List to JSON Array Converter
Turn a plain list, one item per line, into a JSON array in a single click. This is the fastest way to move a column you copied from a spreadsheet, a text file or a chat message into code as a proper array. Each non empty line becomes one array element, surrounding whitespace is trimmed, and you can choose to keep every value as a string or auto detect numbers and booleans so that clean numeric lists become real numbers. Optional deduplication removes repeated lines while preserving the first occurrence order, which is handy for building lookup lists. Blank lines are ignored so stray newlines do not create empty entries. Paste your list, pick your options, click convert, and copy the array. Everything runs locally in your browser, so nothing you paste is sent to a server.
How to use List to JSON Array
- Paste a list, one item per line.
- Choose string or number output and dedup if wanted.
- Copy the JSON array.
Frequently asked questions
How are lines turned into array items?
Each line of your input becomes one element in the JSON array, either as a string or as a number when the line is numeric.
Does it clean up the input?
Yes. It trims blank lines and can optionally remove duplicate entries so the array is tidy.
Can it make an array of numbers?
Yes. When lines are numeric it can emit them as JSON numbers rather than quoted strings.
What is List to JSON Array?
Turn a plain list, one item per line, into a JSON array in a single click. This is the fastest way to move a column you copied from a spreadsheet, a text file or a chat message into code as a proper array.
Is List to JSON Array free to use?
Yes. List to JSON Array is completely free, with no sign-up and no usage limits.
Does List to JSON Array work in a web browser?
Yes. List to JSON Array runs in any modern web browser. There is nothing to download or install.
Is my data private with List to JSON Array?
Yes. List to JSON Array runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/list-to-json-array)