# Looking for a node +parser error **URL:** \ **Category:** XOD Programming Questions\ **Created:** [August 9, 2023, 9:16pm UTC](https://forum.xod.io/t/looking-for-a-node-parser-error/6619 "2023-08-09T21:16:23Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![bartex](https://avatars.discourse-cdn.com/v4/letter/b/848f3c/32.png) [@bartex](https://forum.xod.io/u/bartex)\ **Post date:** [August 9, 2023, 9:16pm UTC](https://forum.xod.io/t/looking-for-a-node-parser-error/6619/1 "2023-08-09T21:16:23Z")
Hello. I’m used to visual programming, but C++ is hard to me… XOD was the best _translation_ that I found. It was quite hard to start XOD, due to lack of basic _blocks_ (nodes), but I already figured it all out. Now I’m looking for a node, that basically does not exist and seem hard to implement to me… but looks easy to do in mind: I want to have something like self-expanding node. Sounds a bit like standard _variadic_, but it’s slightly different: what I want it to be, is that a number will tell the node how wide it should be (just like variadic, but going itself, depends on a given number). By that, a user may -for example- just write how many sides the figure would be, and then write them (like in the string) - the program will process it, and make some calculations depending on -for egz.- the count of sides, and decision which figure is that (triangle, square, etc). The problem would also be: how to make connections to all IN-pins, when extended… It may be also a kind of variadic, but made for not only inputs, but also outputs (like copying the code 1:1)… or a kind of a _copy-block_, which will copy its insides&pins for the given number of times. I don’t deny that I wanted to make a _storage-shelf_ in this way also (like: store data in gate-res; then choose the number of gate to send out data [by adding all outputs])… but it would need a variadic pin counter, whis is linked to each gate somehow. I already have a gate-res node (gate, but if False, it sends out 0), but I was stopped there. \*by the way: why variadic stops me from putting one bool+one number IN’s, and one number OUT…? I wanted to make a kind of variadic gate, but it didn’t agree… I saw some array libraries made by some of you, and it would be also good - but I wanted something self-expanding. Only string-data operations are possible…? * * * Like: I may create string-input, add couter of values into it, and then the program may begin working… **UPDATE:** Well, I tried. I copied the “constant-string” box from the Tutorial project, and made on this example a _saving_-part of the _magazine_, for exactly 4 elements: it takes number values, processes them (with added _counter_ - for the order), and _format-number_ node; all using concat - and so the _fake-json_ output was based on string - so it looks just like in the given example, but made for 4 numbers +1 word as a type option (I want to make 2 of them for 2 different things). Output from this _saving_-part is (4 egz.) this: **{“boki”: [42.27, 162.40, 184.20, 0]}**. It looks fine. Then, I made next code-node to unpack it [and here I have an official **Error**]: 1. _buffer_, to _freeze_ that string in time during _reading_ 2. _stream-string_, to make it in byte 3. _parse-json_, to make it readable within an order 4. _key_ to find if it’s my word 5. _nth_ and _number value_ to read those numbers. …and it all looks great; it even reads[**!**] _constant-string_ nodes filled with it (even my string), when pinned directly to _stream-string_, **BUT** … Part 3 - parser got errors each time I’m using additional 1 concat to add even 1 **right symbol** to the end of a string. I mean: even if I copy the original text **{“name”: “Peter”, “age”: 20, “pets”: [“turtle”, “snail”]** and add just one remaining **}** to the end with _concat_ - the parser immediately strikes with an error, stopping all next nodes from reading. I thought it may be because it’s somehow programmed to read constant strings, but… why it isn’t working when it gets a string that is constant during reading…? How to make it work, _finally_…? \*and I’m still thinking about that second _magazine_, with numbers that may be added without a limit… but I’m quite confused even here, so I stopped at this one. If someone knows how to solve it…? PS.: Thanks **A LOT** in advance!! ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/1X/eb7348baa04192c2ef932d1db54d44f09f8a7888.png) [@system](https://forum.xod.io/u/system)\ **Post date:** [September 8, 2023, 9:17pm UTC](https://forum.xod.io/t/looking-for-a-node-parser-error/6619/2 "2023-09-08T21:17:09Z")
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