crypto_vba VS VBA-JSON

It basically uses the Dictionary object to create variables (e.g. with a dictionary in a dictionary) and after that using that library to transform it into a string. I'm using it in my project here: https://github.com/krijnsent/crypto_vba/blob/master/ModExchKucoin.bas

I agree with u/sslinky84 that there is no safe place in VBA. The main question is: what's the purpose of an API key in this case? From your description you are not linking an API-key to a single user, but have "one key to rule them all". So you probably want to prevent someone from grabbing your end-point and spamming it? In that case you're perfectly fine in creating one API-string in VBA and checking that on the server: it blocks the person who is opening a browser to fiddle with your end-point, but it does give you some security. The people who can get through are the ones that manage to crack open your VBA (assuming you have a password on the VBA). To make their life a bit harder you could instead of a "fixed string" as API key go for some kind of hash, as u/archn suggests. E.g.: take the rest of the post message that e.g. also includes a mandatory timestamp, make a simple hash of that (might even include a "fixed key", see e.g. https://github.com/krijnsent/crypto_vba/blob/master/ModHash.bas for some code).

I've built an open source VBA-Excel library to communicate with cryptocurrency exchanges ( https://github.com/krijnsent/crypto_vba ) and have my code available as .bas and in an .xlsm file. A couple of days ago someone posted an issue that my xlsm file triggered a Windows defender alert. At my pc this doesn't happen, the AVG virus scanner also won't show anything.

I am mainly using Cryptocompare, but if you want to use CoinGecko, check out my code, it has the basics: https://github.com/krijnsent/crypto_vba/ It has most of the essentials: connecting Excel to web, handling Json and some API examples.

Have you tried the VBA-JSON library? That includes a method that will format your JSON files with indenting, etc. As for styling the output, that again can be done with VBA. I did something just like this a few years ago, I can look for the code if you're interested.

I've used this https://github.com/VBA-tools/VBA-JSON in the past with VBA which may work for your case and it had issues if it was very complicated json but for things like web services worked fine for me

I've done something similar using a HTTP request and a JSON converter module.

If you're comfortable with VBA, you might want to check out VBA-JSON.

The terms you could search for are "VBA" & "JSON" ;-). My first hit is: https://github.com/VBA-tools/VBA-JSON -> that has even an example (scroll down) of a 2 level JSON.

Here's the great JsonConverter module for parsing JSON data into data structures. The hardest part about using this, is figuring out how to access your data once you've passed the JSON data to the module. Depending on the complexity of the JSON data, it can be pretty unintuitive in how to export or access the parsed data.

jsonConverter : VBA-tools/VBA-JSON: JSON conversion and parsing for VBA (github.com)

Below VBA should help. You need to add a reference to the MS Scripting Runtime in VBE > Tools > References. You also need to import the JSON Converter module by Tim Hall.