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fix: handle arrays properly in FormData #1431

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fix: handle arrays properly in FormData #1431

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c1b22ef
fix: handle arrays properly in FormData
omarmciver Sep 23, 2025
e4c4bae
fix: apply formatter to test fixture
omarmciver Sep 23, 2025
b9da1cd
refactor: simplify FormData type checking and fix string handling
omarmciver Oct 14, 2025
6e854b8
test: update snapshots for FormData refactoring
omarmciver Oct 14, 2025
abc99ef
Update templates/base/http-clients/fetch-http-client.ejs
omarmciver Oct 24, 2025
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18 changes: 10 additions & 8 deletions templates/base/http-clients/fetch-http-client.ejs
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Original file line number Diff line number Diff line change
Expand Up @@ -113,14 +113,16 @@ export class HttpClient<SecurityDataType = unknown> {

return Object.keys(input || {}).reduce((formData, key) => {
const property = input[key];
formData.append(
key,
property instanceof Blob ?
property :
typeof property === "object" && property !== null ?
JSON.stringify(property) :
`${property}`
);
const propertyContent = property instanceof Array ? property : [property];

for (const formItem of propertyContent) {
formData.append(
key,
formItem instanceof Blob || typeof formItem === "string"
? formItem
: JSON.stringify(formItem)
);
}
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Bug: FormData Serialization Fails with BigInt and Undefined

The FormData serialization logic now uses JSON.stringify for non-Blob/non-string values, which introduces two issues. BigInt values now cause a TypeError. Also, undefined values are passed as the undefined primitive to formData.append(), relying on implicit browser conversion instead of the previous explicit string conversion, which may lead to unexpected behavior.

Fix in Cursor Fix in Web

return formData;
}, new FormData());
},
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