Send filter array operators as a single form field on POST requests (v3.30.1)

CHANGELOG.md

@@ -1,3 +1,8 @@
+### v3.30.1 (2026-08-11)
+* * *
+### Bug Fixes: 
+- Filter operators `in`, `not_in` and `between` are now sent as a single form field on POST requests, matching the behaviour on list requests. Filters on export operations, such as `subscription[updated_at][between]`, were index-encoded and therefore ignored by the API.
+
 ### v3.30.0 (2026-07-30)
 * * *
 ### New Resources:

VERSION

@@ -1 +1 @@
-3.30.0
+3.30.1

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chargebee",
-  "version": "3.30.0",
+  "version": "3.30.1",
   "description": "A library for integrating with Chargebee.",
   "scripts": {
     "prepack": "npm install && npm run build",

src/environment.ts

@@ -9,7 +9,7 @@ export const Environment = {
   hostSuffix: '.chargebee.com',
   apiPath: '/api/v2',
   timeout: DEFAULT_TIME_OUT,
-  clientVersion: 'v3.30.0',
+  clientVersion: 'v3.30.1',
   port: DEFAULT_PORT,
   timemachineWaitInMillis: DEFAULT_TIME_MACHINE_WAIT,
   exportWaitInMillis: DEFAULT_EXPORT_WAIT,

src/util.ts

@@ -138,9 +138,12 @@ export function getApiURL(
     (urlSuffix !== null ? urlSuffix : '')
   );
 }
+// Filter operators whose value is the whole array, sent as a single field
+// (e.g. updated_at[between]=[1704067200,1717199999]).
+const arrayOperators: string[] = ['in', 'not_in', 'between'];
+
 export function serialize(paramObj: any) {
   let key: string, value: string | Object;
-  let array_ops: string[] = ['in', 'not_in', 'between'];
   for (key in paramObj) {
     value = paramObj[key];
     if (typeof value === 'object' && isObject(value)) {
@@ -149,7 +152,7 @@ export function serialize(paramObj: any) {
       for (child_key in value) {
         key = key + '[' + child_key + ']';
         paramObj[key] = (value as any)[child_key];
-        if (array_ops.includes(child_key)) {
+        if (arrayOperators.includes(child_key)) {
           paramObj[key] = JSON.stringify((value as any)[child_key]);
         }
       }
@@ -211,6 +214,15 @@ export function encodeParams(
         );
       }
       serialized.push(encodeURIComponent(key) + '=' + attrVal);
+    } else if (isArray(value) && arrayOperators.includes(originalKey)) {
+      // An empty filter is not a filter, so leave it out of the request.
+      if (value.length > 0) {
+        serialized.push(
+          encodeURIComponent(key) +
+            '=' +
+            encodeURIComponent(JSON.stringify(value)),
+        );
+      }
     } else if (
       isArray(value) &&
       !(jsonKeys && jsonKeys[originalKey] === level)

test/requestWrapper.test.ts

@@ -88,6 +88,29 @@ describe('RequestWrapper - request body', () => {
       expect(body).to.not.equal('');
       expect(body).to.include('first_name=John');
     });
+
+    it('should send filter array operators as a single field, not indexed entries', async () => {
+      responseFactory = () =>
+        new Response(JSON.stringify({ export: { id: 'export_123' } }), {
+          status: 200,
+          headers: { 'Content-Type': 'application/json' },
+        });
+
+      const chargebee = createChargebee();
+      await chargebee.export.subscriptions({
+        subscription: {
+          updated_at: { between: [1704067200, 1717199999] },
+          id: { in: ['sub_1', 'sub_2'] },
+        },
+      });
+
+      const body = decodeURIComponent(await capturedRequests[0].text());
+      expect(body).to.include(
+        'subscription[updated_at][between]=[1704067200,1717199999]',
+      );
+      expect(body).to.include('subscription[id][in]=["sub_1","sub_2"]');
+      expect(body).to.not.include('[between][0]');
+    });
   });
 });
 

