Nested json path using variables in Postman Flow

Question

I have a scenario where I have some JSON ("lldp" in the image below), and I need to find a particular key and pull all of its values from within. The particular key I need to pull is dynamic and is identified as the 'thisPort' variable. All of this is shown in the screenshot below.

The lldp data basically looks like this. Note how the ports are not within a list. Any given instance of the lldp data may contain anywhere between 1 - 48 ports.

lldp = {
   "port1": {"stuff":"things"},
   "port2": {"stuff":"things"},
   "port40": {"stuff":"things"}
}

I assumed I could do something like "lldp.thisPort" to access the keys and variables withing, however this produces useless errors and doesn't work. In this case I passed it three different 'thisPort' variables from a list, so presumably its the same problem three times, and not three different problems.

'thisPort' does correctly come across to the Evaluate function as a string that should lead to a valid JSON path. Eg, 'lldp.thisPort' does seem to translate to a valid path like 'lldp.port1', but Evaluate doesn't seem to agree and I get an error.

Using variables (or any other 'dynamic' way of working), how can you access the keys/values within some JSON as part of a postman flow, when the path to the thing you're trying to pull is dynamic?

You had better put this question to github. I don't see a way to resolve this var `thisPort` at runtime in Evaluate block. — lucas-nguyen-17, Feb 08 '23 at 08:49

score 0 · Answer 1 · answered Feb 15 '23 at 12:51

0

You can use $lookup(lldp, thisPort) inside the Evaluate block to get the values inside the thisPort object.

answered Feb 15 '23 at 12:51

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Nested json path using variables in Postman Flow

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