Does Lines to JSON Array upload my file or text to Tool-You servers?

No. Lines to JSON Array runs in this browser tab. Files stay on the device. Limit note: Non-empty lines.

Should I use JSON Array to Lines instead of Lines to JSON Array?

Use Lines to JSON Array when you need Wrap lines as a JSON array. Use JSON Array to Lines when you need Expand a JSON string array to lines. They share a category (Convert) but not the same job.

Lines to JSON Array

Wrap lines as a JSON array.

Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.

What Lines to JSON Array does

Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.

Practical limit for Lines to JSON Array: Non-empty lines. That is why output can differ from heavy desktop Convert software. Read the tool-specific note again: Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.

How to use Lines to JSON Array

Keep this tab on Lines to JSON Array (/convert/lines-to-json-array). Pasting into the wrong Convert tool (for example JSON Array to Lines) changes the job.
Paste or type the input Lines to JSON Array expects. Path hint: convert · lines to json array. Wrap lines as a JSON array.
Apply the Lines to JSON Array action only. JSON to CSV is a different transform (Turn a JSON array of objects into CSV.). Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.
Copy the output of Lines to JSON Array if you need it elsewhere. Size/complexity still follows: Non-empty lines.
If the text job is actually Expand a JSON string array to lines., leave Lines to JSON Array and open JSON Array to Lines.

When not to use Lines to JSON Array

Skip Lines to JSON Array when a neighbor tool matches better — start with JSON Array to Lines or JSON to CSV — or when the description already warns the job will fail. In the tool’s own words: Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.

Questions about Lines to JSON Array

What does Lines to JSON Array do that other Convert pages on this site do not?: Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails. Short version: Wrap lines as a JSON array.
Does Lines to JSON Array upload my file or text to Tool-You servers?: No. Lines to JSON Array runs in this browser tab. Files stay on the device. Limit note: Non-empty lines.
Should I use JSON Array to Lines instead of Lines to JSON Array?: Use Lines to JSON Array when you need Wrap lines as a JSON array. Use JSON Array to Lines when you need Expand a JSON string array to lines. They share a category (Convert) but not the same job.
What are the limits of Lines to JSON Array?: Non-empty lines. Also: Turns each line into a JSON string array. Unlike JSON Array to Lines this encodes. Empty fails.