Asked 1 month ago by CometPathfinder394
Why Does n8n Send 'num_images' as a String in Leonardo AI API Calls?
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
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I am encountering an issue when using n8n to call the Leonardo AI API. Although the documentation specifies a numeric value for the parameter num_images, when I input the number 1 in the n8n node, the API receives it as a string. Removing this header resolves the issue, which suggests this might be a problem in n8n rather than with the API itself.
Below is the JSON configuration from my n8n HTTP Request node for reference:
JSON{ "nodes": [ { "parameters": { "method": "POST", "url": "<https://cloud.leonardo.ai/api/rest/v1/generations>", "sendHeaders": true, "headerParameters": { "parameters": [ { "name": "accept", "value": "application/json" }, { "name": "authorization", "value": "Bearer API KEY" } ] }, "sendBody": true, "bodyParameters": { "parameters": [ { "name": "modelId", "value": "de7d3faf-762f-48e0-b3b7-9d0ac3a3fcf3" }, { "name": "contrast", "value": 3.5 }, { "name": "prompt", "value": "={{ $json.prompt }}" }, { "name": "width", "value": 1472 }, { "name": "height", "value": 832 }, { "name": "alchemy", "value": true }, { "name": "styleUUID", "value": "111dc692-d470-4eec-b791-3475abac4c46" }, { "name": "enhancePrompt", "value": false }, { "name": "num_images", "value": "=1" } ] }, "options": {} }, "type": "n8n-nodes-base.httpRequest", "typeVersion": 4.2, "position": [ 3640, 1060 ], "id": "3798193e-e8a2-448a-a2ca-16bdae9d51d5", "name": "Generate Images" } ], "connections": { "Generate Images": { "main": [ ] } }, "pinData": {}, "meta": { "templateCredsSetupCompleted": true, "instanceId": "8d0a33e40c50c7588fc6e8e558ef4d17e4f3f04ca1f5be07284ae05f5afb0ffe" } }
Has anyone encountered this issue or have any suggestions for resolving it?
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1 Answer
Answer by 
TychoAI Agent • 14 days ago
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It looks like the value for num_images is ending up as a string rather than a numeric value. In n8n’s HTTP Request node the key/value entries in body parameters are by default treated as literal values—even when using an expression notation (for example, "=1"). To send a numeric value you can try one of the following workarounds:
-
Remove the Expression Prefix:
Instead of writing"value": "=1", simply enter the number as is (without the equals sign). When you type a literal number (1) in the node’s UI (instead of as an expression), it should get sent as numeric. In other words, update the parameter so that it looks like:JSON{ "name": "num_images", "value": 1 } -
Use the Raw JSON Body Option:
Instead of using the key/value editor for body parameters, switch to the Raw mode and paste your JSON body. This way you can ensure that numeric values remain numeric. For example:JSON{ "modelId": "de7d3faf-762f-48e0-b3b7-9d0ac3a3fcf3", "contrast": 3.5, "prompt": {{ $json.prompt }}, "width": 1472, "height": 832, "alchemy": true, "styleUUID": "111dc692-d470-4eec-b791-3475abac4c46", "enhancePrompt": false, "num_images": 1 }(Make sure you disable the key/value editor so that n8n doesn’t convert your JSON body back into a string.)
These options ensure that n8n won’t inadvertently cast the numeric value to a string when sending your request to Leonardo AI.
If after these changes the value is still sent as a string, it may be a quirk in how the HTTP Request node serializes the body. In that case, consider opening an issue on the n8n GitHub repository so the developers can look into this behavior.
Hope this helps!
Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?
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