expiry_list and intraday_minute_data return failure dict with JSON parse error (NIFTY, v2 Data API)

[xk22vzcf5f-hue]

Summary

I am using the Dhan Data API (Data APIs plan is active) with the official DhanHQ-py client.
For NIFTY Index (security_id = 13, exchange segment = "IDX_I"), both option chain expiries and intraday historical data calls are consistently returning a failure dict with JSON parse errors, even during live market hours.

This makes it impossible to fetch NIFTY option chain or intraday candles via Data APIs.

---

Environment

• Library: DhanHQ-py (latest from PyPI, v2.x)
• Auth: client_id + access-token (Data API subscription)
• Instrument: NIFTY Index
  • security_id = 13
  • exchange_segment = "IDX_I"
  • instrument_type = "INDEX"

---

Code to Reproduce

import os, json
from dhanhq import dhanhq
from dotenv import load_dotenv

load_dotenv()

CLIENT_ID = os.getenv("DHAN_CLIENT_ID")
ACCESS_TOKEN = os.getenv("DHAN_ACCESS_TOKEN")

dhan = dhanhq(CLIENT_ID, ACCESS_TOKEN)

# 1) NIFTY option chain expiry_list
expiries = dhan.expiry_list(13, "IDX_I")
print("expiry_list raw:", type(expiries), expiries)
with open("nifty_expiries_raw.json", "w") as f:
    json.dump(expiries, f, indent=2)

# 2) NIFTY intraday minute data
intraday = dhan.intraday_minute_data(
    security_id=13,
    exchange_segment="IDX_I",
    instrument_type="INDEX",
    from_date="2025-12-20",   # example trading day
    to_date="2025-12-20"
)
print("intraday raw:", type(intraday), intraday)
with open("nifty_intraday_raw.json", "w") as f:
    json.dump(intraday, f, indent=2)

======================================================================================


### **Actual Output**

For expiry_list(13, "IDX_I"):

python
{'status': 'failure',
 'remarks': 'Extra data: line 1 column 5 (char 4)',
 'data': ''}
For intraday_minute_data(...):

python
{'status': 'failure',
 'remarks': 'Expecting value: line 1 column 1 (char 0)',
 'data': ''}
So instead of a list of expiries or a list of OHLCV records, the SDK returns a single dict with status: failure and a JSON parse error in remarks.

### **Expected Behaviour**

expiry_list(13, "IDX_I") should return a list of expiry objects for NIFTY Index, as per the v2 option-chain documentation.

intraday_minute_data(...) should return a list/iterable of intraday OHLCV records for the requested date range.

### Notes / Questions

- Is this a known issue with the underlying /v2/optionchain/expirylist and historical data endpoints for Data API users?
- 
- Has the response format changed (e.g. wrapped in another JSON field) and not yet updated in DhanHQ-py?
- 
- Could you please share:
- 
- A working curl example for NIFTY option chain expiries (v2)
- 
- A working intraday historical example for NIFTY Index
- 
- so that I can test against the raw HTTP response and update my scripts accordingly?
- 

Thanks.

[dhan-oss]

The JSON parse error on expiry_list and intraday_minute_data for NIFTY (security_id=13, IDX_I) is likely caused by the API returning a non-JSON response for that specific segment/instrument combination under the Data API plan.

Please verify:

1. Your Data API subscription is active and covers index instruments.
2. The exchange_segment for NIFTY index should be IDX_I.
3. Try the call outside market hours — some endpoints return errors during data refresh windows.

If the issue persists, please write to apihelp@dhan.co with your Client ID, the exact call you're making, and the raw error response.