List to JSON

Plain text lists are everywhere — column exports, note files, ticket payloads, pasted terminal output. When the data has to leave the text world and enter a JSON pipeline, every line needs quoting, escaping and typing by hand. For hundreds of lines that is exactly the kind of work that introduces errors.

Convert a List to JSON turns each line of a text list into an array element in one click. Optional key:value detection produces objects, auto-typing turns numbers and booleans into native values, and trimming and blank-line options keep the output clean.

• Line to element: Every line of input becomes one JSON array element.
• Object mode: key: value or key=value lines become a JSON object.
• Auto-detection: Choose array or object output automatically from the content.
• Auto-typing: Numbers, true, false and null become native JSON values.
• CSV splitting: Split comma-separated lines into arrays of values when enabled.
• Cleaning options: Trim whitespace and skip empty lines.
• Pretty output: The result is formatted, readable JSON.
• Private: All processing happens in your browser; nothing is uploaded.

1. Paste your list — one item per line.
2. Pick the output shape: array, object from key: value, or auto-detect.
3. Toggle auto-typing if numbers and booleans should stay native.
4. Trim and skip-empty for clean output.
5. Copy or download the resulting JSON.

Example 1 — Email list. A team pastes a column of addresses from a spreadsheet into the tool and gets a JSON array of strings, ready for an API payload.

Example 2 — Config pairs. A developer converts a list of host=value lines into a JSON object with auto-typing, so port=5432 becomes a number without manual editing.

Example 3 — CSV column. An analyst enables the split option on comma-separated lines to produce an array of arrays, then feeds it to a charting script.

Example 4 — Test data. A QA engineer pastes a list of usernames and generates JSON test fixtures in seconds, with empty lines and stray whitespace cleaned automatically.

• Bulk conversion: Hundreds of lines become JSON in one click.
• Shape control: Array or object output with auto-detection.
• Typed values: Numbers and booleans stay native when you want them to.
• Clean input handling: Trimming and blank-line skipping built in.
• Zero data movement: The list is converted locally and never uploaded.