JSON Tools
JSON Line Numbers Viewer
View JSON with synchronized line numbers for debugging.
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What is JSON Line Numbers?
The JSON Line Numbers Viewer is a minimal, fast JSON reader that displays line numbers alongside your data — useful for debugging large JSON files and pinpointing errors.
How it works
The tool renders a textarea with a synchronized gutter showing line numbers. Paste or drop a JSON file and scroll to inspect with numbered lines.
- Paste JSON. Paste or drop your JSON.
- Scroll and inspect. Line numbers stay in sync as you scroll.
Examples
Debug an error at line 42
Paste your JSON, scroll to line 42, and see exactly what's there.
Alternatives
IDE line numbers
VS Code and other editors show line numbers natively.
Frequently asked questions
Does it validate JSON?
No — this is purely a viewer. Use the JSON Validator for syntax checking.