Postman Thingspeak Error 400 & Thinkspeak not updating the data

Hi, I am trying to do the bulk update and using the following URL.

https://api.thingspeak.com/channels/channel_id/bulk_update.json

I send the following data

{
    "write_api_key": "key",
    "updates": [
        {
            "delta_t": 0,
            "wavelengths": 5,
            "amplitude": 10
        }
    ]
}

When i write just once the data is written and i get the entry number in reply. Thingspeak still does not show the data. Although it shows that the no of entries have been updated.

https://api.thingspeak.com/update?api_key=key&wavelengths=30&amplitude=50

[Vinod]

Your field names must be field1, field2 ,field3, field4, field5, filed6, field7 or field8. You can label them as you wish in the field name setting on the channel's settings page.

At the current time you can not use arbitrary names such as "wavelengths" and "amplitude" in the API request.

[Syed Shah]

Hi, Thank you for your reply.

Answer 1

[Christopher Stapels]

The bulk write API can be kind of tricky when it comes to syntax.

Follow the bulk write doc suggestions closely. There is a POSTMAN example there, look in the examples section.

For example, you cannot use your field names to update, you need to use field1 and field2 etc. That is also true for writing data at the regular update endpoint.

https://api.thingspeak.com/update?api_key=key&field1=30&field2=50

[Syed Shah]

Hi, Thank you. The docs dont say specifically to use the fields. Using fields1,2 works.

[Christopher Stapels]

We will consider adding a note to the doc page. I appreciate your feedback.