JSON Minify Pretty
JSON minify/pretty
Format or minify valid JSON instantly with strict parsing and local-only processing.
Output snapshot
98chars
Root type: object. Pretty output uses 2-space indentation.
72
Input
98
Output
1
ms
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Input length
72
Output length
98
Pretty baseline
98
Minified baseline
72
Policy
Strict parse only. Invalid JSON is rejected, never auto-repaired.
Sort keys rewrites object-key order recursively.
LaTeX formula
\text{Pretty JSON}=\text{Stringify}(\text{Parse}(\text{input}),\ \text{indent})Step-by-step
- Step 1: Parse JSON input strictly.
- Step 2: Preserve original object key order.
- Step 3: Stringify with 2-space indentation.
Self-check score: 88/100 • Good confidence
Live updates enabled.
Flow
- Both modes parse the input first, so invalid JSON is rejected before output.
- Pretty mode serializes parsed JSON with two-space indentation and newlines.
- Minify mode serializes parsed JSON without extra whitespace.
Example
Worked example: compact JSON to formatted JSON
- 1 Input = {"name":"Ada","roles":["dev","admin"]}
- 2 Parser validates and converts text to a JSON object.
- 3 Pretty output adds indentation and line breaks for readability.
Formatted output becomes a multi-line JSON block with two-space indents.
How
- Choose Pretty to format compact JSON, or Minify to compress formatted JSON.
- Paste valid JSON in the active input area.
- Copy the transformed output or reset the current mode input as needed.
Avoid
- Using single quotes instead of double quotes for JSON keys or string values.
- Leaving trailing commas in arrays or objects, which JSON does not allow.
- Pasting JavaScript objects with comments and expecting JSON parsing to succeed.
FAQ
Is my JSON sent to any server?
No. Minify and pretty-print transformations run locally in your browser.
Why does the tool show an invalid JSON error?
The parser enforces strict JSON syntax. Common issues include trailing commas and single quotes.
Can this format very large JSON documents?
Yes for normal browser limits, but very large payloads may feel slower depending on device memory and CPU.
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