Need Help, i am stuck at https

Help me Build my Workflow
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1

hey i am working on template in which i got stuck in https node where i couldng process it and move further i tried chatgpt and all other ai stuff and iam a very beginner to this and couldnt able to resolve the issue. can someone please help me out to achieve this please.

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this is the workflow where as u can see the error at vertex ai-veo which is
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this is what i am suffereing from. where {
“endpoint”: “projects/***********************************/veo-3.0-generate-preview”,
“instances”: [
{
“prompt”: $json.TEXT_PROMPT
}
],
“parameters”: {
“aspectRatio”: “9:16”,
“sampleCount”: 1,
“durationSeconds”: “8”,
“personGeneration”: “allow_all”,
“addWatermark”: true,
“includeRaiReason”: true,
“generateAudio”: true
}
} this is the body used as shown in above and the error is pasted here below{
“errorMessage”: “JSON parameter needs to be valid JSON”,
“errorDetails”: {},
“n8nDetails”: {
“nodeName”: “Vertex AI-VEO”,
“nodeType”: “n8n-nodes-base.httpRequest”,
“nodeVersion”: 4.2,
“itemIndex”: 0,
“time”: “29/7/2025, 9:32:35 am”,
“n8nVersion”: “1.103.2 (Self Hosted)”,
“binaryDataMode”: “default”,
“stackTrace”: [
“NodeOperationError: JSON parameter needs to be valid JSON”,
" at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-nodes-base@file+packages+nodes-base_@[email protected]_asn1.js@5_1af219c3f47f2a1223ec4ccec249a974/node_modules/n8n-nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts:366:15)“,
" at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1211:32)”,
" at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1581:38",
" at processTicksAndRejections (node:internal/process/task_queues:105:5)“,
" at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2157:11”
]
}
} this is the error. can someone help me out please

2

Hey @VAMSI_NAIK_Banothu hope all is good. Welcome.

The issue is not with URL but with the body. Could you share how the JSON is rendered for the HTTP Request body?

3

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and this is the body
{
“endpoint”: “projects/n8n-project-440404/locations/us-central1/publishers/google/models/veo-3.0-generate-preview”,
“instances”: [
{
“prompt”: $json.TEXT_PROMPT
}
],
“parameters”: {
“aspectRatio”: “9:16”,
“sampleCount”: 1,
“durationSeconds”: “8”,
“personGeneration”: “allow_all”,
“addWatermark”: true,
“includeRaiReason”: true,
“generateAudio”: true
}
}

4

Probably some part of json in the body of the request is not formatted correctly or missing. You can use {{ JSON.stringify ($json.output) }} this escape or force the correct format for json

If you paste it here the body json you use it we can help you better

5

Try to use $json.TEXT_PROMPT.toJsonString() instead.

6

{
“endpoint”: “projects/n8n-project-440404/locations/us-central1/publishers/google/models/veo-3.0-generate-preview”,
“instances”: [
{
“prompt”: $json.TEXT_PROMPT.toJsonString()
}
],
“parameters”: {
“aspectRatio”: “9:16”,
“sampleCount”: 1,
“durationSeconds”: “8”,
“personGeneration”: “allow_all”,
“addWatermark”: true,
“includeRaiReason”: true,
“generateAudio”: true
}
}
and error JSON parameter needs to be valid JSON again {
“errorMessage”: “JSON parameter needs to be valid JSON”,
“errorDetails”: {},
“n8nDetails”: {
“nodeName”: “Vertex AI-VEO”,
“nodeType”: “n8n-nodes-base.httpRequest”,
“nodeVersion”: 4.2,
“itemIndex”: 0,
“time”: “29/7/2025, 10:34:08 am”,
“n8nVersion”: “1.103.2 (Self Hosted)”,
“binaryDataMode”: “default”,
“stackTrace”: [
“NodeOperationError: JSON parameter needs to be valid JSON”,
" at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-nodes-base@file+packages+nodes-base_@[email protected]_asn1.js@5_1af219c3f47f2a1223ec4ccec249a974/node_modules/n8n-nodes-base/nodes/HttpRequest/V3/HttpRequestV3.node.ts:366:15)“,
" at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1211:32)”,
" at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1581:38",
" at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2157:11"
]
}
}

7

tried but error again

8

Can you please click on this and show us the full rendered json?

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9

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10

this needs to be surrounded by {{ and }}, and make sure the field is an expression.

{{ $json.TEXT_PROMPT.toJsonString() }}
1 Like
11

i guess its working will pin if i stuck again thanks so much and take my love

1 Like
12

i am facing new issue in fetching, i am trying for 9:16 potrait but geeting an error like
[
{
“name”:
“projects/n8n-connection-467209/locations/us-central1/publishers/google/models/veo-3.0-generate-preview/operations/b2a2681f-cd5f-4f40-ab0e-896cd06481c3”,
“done”:
true,
“error”:
{
“code”:
3,
“message”:
“Unsupported output video aspect ratio ASPECT_RATIO_9_16”
}
}
]

13

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14

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1 Like
15

opps sorry for asking such silly stuff. and thanks for ur corporation

1 Like
16

i got stuck again with new issue

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and
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17

Hey can u check the new issue and help to build the workflow please

18

how to change the aspect ratio in n8n , i am unable to figure out please help

19

Hey how did you solve this, I am stuck with the same issue, could you paste the code here, I am working on the same template, thanks bud!