JSON Formatter
JSON Formatter
Format or minify JSON/NDJSON with sorting controls and large-payload friendly manual run mode.
Primary result
Formatted JSON ready
Auto-update is active.
More actions
Input: manual
Input: manualCopy full input/output report
Copy full input/output report
Conversion settings
Settings changes apply automatically.
Workspace status
Ready • 78 chars
Self-check score (heuristic): 88/100 • Good confidence
Performance: 1 ms transform • live debounce 320 ms.
Clear empties current input/output. Reset restores built-in defaults and settings.
Privacy
All processing happens in your browser. Your data is not uploaded.
Flow
- Parse JSON or NDJSON input and validate syntax.
- Apply selected output mode (formatted or minified).
- Optionally sort keys and use configured indentation for formatted output.
Example
Worked example: compact to formatted
- 1 Input: {"id":42,"name":"Ada"}
- 2 Parser builds object tree
- 3 Formatter outputs multi-line JSON
Output is easier to read and review.
How
- Paste JSON/NDJSON into the editor.
- Choose output mode, indentation, and key-sorting options.
- Run or use auto-update, then copy output for logs, commits, or docs.
Avoid
- Formatting input that is not valid JSON.
- Confusing formatting with key sorting.
- Assuming formatter repairs syntax errors automatically.
FAQ
Does formatter change JSON values?
No, it only changes whitespace presentation.
Can I minify and sort keys in one step?
Yes. Choose Minified output mode and enable Sort keys.
Can I format large payloads?
Yes, within browser memory limits; manual run mode helps keep large edits responsive.
Is this different from minifier?
Yes, formatter supports both readable formatting and minified output from one workspace.
Switch
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No match.