As mentioned at the new issue, this repository doesn't include Windows PowerShell (5.1). Fyi: there are a lot of similar issues as this one covered at StackOverflow, see e.g.: https://stackoverflow.com/questions/24745868/powershell-passing-json-string-to-curl.
I recommend you check them first and if your question isn't covered there, post your own.

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Powershell: passing json string to curl

I'm trying to pass a JSON string from within a powershell script to the build.phonegap.com api, using curl. According to phonegap's forum, when running on a Windows machine, the JSON data has to be

Below are the test i did with my powershell version 5.1. But all suggested solutions are not working as expected. Trying use the a string('hello') inside the body of the json in SELECT statement but the powershell is not considering as string. @iRon7 Need your thoughts or assistance on this issue.

test 1:
curl.exe -k -v -w "%{http_code}" -X POST "localhost:18093/query/service" -u username:password -H "Content-Type: application/json" -d ' { \"statement\":\"SELECT 'hello'\" } '

Error:
curl: (3) URL rejected: Malformed input to a URL function
curl: (3) unmatched close brace/bracket in URL position 1:
}
^
httpCode: { "requestID": "a1006669-49b2-434f-a9b6-451345aef482", "errors": [{"code":1040,"msg":"Error processing getting value - cause: unexpected end of JSON input"}], "status": "fatal", "metrics": {"elapsedTime": "119.601┬╡s","executionTime": "59.501┬╡s","resultCount": 0,"resultSize": 0,"serviceLoad": 0,"errorCount": 1} } 400000

test 2:
Curl command: curl.exe --% -k -v -w "%{http_code}" -X POST "localhost:18093/query/service" -u username:password -H "Content-Type: application/json" -d ' { \"statement\":\"SELECT 'hello'\"} '

Invoke-Expression : At line:2 char:45
"statement":"SELECT 'hello'"} '
~
Unexpected token '}' in expression or statement.
At line:2 char:47
"statement":"SELECT 'hello'"} '
~
The string is missing the terminator: '.
At C:\Users\sramach2\create_prepareds_new.ps1:66 char:19
$httpCode = Invoke-Expression $cmd
~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : ParserError: (:) [Invoke-Expression], ParseException
FullyQualifiedErrorId : UnexpectedToken,Microsoft.PowerShell.Commands.InvokeExpressionCommand

test 3:
Curl command: curl.exe --% -k -v -w "%{http_code}" -X POST "localhost:18093/query/service" -u username:password -H "Content-Type: application/json" -d ' { \"statement\":\"SELECT \'hello\'\"} '

Invoke-Expression : At line:2 char:47
"statement":"SELECT 'hello'"} '
~
Unexpected token '}' in expression or statement.
At line:2 char:49
"statement":"SELECT 'hello'"} '
~
The string is missing the terminator: '.
At C:\Users\sramach2\create_prepareds_new.ps1:66 char:19
$httpCode = Invoke-Expression $cmd
~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : ParserError: (:) [Invoke-Expression], ParseException
FullyQualifiedErrorId : UnexpectedToken,Microsoft.PowerShell.Commands.InvokeExpressionCommand

test 4:

cmd /c @' curl.exe -k -v -w -u ${username}:${password} -X POST "$url" -d '{"statement":"SELECT '\''hello'\''"} -H "Content-Type: application/json" '@

curl: (3) URL rejected: Bad hostname
-uCurl command: { "requestID": "cfeb75cb-4d42-432a-a2cc-d26e2043cd0e", "errors": [{"code":1040,"msg":"Error processing getting key - cause: invalid character '\\' looking for beginning of object key string"}], "status": "fatal", "metrics": {"elapsedTime": "92.301┬╡s","executionTime": "34.4┬╡s","resultCount": 0,"resultSize": 0,"serviceLoad": 0,"errorCount": 1} }
Invoke-Expression : Cannot convert 'System.Object[]' to the type 'System.String' required by parameter 'Command'. Specified method is not supported.
At C:\Users\sramach2\create_prepareds_new.ps1:66 char:37
$httpCode = Invoke-Expression $cmd
~~~~

As suggested before: please move your question with details to: https://stackoverflow.com/questions/ask
This repository does not cover Windows PowerShell (5.1).

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Just a quick pointer: ' { \"statement\":\"SELECT 'hello'\" } ' is syntactically broken: you must double ' instances in order to embed them in a '...' string; thus: ' { \"statement\":\"SELECT ''hello''\" } '

@mklement0 still getting error for below command which you suggested.

Curl command: curl.exe --% -k -v -w "%{http_code}" -X POST "https://localhost:18093/query/service" -u username:password -H "Content-Type: application/json" -d '{\"statement\":\"SELECT ''hello''\"}'

Error:

• schannel: SSL/TLS connection renegotiated
  < HTTP/1.1 400 Bad Request
  < Content-Length: 316
  < Content-Type: application/json; version=7.6.6-N1QL
  < Date: Fri, 05 Sep 2025 17:23:17 GMT
  <
  {
  "requestID": "83eff572-ed8c-4719-841a-ef48068b1667",
  "errors": [{"code":1040,"msg":"Error processing getting value - cause: unexpected end of JSON input"}],
  "status": "fatal",
  "metrics": {"elapsedTime": "142.102µs","executionTime": "80.601µs","resultCount": 0,"resultSize": 0,"serviceLoad": 0,"errorCount": 1}
  }
• Connection to host localhost left intact
  -ucurl: (3) unmatched close brace/bracket in URL position 9:
  'hello'"}
  ^

You need at least one space before the first \" (which my previous recommendation had in the form of leading spaces, based on your own original argument); e.g.:

... -d '{ \"statement\": \"SELECT ''hello''\" }'

Again, please note that this is not the place for PowerShell 5.1 questions.

Glad to hear it's resolved, @rsarvan88; my pleasure.