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The error Disallowing path manipulation attempt can have two different causes: your code may pass a prebuilt URL or path as one interpolation, or a dynamic path segment may contain a character the route helper treats as structural. Check what each interpolation contains before changing the route. Keep fixed slashes in the route template, and pass dynamic values as individual components.
First, find where the path separators come from
Inspect the route call that throws and the values immediately before it. The error message alone does not distinguish the two causes. Ask whether a slash is part of the template’s fixed path, or arrived inside an interpolated value.
- If an interpolation contains the whole URL or path, the route was assembled before it reached the tagged template.
- If the template contains the path structure but a dynamic segment still fails, inspect that value for a slash or other structural text.
Cause 1: a prebuilt URL or path is passed as one value
The route tagged template needs to distinguish path structure from dynamic data. If your code first builds a full path string and then interpolates that string, the helper sees the separators as part of a dynamic value.
Keep the fixed path in the template and interpolate only the variable component. For example, use route`/rest/api/3/issue/${issueKey}` rather than assembling the URL first and passing it as route`${url_bad}`. This pattern is shown in an Atlassian Developer Community discussion.
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Cause 2: a dynamic path segment contains structural text
A value can be a single logical identifier in your code but still contain a slash at runtime. Branch and tag names are examples: a slash in the name may be interpreted as a path separator and trigger the same error.
If the value is intended to remain one path segment, encode that component with encodeURIComponent before interpolating it. A community user reported resolving the error for slash-containing branch or tag names this way. Alternatively, validate or normalize the value against the identifier format your application expects and reject values that do not fit. Do not encode the whole route or an entire query string as if it were one path component.
Check the installed package before relying on edge cases
The exact character-level behavior can depend on the installed @forge/api implementation. A developer article reports testing versions 6.4.3 and 8.0.4 and describes path-position checks for characters or patterns including slash, backslash, question mark, hash, and doubled dots. It also reports that query interpolation is handled separately from path interpolation. These are author-reported implementation details, not an official compatibility guarantee; inspect the exact package version in your project before depending on specific edge cases.
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For a quick local check, reproduce the route call against the exact installed package version and inspect the result or error. The article describes a Node-based probe that does not require a Forge app or deployment, but its reported results apply to the versions it tested, not necessarily later releases.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do not use a trusted-route escape hatch as sanitization
assumeTrustedRoute is a trust assertion, not a general-purpose fix for data-derived paths. The community discussion describes the function signature as carrying that assumption; the developer article reports that a trusted Route bypasses the ordinary path check. Use such an escape hatch only when the entire route string is controlled and trusted, not to make arbitrary input pass the guard.
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Choose the repair based on the value that contains the separator
| What you find | Repair |
|---|---|
| The interpolation contains a prebuilt full path or URL. | Move fixed path structure into the route template and interpolate only individual dynamic components. |
| A dynamic segment contains a slash or other structural text. | If it must remain one segment, encode that component; otherwise validate or normalize it to the expected identifier format. |
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