JSON Lines Viewer
Inspect JSON Lines files where each non-empty line contains one complete JSON value.
- No login
- Free to use
- Processes locally
- No files uploaded
Try the JSON Lines Viewer
Processed locally in your browser
Your input and generated output are processed locally and are not sent to our servers for tool execution.
Examples
Basic object
{
"product": "UtilityKit",
"active": true,
"version": 2
}{
"product": "UtilityKit",
"active": true,
"version": 2
}Nested API-style payload
{
"user": {
"id": "usr_42",
"email": "ada@utilitykit.store",
"roles": ["editor", "billing"]
},
"meta": { "region": "in", "trial": false }
}{
"user": {
"id": "usr_42",
"email": "ada@utilitykit.store",
"roles": ["editor", "billing"]
},
"meta": { "region": "in", "trial": false }
}Features
- Validate and format structured JSON
- Inspect nested objects and arrays
- Copy or download cleaned JSON
- Works with realistic API-sized payloads in-browser
- No account required
How to use JSON Lines Viewer
- Paste JSON Lines and run the viewer. Valid lines become a readable JSON array; invalid line numbers are reported.
Use cases
- Inspect log exports
- Review NDJSON data
- Check streaming API output
Technical reference
| Property | Supported |
|---|---|
| Input | JSON text (UTF-8) |
| Output | Formatted / validated / transformed JSON or text |
| Execution | 100% client-side in a modern browser |
| Account | Not required |
| Upload destination | None — Open local file stays in-browser |
| Output actions | Copy and download when available |
Common errors & troubleshooting
Unexpected token / trailing comma
Cause: JSON does not allow trailing commas after the last property.
Fix: Remove the extra comma, or fix quotes, then run validation again.
Unclosed object or array
Cause: A `{`, `[`, or quote was opened without a matching closer.
Fix: Check brace balance and string quotes, then re-run.
Empty input
Cause: The editor is empty.
Fix: Paste JSON or use Load example before running JSON Lines Viewer.
Privacy and security
- Your input and generated output are processed locally and are not sent to our servers for tool execution.
- Opening a local file uses the browser File API; the file is not uploaded to UtilityKit.
- We may collect anonymous product analytics (for example page views). Tool contents are not included in those events.
- JSON Lines Viewer runs in your browser; extremely large inputs may be slow or limited by device memory.
- Results depend on your browser’s JavaScript engine and available APIs.
Frequently asked questions
What is JSON Lines or NDJSON?
Inspect JSON Lines files where each non-empty line contains one complete JSON value. Paste JSON Lines and run the viewer. Valid lines become a readable JSON array; invalid line numbers are reported.
Can I use this tool to inspect log exports?
Yes. This tool is designed for workflows such as inspect log exports, review ndjson data, check streaming api output.
Next steps after JSON Lines Viewer
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Open toolRelated guides
- Browse all JSON Utilities tools
- Explore the full UtilityKit catalogue
- Also explore Encoding & Decoding
- Also explore Security & Crypto
- Privacy: how local processing works
UtilityKit on utilitykit.store — Everything You Need. One Utility Kit.