JSON Viewer
JSON Viewer
Paste input, adjust settings if needed, then run.
Inspect and normalize JSON payloads with strict or lenient parsing and configurable indentation.
Result size
0chars
Run to update output.
Output summary
0 chars
More actions
Input: manualFile input
Choose a file
Click, drop, or paste from clipboard.
Settings
Status
Waiting for output.
Health 55/100
JSON Viewer policy
Viewer mode supports strict parsing and optional lenient normalization while preserving JSON value semantics.
Parse mode choice
LOW riskStrict mode validates raw JSON only; lenient mode normalizes comments/single quotes/unquoted keys/trailing commas before parsing.
Formatting scope
LOW riskOutput is formatted with configurable indentation and does not mutate primitive/object/array values.
Duplicate key caveat
MEDIUM riskDuplicate keys remain parser-sensitive (last value wins) and are surfaced as diagnostic metadata in helper text.
Result sizeLive
0chars
Run to update output.
Copy result = output only. Copy report = output + settings.
Privacy note
Flow
- Choose strict parse or lenient normalization before parsing.
- Render pretty output with selected indentation.
- Return readable JSON or a precise parse error location.
Example
Worked example: one-line API response
- 1 Input: {"ok":true,"items":[{"id":1,"name":"A"}]}
- 2 Viewer parses and pretty-prints with indentation.
- 3 Output is easy to scan and ready to share.
You can spot nested keys and values without manual spacing.
How
- Paste JSON into the input panel.
- Choose parse mode (strict or lenient) and run viewer mode to format and validate.
- Copy formatted JSON or open related JSON tools for deeper edits.
Cases
- Review API responses during debugging sessions.
- Clean JSON before sharing in tickets and pull requests.
- Quickly verify if copied payloads are valid JSON.
Avoid
- Using strict mode with JavaScript-style comments/trailing commas and expecting parse success.
- Using lenient mode for payloads that are semantically broken, not just syntactically messy.
- Ignoring parser error positions when fixing malformed payloads.
FAQ
Does json viewer send my input to a server?
No. JSON Viewer handles the input in your browser whenever possible, so routine conversions, previews, and copy actions stay on your device instead of being sent to Calctrove servers.
What is the difference between JSON Viewer and JSON Validator?
Viewer focuses on readable output and inspection, while Validator focuses on strict diagnostic workflows and validation controls.
Can this open very large JSON files?
Yes within browser memory limits. Very large payloads may render slower on low-RAM devices.
Switch
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