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Bulk set custom fields value via Trello rest API

I have a use case where I need to set about 20 custom fields when creating trello cards via REST API. I checked the API docs but there is no mention of setting custom fields in bulk. I dont want to set value of fields one by one.
I know that setting values in bulk is possible because this is implemented in create card action of zapier app -

Please advise me how to do it.

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Iain Dooley Community Leader Feb 04, 2021

@Anand Kashyap there is no way to do it in bulk, the Zapier action is probably just looping through and doing it one by one.

thats strange - this way the trello API limit would be exhausted pretty fast

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Iain Dooley Community Leader Feb 04, 2021

@Anand Kashyap the api limits in Trello are all rate limits, as such it might take time but as long as you space out your api calls it will still finish. The thing that has limits on number of command runs is Butler.

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should I send parallel requests for setting values or sequential so that rate limits are kept under control? and if sequential what could be a safe time gap between two requests?

Hello Anand.

It doesn't matter if you send the requests in parallel or sequentially, they both 'add up' to the rate total. The rate limit is very generous and unless you are editing thousands of custom fields per session, you'll be fine. Just iterate through the 20 custom fields per card.

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