browser.
Can it handle very large JSON?
Yes, though multi-megabyte inputs may pause the browser briefly.
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Pair the one-line converter with the formatter, minifier, and sorter for clean round-trips. You can also browse the full Minifiers category for more options.
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