Internal server error - Cannot read properties of undefined (reading 'length')

Queries and Resources
1

I'm attempting to make a POST request, but I keep encountering this error: 'Internal server error - Cannot read properties of undefined (reading 'length').' The request has a raw body with a couple of simple data points, nothing unusual. I've tried the same request in Postman, and it works fine there.

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Please help :worried:

2

Hi @Tabella,

It looks like the query is fine. I tested a similar query and it works. It maybe something to do with your response. Would you mind sharing a sample response from the end point?

3

Hi! Sure, thank you.

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I have double-checked the URL, the parameters, everything. However, I still receive that response from Retool, but the same request works fine in Postman.

4

Hmm those looks fine. If you click on the "API Request" tab on Retool UI (it's next to "Response"), what do you see? It'll also help to share a screenshot of that.

5

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{
"request": {
"url": "https://tabella-connection.herokuapp.com/api/v1/communities/relation",
"method": "POST",
"body": "{"id":"SaintPeter-Mertzon","parentId":"Diocese-4","childTypeName":"Parish"}",
"headers": {
"User-Agent": "Retool/2.0 (+https://docs.tryretool.com/docs/apis)",
"Authorization": "---sanitized---",
"ot-baggage-requestId": "undefined",
"x-datadog-trace-id": "8700139179157712507",
"x-datadog-parent-id": "8903674363730136149",
"x-datadog-sampling-priority": "-1",
"traceparent": "00-000000000000000078bd1a7cf6276e7b-7b9034a8fde30c55-00",
"tracestate": "dd=s:-1",
"X-Retool-Forwarded-For": "190.165.110.157"
}
},
"response": {
"data": {
"status": "error",
"message": "Internal server error - Cannot read properties of undefined (reading 'length')"
},
"headers": {
"server": [
"Cowboy"
],
"report-to": [
"{"group":"heroku-nel","max_age":3600,"endpoints":[{"url":"https://nel.heroku.com/reports?ts=1712760465&sid=1b10b0ff-8a76-4548-befa-353fc6c6c045&s=iItBliHYA7bKtOGflDzr5mBsqp33HGaQ7Uf%2FJ4eyk0s%3D\"}]}"
],
"reporting-endpoints": [
"heroku-nel=https://nel.heroku.com/reports?ts=1712760465&sid=1b10b0ff-8a76-4548-befa-353fc6c6c045&s=iItBliHYA7bKtOGflDzr5mBsqp33HGaQ7Uf%2FJ4eyk0s%3D"
],
"nel": [
"{"report_to":"heroku-nel","max_age":3600,"success_fraction":0.005,"failure_fraction":0.05,"response_headers":["Via"]}"
],
"connection": [
"keep-alive"
],
"x-powered-by": [
"Express"
],
"access-control-allow-origin": [
"*"
],
"content-type": [
"application/json; charset=utf-8"
],
"content-length": [
"109"
],
"etag": [
"W/"6d-icu2kgFMdCSZdKRrdmWTkDVX9DM""
],
"date": [
"Wed, 10 Apr 2024 14:47:45 GMT"
],
"via": [
"1.1 vegur"
]
},
"status": 500,
"statusText": "Internal Server Error"
}
}

6

@Tabella It looks like the error comes from your server (status: 500 in the metadata). The body looks as expected. The request we send looks normal as well. I suspect it can be some default headers we have is missing or not as expected. Like I don't see "application/json" type in the body.

  • Can you change the body format from "RAW" to "JSON"?
  • Can you check your server on heroku to see if there is any crash log related to the error Cannot read properties of undefined (reading 'length')"?
7

Changing from RAW to JSON worked!!! Thank you soooooo much!!!!