Passing only certain values from a payload?

Developing Nodes
1

Alright guys, I feel like a knucklehead. Node-red has been running beautifully for awhile and I haven't needed to change anything. Now I need to extrapolate some data from an object and only pass those values. I thought I did it before with a Function Node, but I can't seem to get anything to work. This is the incoming data.

{"data":{"common":{"productId":{"wwwItemId":"276","upca":"630","productId":"7A9H","offerId":"EE212DDAE","ean13":"060312"},"name":"Litvst","department":"","thumbnailImageUrl":"","productImageUrl":"https://","customerRating":{"rating":4.1,"count":152},"productUrl":"https://","variantSwatches":[],"offerType":"ONLINE_AND_STORE","twoDayShippingEligible":false,"storePickupAvailable":false,"storePickupAvailableToday":false,"nextDayShippingEligible":false},"inStore":{"price":{"priceInCents":1000,"currencyUnit":"USD"},"location":{"aisles":["N9"],"detailedAisles":[{"zoneName":"N","aisleName":9,"sectionName":2}]},"storeId":XXXX},"online":{"price":{"priceInCents":2499,"currencyUnit":"USD","showInCart":false},"inventory":{"status":"In Stock","available":true},"specialOfferBadge":"rollback","specialOfferText":"Rollback"},"relatedItemsUrls":{"inStore":"https://","online":"https"}}

The values from the msg.payload is msg.payload.data.common.name, msg.payload.data.inStore.price.priceInCents, payload.data.inStore.storeId, etc.

I have a change node and function node which will extract msg.payload.data.common.name, but it becomes it's own separate message. I'd basically like to remove all the useless info from the payload. I just can't remember how.

[{"id":"822d599.c1c9ca8","type":"change","z":"c3e84d4e.4ead68","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload.data.common.name","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":820,"y":2160,"wires":[["1cb49f4.fe872e1","d847038d.95dde"]]},{"id":"1cb49f4.fe872e1","type":"function","z":"c3e84d4e.4ead68","name":"","func":"msg.payload = `Name:${msg.payload}`;\nreturn msg;","outputs":1,"noerr":0,"x":1130,"y":2160,"wires":[["3a4f0c57.7d8c74","a26ef6e1.a115d8"]]}]
2

There are many ways to skin a cat
e.g.

[{"id":"febf56d.68015a8","type":"inject","z":"6fcc3140.459a2","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"data\":{\"common\":{\"productId\":{\"wwwItemId\":\"276\",\"upca\":\"630\",\"productId\":\"7A9H\",\"offerId\":\"EE212DDAE\",\"ean13\":\"060312\"},\"name\":\"Litvst\",\"department\":\"\",\"thumbnailImageUrl\":\"\",\"productImageUrl\":\"https://\",\"customerRating\":{\"rating\":4.1,\"count\":152},\"productUrl\":\"https://\",\"variantSwatches\":[],\"offerType\":\"ONLINE_AND_STORE\",\"twoDayShippingEligible\":false,\"storePickupAvailable\":false,\"storePickupAvailableToday\":false,\"nextDayShippingEligible\":false},\"inStore\":{\"price\":{\"priceInCents\":1000,\"currencyUnit\":\"USD\"},\"location\":{\"aisles\":[\"N9\"],\"detailedAisles\":[{\"zoneName\":\"N\",\"aisleName\":9,\"sectionName\":2}]},\"storeId\":1111},\"online\":{\"price\":{\"priceInCents\":2499,\"currencyUnit\":\"USD\",\"showInCart\":false},\"inventory\":{\"status\":\"In Stock\",\"available\":true},\"specialOfferBadge\":\"rollback\",\"specialOfferText\":\"Rollback\"},\"relatedItemsUrls\":{\"inStore\":\"https://\",\"online\":\"https\"}}}","payloadType":"json","x":220,"y":840,"wires":[["394060bf.ee1b3","97de1444.6039"]]},{"id":"394060bf.ee1b3","type":"change","z":"6fcc3140.459a2","name":"","rules":[{"t":"set","p":"hold","pt":"msg","to":"payload","tot":"msg"},{"t":"set","p":"payload","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"payload.data.common.name","pt":"msg","to":"hold.data.common.name","tot":"msg"},{"t":"set","p":"payload.data.inStore.price.priceInCents","pt":"msg","to":"hold.data.inStore.price.priceInCents","tot":"msg"},{"t":"set","p":"payload.data.inStore.storeId","pt":"msg","to":"hold.data.inStore.storeId","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":420,"y":860,"wires":[["c7c1897c.129798"]]},{"id":"97de1444.6039","type":"debug","z":"6fcc3140.459a2","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":590,"y":660,"wires":[]}]
3

This certainly works! But I fail to understand why.

4

first it copies payload to hold
then it clears payload.
then it moves items from hold back to payload.