test/util.test.ts

@@ -0,0 +1,226 @@
+import { expect } from 'chai';
+import { encodeListParams, encodeParams, serialize } from '../src/util.js';
+
+// Bracket notation is easier to read decoded; the escaping itself is asserted
+// separately in "value escaping".
+function encoded(paramObj: any, jsonKeys?: any): string {
+  return decodeURIComponent(
+    encodeParams(paramObj, undefined, undefined, undefined, jsonKeys),
+  );
+}
+
+describe('encodeParams - scalars', () => {
+  it('should encode simple attributes', () => {
+    expect(
+      encoded({ first_name: 'John', last_name: 'Doe', locale: 'fr-CA' }),
+    ).to.equal('first_name=John&last_name=Doe&locale=fr-CA');
+  });
+
+  it('should encode numbers and booleans', () => {
+    expect(
+      encoded({ quantity: 1, unit_price: 0, auto_collection: true }),
+    ).to.equal('quantity=1&unit_price=0&auto_collection=true');
+  });
+
+  it('should escape reserved characters and encode spaces as +', () => {
+    expect(encodeParams({ first_name: 'John Doe' })).to.equal(
+      'first_name=John+Doe',
+    );
+    expect(encodeParams({ email: 'john+cb@test.com' })).to.equal(
+      'email=john%2Bcb%40test.com',
+    );
+    expect(encodeParams({ note: 'a&b=c' })).to.equal('note=a%26b%3Dc');
+  });
+
+  it('should keep empty strings but drop null and undefined', () => {
+    expect(encoded({ a: '', b: null, c: undefined, d: 'x' })).to.equal(
+      'a=&d=x',
+    );
+  });
+});
+
+describe('encodeParams - nested objects', () => {
+  it('should encode a sub-resource as bracket notation', () => {
+    expect(
+      encoded({ billing_address: { city: 'Walnut', state: 'California' } }),
+    ).to.equal(
+      'billing_address[city]=Walnut&billing_address[state]=California',
+    );
+  });
+
+  it('should encode arbitrarily deep nesting', () => {
+    expect(encoded({ ramp: { effective_from: { on: 1704067200 } } })).to.equal(
+      'ramp[effective_from][on]=1704067200',
+    );
+  });
+
+  it('should drop empty objects', () => {
+    expect(encoded({ meta_data: {}, a: 'x' })).to.equal('a=x');
+  });
+});
+
+describe('encodeParams - arrays', () => {
+  it('should index-encode an array of primitives', () => {
+    expect(encoded({ coupon_ids: ['FIFTYOFF', 'TENOFF'] })).to.equal(
+      'coupon_ids[0]=FIFTYOFF&coupon_ids[1]=TENOFF',
+    );
+  });
+
+  it('should drop empty arrays', () => {
+    expect(encoded({ coupon_ids: [], a: 'x' })).to.equal('a=x');
+  });
+
+  it('should index an array of sub-resources by field, then position', () => {
+    expect(
+      encoded({
+        subscription_items: [
+          { item_price_id: 'day-pass-USD', unit_price: 100 },
+          { item_price_id: 'basic-USD', quantity: 1 },
+        ],
+      }),
+    ).to.equal(
+      'subscription_items[item_price_id][0]=day-pass-USD&subscription_items[unit_price][0]=100&subscription_items[item_price_id][1]=basic-USD&subscription_items[quantity][1]=1',
+    );
+  });
+
+  it('should index an array nested inside an array of sub-resources', () => {
+    expect(
+      encoded({
+        item_constraints: [
+          { constraint: 'specific', item_price_ids: ['basic', 'pro'] },
+        ],
+      }),
+    ).to.equal(
+      'item_constraints[constraint][0]=specific&item_constraints[item_price_ids][0][0]=basic&item_constraints[item_price_ids][0][1]=pro',
+    );
+  });
+});
+
+describe('encodeParams - jsonKeys', () => {
+  it('should JSON-encode a key registered at the matching level', () => {
+    expect(encoded({ meta_data: { plan: 'pro' } }, { meta_data: 0 })).to.equal(
+      'meta_data={"plan":"pro"}',
+    );
+  });
+
+  it('should pass an already stringified value through untouched', () => {
+    expect(encoded({ meta_data: '{"plan":"pro"}' }, { meta_data: 0 })).to.equal(
