Paste the following text into an empty JSON document and see if the matching of the curly and square brackets works as expected. It doesn't for me.
{
\"ID\": 256,
\"Things\": [
{
\"Thing\": 1,
\"Group\": {
\"What\": \"AllOf\",
\"Who\":
[\"ÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗ\",
\"ÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗ\",
\"ÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗ\",
\"ÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗÐБВГДЕЖЗ\"]
}
}]
}]
Build Date: December 16, 2020 (State file: February 9, 2021)
Emulation: CUA
OS: Linux
OS Version: S
Kernel Level: 3.10.0-1160.21.1.el7.x86_64
Build Version: #1 SMP Tue Mar 16 18:28:22 UTC 2021
Processor Architecture: x86_64