5

That's awesome! I had no idea you could do that.

Is there a way to make it spit out

name : TheNameOfSomething
price : priceInCents1000
storeId : XXX

6

That's Node-red's excellent low code interface. Respect Dev's

7

i would think so.
where are

name : TheNameOfSomething
price : priceInCents1000
storeId : XXX

located in your object?

And is that the string format or an object?

8

So if I use your example, I get

payload.data.common.name
payload.data.inStore.price.priceInCents
payload.data.inStore.storeId

in the debug node. I'm just curious if there's a way to make it look more clean (it'll be going into a spreadsheet hopefully.)

{{name : payload.data.common.name, price : payload.data.inStore.price.priceInCents, store : payload.data.inStore.storeId}}

(I have no idea what I'm doing. I can't remember how it worked.)

9

try

[{"id":"75500b3f.812ff4","type":"change","z":"8d22ae29.7df6d","name":"","rules":[{"t":"set","p":"hold","pt":"msg","to":"payload","tot":"msg"},{"t":"set","p":"payload","pt":"msg","to":"{}","tot":"json"},{"t":"set","p":"payload.name","pt":"msg","to":"hold.data.common.name","tot":"msg"},{"t":"set","p":"payload.price","pt":"msg","to":"{'priceInCents': hold.data.inStore.price.priceInCents} ","tot":"jsonata"},{"t":"set","p":"payload.storeId","pt":"msg","to":"hold.data.inStore.storeId","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":470,"y":780,"wires":[["ca18810d.3ed83"]]}]
10

So close! The {'priceInCents': hold.data.inStore.price.priceInCents} comes up as it's own object and then you have to drill down to get the price.

In the debug node it shows {"name":"Litvst","price":OBJECT,"storeId":1111}

11

I did ask about your format, but you never answered. so from above i took the different colour of the 1000 as it was an object. How exactly do you wish the value in price to look?

12

Oh sorry about that, I must have missed it. I'm curling json data from a website. The 1000 is a variable that changes based on what I'm curling. So, I'm really not sure what it is. Thank you for your help. I'm terrible with node-red (javascript, variables, programming, function nodes, etc etc etc)

13

You never answer the question, I want the exact format you require. In future when asking for help it is best to give clear examples of input (your original json has an error , created by you when you edited in XXXX. a string with out quotes), and output, with clear examples, so people only have to do thing once. This is the third attempt, lets get it right this time.

14

I guess I'm trying to take

{"data":{"common":{"productId":{"wwwItemId":"276","upca":"630","productId":"7A9H","offerId":"EE212DDAE","ean13":"060312"},"name":"Litvst","department":"","thumbnailImageUrl":"","productImageUrl":"https://","customerRating":{"rating":4.1,"count":152},"productUrl":"https://","variantSwatches":[],"offerType":"ONLINE_AND_STORE","twoDayShippingEligible":false,"storePickupAvailable":false,"storePickupAvailableToday":false,"nextDayShippingEligible":false},"inStore":{"price":{"priceInCents":1099,"currencyUnit":"USD"},"location":{"aisles":["N9"],"detailedAisles":[{"zoneName":"N","aisleName":9,"sectionName":2}]},"storeId":2231},"online":{"price":{"priceInCents":2499,"currencyUnit":"USD","showInCart":false},"inventory":{"status":"In Stock","available":true},"specialOfferBadge":"rollback","specialOfferText":"Rollback"},"relatedItemsUrls":{"inStore":"https://","online":"https"}}

and have it display

"name":"Litvst"
"priceInCents":1099
"storeId":2231

Thats from the JSON I pulled. Those are the only values I need to extract from that long JSON. If it's an object, or string, or buffer, I really have no idea. All I know is the "Name" "priceInCents" and "storeId" values change depending what is being pulled.

I could curl another JSON and it coulf turn into

"name":"Tacos"
"priceInCents":100
"storeId":2771

15

ok let's hope.

[{"id":"75500b3f.812ff4","type":"change","z":"8d22ae29.7df6d","name":"","rules":[{"t":"set","p":"hold","pt":"msg","to":"payload","tot":"msg"},{"t":"set","p":"payload","pt":"msg","to":"{}","tot":"msg"},{"t":"set","p":"payload.name","pt":"msg","to":"hold.data.common.name","tot":"msg"},{"t":"set","p":"payload.priceInCents","pt":"msg","to":"hold.data.inStore.price.priceInCents","tot":"msg"},{"t":"set","p":"payload.storeId","pt":"msg","to":"hold.data.inStore.storeId","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":470,"y":780,"wires":[["ca18810d.3ed83"]]}]
16

WOOHOO!! It worked!! Thank you so much!

17

just edited it to remove data property take another look at above post

18

Perfect!!!!

19

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