+      'meta_data={"plan":"pro"}',
+    );
+  });
+
+  it('should JSON-encode a nested key registered at its own level', () => {
+    expect(
+      encoded(
+        { item_constraints: [{ item_price_ids: ['basic'] }] },
+        { item_price_ids: 1 },
+      ),
+    ).to.equal('item_constraints[item_price_ids][0]=["basic"]');
+  });
+
+  it('should fall back to bracket notation when the level does not match', () => {
+    expect(encoded({ meta_data: { plan: 'pro' } }, { meta_data: 1 })).to.equal(
+      'meta_data[plan]=pro',
+    );
+  });
+
+  it('should encode a null value as empty', () => {
+    expect(encoded({ meta_data: null }, { meta_data: 0 })).to.equal(
+      'meta_data=',
+    );
+  });
+});
+
+describe('encodeParams - filter array operators', () => {
+  it('should send between as a single field for a nested filter', () => {
+    expect(
+      encoded({
+        export_type: 'import_friendly_data',
+        ramp: { effective_from: { between: [1704067200, 1717199999] } },
+      }),
+    ).to.equal(
+      'export_type=import_friendly_data&ramp[effective_from][between]=[1704067200,1717199999]',
+    );
+  });
+
+  it('should send between as a single field for a top-level filter', () => {
+    expect(
+      encoded({ updated_at: { between: [1704067200, 1717199999] } }),
+    ).to.equal('updated_at[between]=[1704067200,1717199999]');
+  });
+
+  it('should send in and not_in as single fields', () => {
+    expect(
+      encoded({
+        subscription: {
+          id: { in: ['sub_1', 'sub_2'] },
+          status: { not_in: ['cancelled'] },
+        },
+      }),
+    ).to.equal(
+      'subscription[id][in]=["sub_1","sub_2"]&subscription[status][not_in]=["cancelled"]',
+    );
+  });
+
+  it('should leave other operators on the same filter alone', () => {
+    expect(
+      encoded({
+        subscription: {
+          updated_at: { after: 1704067200, between: [1704067200, 1717199999] },
+        },
+      }),
+    ).to.equal(
+      'subscription[updated_at][after]=1704067200&subscription[updated_at][between]=[1704067200,1717199999]',
+    );
+  });
+
+  it('should pass an already stringified operator value through untouched', () => {
+    expect(
+      encoded({ updated_at: { between: '[1704067200,1717199999]' } }),
+    ).to.equal('updated_at[between]=[1704067200,1717199999]');
+  });
+
+  it('should not touch a scalar under an operator key', () => {
+    expect(encoded({ subscription: { id: { in: 'sub_1' } } })).to.equal(
+      'subscription[id][in]=sub_1',
+    );
+  });
+
+  it('should omit an operator whose array is empty', () => {
+    expect(encoded({ updated_at: { between: [] }, limit: 5 })).to.equal(
+      'limit=5',
+    );
+  });
+});
+
+describe('serialize - GET query string', () => {
+  it('should produce the same filter encoding as the request body', () => {
+    const params = {
+      ramp: { effective_from: { between: [1704067200, 1717199999] } },
+    };
+    const query = decodeURIComponent(encodeParams(serialize(params)));
+
+    expect(query).to.equal(
+      'ramp[effective_from][between]=[1704067200,1717199999]',
+    );
+  });
+
+  it('should flatten sub-resources into bracket notation', () => {
+    expect(serialize({ billing_address: { city: 'Walnut' } })).to.deep.equal({
+      'billing_address[city]': 'Walnut',
+    });
+  });
+});
+
+describe('encodeListParams', () => {
+  it('should JSON-encode array values and leave scalars alone', () => {
+    expect(
+      decodeURIComponent(
+        encodeListParams({
+          'updated_at[between]': [1704067200, 1717199999],
+          limit: 5,
+        }),
+      ),
+    ).to.equal('updated_at[between]=[1704067200,1717199999]&limit=5');
+  });
+});