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

No. JSON Array Join runs in this browser tab. Files stay on the device. Limit note: JSON array + separator.

Should I use Split to JSON Array instead of JSON Array Join?

Use JSON Array Join when you need Join a JSON array with a separator. Use Split to JSON Array when you need Split text into a JSON array. They share a category (Convert) but not the same job.

JSON Array Join

Join a JSON array with a separator.

Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails.

What JSON Array Join does

Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails.

The interactive controls for JSON Array Join load after this article so crawlers still read the instructions. Path /convert/json-array-join is the canonical address. Work happens on this device; Tool-You does not take a copy of the file or pasted text for JSON Array Join.

How to use JSON Array Join

Keep this tab on JSON Array Join (/convert/json-array-join). Pasting into the wrong Convert tool (for example Split to JSON Array) changes the job.
Paste or type the input JSON Array Join expects. Path hint: convert · json array join. Join a JSON array with a separator.
Apply the JSON Array Join action only. JSON Array to Lines is a different transform (Expand a JSON string array to lines.). Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails.
Copy the output of JSON Array Join if you need it elsewhere. Size/complexity still follows: JSON array + separator.
If the text job is actually Split text into a JSON array., leave JSON Array Join and open Split to JSON Array.

When not to use JSON Array Join

Skip JSON Array Join when a neighbor tool matches better — start with Split to JSON Array or JSON Array to Lines — or when the description already warns the job will fail. In the tool’s own words: Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails.

Questions about JSON Array Join

What does JSON Array Join do that other Convert pages on this site do not?: Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails. Short version: Join a JSON array with a separator.
Does JSON Array Join upload my file or text to Tool-You servers?: No. JSON Array Join runs in this browser tab. Files stay on the device. Limit note: JSON array + separator.
Should I use Split to JSON Array instead of JSON Array Join?: Use JSON Array Join when you need Join a JSON array with a separator. Use Split to JSON Array when you need Split text into a JSON array. They share a category (Convert) but not the same job.
What are the limits of JSON Array Join?: JSON array + separator. Also: Joins stringified items with a separator. Unlike Split to JSON Array this joins. Non-array fails.