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# Tips
## Query data from an instance
For maintenance reason, we sometime need to check data on a specific instance. For that we use postman to send get / post / delete data.
All posibility are described in the [data section of Cozy documentation](https://docs.cozy.io/en/cozy-stack/data-system/).
**Example**
The example will describ how to query userChallenge data from an instance.
First, you need to be able to connect to the instance in order to retrive the bearer and the cozysessid.
Then use postman to query the data:
```
Verb: GET
Request: https://ecolyotest.cozy.self-data.alpha.grandlyon.com/data/com.grandlyon.ecolyo.userchallenge/_all_docs?include_docs=true
Header:
Accept: application/json
content-type: application/json
Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Cookie: cozysessid=AAAAAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
```
The result will then be retrieve by postman:
```
{
"total_rows": 1,
"offset": 0,
"rows": [
{
"id": "a353b985c0c5f09229b0acd6b2f37f1b",
"key": "a353b985c0c5f09229b0acd6b2f37f1b",
...
]
}
```