# API Rest and JSon **URL:** \ **Category:** General\ **Created:** [September 14, 2026, 1:37pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881 "2026-09-14T13:37:45Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Nedi\_Freguglia](https://forum.xojo.com/user_avatar/forum.xojo.com/nedi_freguglia/32/337_2.png) [@Nedi\_Freguglia](https://forum.xojo.com/u/Nedi_Freguglia)\ **Post date:** [September 14, 2026, 1:37pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/1 "2026-09-14T13:37:46Z")
Hi everyone, I need your help preparing to send invoices (headers and lines) via a REST API. I need to construct a request body containing an array of headers (even if it consists of just a single element); each header is made up of a set of properties and an array of lines. Since I don’t have much experience with JSON, I’m struggling to put this together. Can anyone help me? Thanks!! Nedi ---
**Author:** ![Anthony\_G\_Cyphers](https://forum.xojo.com/user_avatar/forum.xojo.com/anthony_g_cyphers/32/16862_2.png) [@Anthony\_G\_Cyphers](https://forum.xojo.com/u/Anthony_G_Cyphers)\ **Post date:** [September 14, 2026, 4:01pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/2 "2026-09-14T16:01:23Z")
What have you tried? What issue(s) are you seeing? What’s the REST API look like (documentation)? Have you taken a look at the REST API example included with Xojo? ---
**Author:** ![MarkusR](https://forum.xojo.com/user_avatar/forum.xojo.com/markusr/32/685_2.png) [@MarkusR](https://forum.xojo.com/u/MarkusR)\ **Post date:** [September 14, 2026, 4:35pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/3 "2026-09-14T16:35:36Z")
desktop app? have a look at class URLConnection (there are fragments for send JSON too) > **[URLConnection — Xojo documentation](https://documentation.xojo.com/api/networking/urlconnection.html)** the http header becomes `Content-Type: application/json; charset=utf-8` and the count of bytes of the body `Content-Length: 1234` the end of a raw header are 2x CRLF followed by body data. the json object is send as `.ToString` in the request body > **[JSONItem — Xojo documentation](https://documentation.xojo.com/api/text/json/jsonitem.html#jsonitem)** > > Class ---
**Author:** ![Nedi\_Freguglia](https://forum.xojo.com/user_avatar/forum.xojo.com/nedi_freguglia/32/337_2.png) [@Nedi\_Freguglia](https://forum.xojo.com/u/Nedi_Freguglia)\ **Post date:** [September 14, 2026, 6:01pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/4 "2026-09-14T18:01:18Z")
Thank you, guys! I had to create a body with this structure: Document array of Document\_Header value 1 value 2 value 3 … array of Document\_Line value 1 value 2 value 3 … I don’t know how to manage the various JSonitem to do that. ---
**Author:** ![Thom\_McGrath](https://forum.xojo.com/user_avatar/forum.xojo.com/thom_mcgrath/32/192_2.png) [@Thom\_McGrath](https://forum.xojo.com/u/Thom_McGrath)\ **Post date:** [September 14, 2026, 6:44pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/5 "2026-09-14T18:44:17Z")
It works a lot like Dictionary, but can act like an array too. I might do something like: ```json Var Headers As New JSONItem("[]") Headers.Add("value 1") Headers.Add("value 2") Headers.Add("value 3") Var Lines As New JSONItem("[]") Lines.Add("value 1") Lines.Add("value 2") Lines.Add("value 3") Var Document As New JSONItem("{}") Document.Value("Document_Header") = Headers Document.Value("Document_Line") = Line ``` Two things to note here: 1. This is probably not correct for your implementation, but I’m working with the information I have. 2. Passing `"[]"` and `"{}"` is absolutely not necessary. I like to do it as a hint to my future self that the item should be an array vs a structure. It also prevents you from accidentally switching the JSONItem to the other mode before any content is added. ---
**Author:** ![Nedi\_Freguglia](https://forum.xojo.com/user_avatar/forum.xojo.com/nedi_freguglia/32/337_2.png) [@Nedi\_Freguglia](https://forum.xojo.com/u/Nedi_Freguglia)\ **Post date:** [September 15, 2026, 6:49am UTC](https://forum.xojo.com/t/api-rest-and-json/88881/6 "2026-09-15T06:49:25Z")
Thank you, Tom. The correct structure of the body must be like this: { “DocumentiT”: [ { “key\_documento”: “…”, “num\_anno”: …, “des\_num\_doc”: “…”, “DocumentiR”: [ { “key\_documento”: “…”, “prg\_riga”: …, “ind\_tiporiga”: “A” } ] } ] } The problem is that I don’t know how to obtain it! ---
**Author:** ![Thom\_McGrath](https://forum.xojo.com/user_avatar/forum.xojo.com/thom_mcgrath/32/192_2.png) [@Thom\_McGrath](https://forum.xojo.com/u/Thom_McGrath)\ **Post date:** [September 15, 2026, 7:01pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/7 "2026-09-15T19:01:17Z")
Here’s the “pretty” version, for anybody else reading: ```json { "DocumentiT": [ { "key_documento": "…", "num_anno": "…", "des_num_doc": "…", "DocumentiR": [ { "key_documento": "…", "prg_riga": "…", "ind_tiporiga": "A" } ] } ] } ``` I’ve given you the basic premise. You’re going to need to create a JSONItem struct with the keys `key_documento`, `prg_riga`, and `ind_tiporiga`. You then add that to a JSONItem array, and add _that_ array as the value for a `DocumentiR` key in a different struct. And so on. There’s definitely some nesting to do. If you mean you don’t know how to get the JSON string to send over the socket, a quick look at the documentation would point you to the `ToString` method. Its default parameters will serve just fine for a REST API. ---
**Author:** ![MarkusR](https://forum.xojo.com/user_avatar/forum.xojo.com/markusr/32/685_2.png) [@MarkusR](https://forum.xojo.com/u/MarkusR)\ **Post date:** [September 15, 2026, 8:15pm UTC](https://forum.xojo.com/t/api-rest-and-json/88881/8 "2026-09-15T20:15:35Z")
> JSONItem to understand jsonitem create one and set a break point to see content in debug window. explained json > **[JSON](https://www.json.org/json-en.html)** ---
**Author:** ![Gabriel\_Ludosanu](https://forum.xojo.com/user_avatar/forum.xojo.com/gabriel_ludosanu/32/20665_2.png) [@Gabriel\_Ludosanu](https://forum.xojo.com/u/Gabriel_Ludosanu)\ **Post date:** [September 17, 2026, 9:22am UTC](https://forum.xojo.com/t/api-rest-and-json/88881/9 "2026-09-17T09:22:15Z")
[Search Results for “json” – Xojo Programming Blog](https://blog.xojo.com/?s=json) 🙂 ---
**Author:** ![Nedi\_Freguglia](https://forum.xojo.com/user_avatar/forum.xojo.com/nedi_freguglia/32/337_2.png) [@Nedi\_Freguglia](https://forum.xojo.com/u/Nedi_Freguglia)\ **Post date:** [September 18, 2026, 7:19am UTC](https://forum.xojo.com/t/api-rest-and-json/88881/10 "2026-09-18T07:19:08Z")
Thank you all, guys!