diff --git a/packages/string-templates/src/helpers/constants.ts b/packages/string-templates/src/helpers/constants.ts
index ee84a1dc47..fb6bf4e4f5 100644
--- a/packages/string-templates/src/helpers/constants.ts
+++ b/packages/string-templates/src/helpers/constants.ts
@@ -36,6 +36,7 @@ export const HelperFunctionNames = {
   ALL: "all",
   LITERAL: "literal",
   JS: "js",
+  DECODE_ID: "decodeId",
 }
 
 export const LITERAL_MARKER = "%LITERAL%"
diff --git a/packages/string-templates/src/helpers/index.ts b/packages/string-templates/src/helpers/index.ts
index fe74a6d711..ea09c2c545 100644
--- a/packages/string-templates/src/helpers/index.ts
+++ b/packages/string-templates/src/helpers/index.ts
@@ -25,13 +25,29 @@ function isObject(value: string | any[]) {
   )
 }
 
-const HELPERS = [
+export const HELPERS = [
   // external helpers
   new Helper(HelperFunctionNames.OBJECT, (value: any) => {
     return new Handlebars.SafeString(JSON.stringify(value))
   }),
   // javascript helper
   new Helper(HelperFunctionNames.JS, processJS, false),
+  new Helper(HelperFunctionNames.DECODE_ID, (_id: string | { _id: string }) => {
+    if (!_id) {
+      return []
+    }
+    // have to replace on the way back as we swapped out the double quotes
+    // when encoding, but JSON can't handle the single quotes
+    const id = typeof _id === "string" ? _id : _id._id
+    const decoded: string = decodeURIComponent(id).replace(/'/g, '"')
+    try {
+      const parsed = JSON.parse(decoded)
+      return Array.isArray(parsed) ? parsed : [parsed]
+    } catch (err) {
+      // wasn't json - likely was handlebars for a many to many
+      return [_id]
+    }
+  }),
   // this help is applied to all statements
   new Helper(
     HelperFunctionNames.ALL,
diff --git a/packages/string-templates/test/helpers.spec.ts b/packages/string-templates/test/helpers.spec.ts
index 12de4f1c29..7ef09cb2a4 100644
--- a/packages/string-templates/test/helpers.spec.ts
+++ b/packages/string-templates/test/helpers.spec.ts
@@ -517,3 +517,44 @@ describe("helper overlap", () => {
     expect(output).toEqual("a")
   })
 })
+
+describe("Test the decodeId helper", () => {
+  it("should decode a valid encoded ID", async () => {
+    const encodedId = encodeURIComponent("[42]") // "%5B42%5D"
+    const output = await processString("{{ decodeId id }}", { id: encodedId })
+    expect(output).toBe("42")
+  })
+
+  it("Should return an unchanged string if the string isn't encoded", async () => {
+    const unencodedId = "forty-two"
+    const output = await processString("{{ decodeId id }}", { id: unencodedId })
+    expect(output).toBe("forty-two")
+  })
+
+  it("Should return a string of comma-separated IDs when passed multiple IDs in a URI encoded array", async () => {
+    const encodedIds = encodeURIComponent("[1,2,3]") // "%5B1%2C2%2C3%5D"
+    const output = await processString("{{ decodeId id }}", { id: encodedIds })
+    expect(output).toBe("1,2,3")
+  })
+
+  it("Handles empty array gracefully", async () => {
+    const output = await processString("{{ decodeId value }}", {
+      value: [],
+    })
+    expect(output).toBe("[[]]")
+  })
+
+  it("Handles undefined gracefully", async () => {
+    const output = await processString("{{ decodeId value }}", {
+      value: undefined,
+    })
+    expect(output).toBe("")
+  })
+
+  it("Handles null gracefully", async () => {
+    const output = await processString("{{ decodeId value }}", {
+      value: undefined,
+    })
+    expect(output).toBe("")
+  })
+})