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# 9. JSON Structure Reference

The following appendix provides a quick reference to all the JSON structures that you can supply to CouchDB, or get in return to requests.

## 9.1. All Database Documents

Field | Description
--- | ---
total_rows | Number of documents in the database/view
offset | Offset where the document list started
update_seq (optional) | Current update sequence for the database
rows [array] | Array of document object

## 9.2. Bulk Document Response

Field | Description
--- | ---
docs [array] | Bulk Docs Returned Documents
id | Document ID
error | Error type
reason | Error string with extended reason

## 9.3. Bulk Documents

Field | Description
--- | ---
all_or_nothing (optional) | Sets the database commit mode to use all-or-nothing semantics
docs [array] | Bulk Documents Document
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)
_deleted (optional) | Whether the document should be deleted

## 9.4. Changes information for a database

Field | Description
--- | ---
last_seq | Last change sequence number
results [array] | Changes made to a database
seq | Update sequence number
id | Document ID
changes [array] | List of changes, field-by-field, for this document

## 9.5. CouchDB Document

Field | Description
--- | ---
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)

## 9.6. CouchDB Error Status

Field | Description
--- | ---
id | Document ID
error | Error type
reason | Error string with extended reason

## 9.7. CouchDB database information object

Field | Description
--- | ---
db_name | The name of the database.
committed_update_seq | The number of committed update.
doc_count | A count of the documents in the specified database.
doc_del_count | Number of deleted documents
compact_running | Set to true if the database compaction routine is operating on this database.
disk_format_version | The version of the physical format used for the data when it is stored on disk.
disk_size | Size in bytes of the data as stored on the disk. Views indexes are not included in the calculation.
instance_start_time | Timestamp of when the database was created, expressed in milliseconds since the epoch.
purge_seq | The number of purge operations on the database.
update_seq | The current number of updates to the database.

## 9.8. Design Document

Field | Description
--- | ---
_id | Design Document ID
_rev | Design Document Revision
views | View
viewname | View Definition
map | Map Function for View
reduce (optional) | Reduce Function for View

## 9.9. Design Document Information

Field | Description
--- | ---
name | Name/ID of Design Document
view_index | View Index
compact_running | Indicates whether a compaction routine is currently running on the view
disk_size | Size in bytes of the view as stored on disk
language | Language for the defined views
purge_seq | The purge sequence that has been processed
signature | MD5 signature of the views for the design document
update_seq | The update sequence of the corresponding database that has been indexed
updater_running | Indicates if the view is currently being updated
waiting_clients | Number of clients waiting on views from this design document
waiting_commit | Indicates if there are outstanding commits to the underlying database that need to processed

## 9.10. Document with Attachments

Field | Description
--- | ---
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)
_attachments (optional) | Document Attachment
filename | Attachment information
content_type | MIME Content type string
data | File attachment content, Base64 encoded

## 9.11. List of Active Tasks

Field | Description
--- | ---
tasks [array] | Active Task
pid | Process ID
status | Task status message
task | Task name
type | Operation Type

## 9.12. Replication Settings

Field | Description
--- | ---
source | Source database name or URL
target | Target database name or URL
create_target (optional) | Creates the target database
continuous (optional) | Configure the replication to be continuous
cancel (optional) | Cancels the replication
doc_ids (optional) | Array of document IDs to be synchronized
proxy (optional) | Address of a proxy server through which replication should occur

## 9.13. Replication Status

Field | Description
--- | ---
ok | Replication status
session_id | Unique session ID
source_last_seq | Last sequence number read from source database
history [array] | Replication History
session_id | Session ID for this replication operation
recorded_seq | Last recorded sequence number
docs_read | Number of documents read
docs_written | Number of documents written to target
doc_write_failures | Number of document write failures
start_time | Date/Time replication operation started
start_last_seq | First sequence number in changes stream
end_time | Date/Time replication operation completed
end_last_seq | Last sequence number in changes stream
missing_checked | Number of missing documents checked
missing_found | Number of missing documents found

## 9.14. Request object

Field | Description
--- | ---
body | Request body data as string. If request method is GET method contains this field contains `"undefined"` value, while if DELETE or HEAD value is `""` (empty string)
cookie | Cookies object.
form | Form data object. Contains decoded body as key-value pairs if Content-Type header was `application/x-www-form-urlencoded`.
headers | Request headers object.
id | Requested document id string if it was specified or `null` otherwise.
info | Database information
method | Request method as string or array. String value is method is one of: HEAD, GET, POST, PUT, DELETE, OPTIONS, and TRACE, otherwise it will be represented as array of char codes.
path | List of requested path sections.
peer | Request source IP address.
query | URL query parameters object. Note that multiple keys not supported and last key value suppress others.
requested_path | List of actual requested path section.
raw_path | Raw requested path string.
secObj | Security Object.
userCtx | User Context Object.
uuid | Generated UUID by specified algorithm in config file.

    {
        "body": "undefined",
        "cookie": {
            "AuthSession": "cm9vdDo1MDZBRjQzRjrfcuikzPRfAn-EA37FmjyfM8G8Lw",
            "m": "3234"
        },
        "form": {},
        "headers": {
            "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
            "Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.3",
            "Accept-Encoding": "gzip,deflate,sdch",
            "Accept-Language": "en-US,en;q=0.8",
            "Connection": "keep-alive",
            "Cookie": "m=3234:t|3247:t|6493:t|6967:t|34e2:|18c3:t|2c69:t|5acb:t|ca3:t|c01:t|5e55:t|77cb:t|2a03:t|1d98:t|47ba:t|64b8:t|4a01:t; AuthSession=cm9vdDo1MDZBRjQzRjrfcuikzPRfAn-EA37FmjyfM8G8Lw",
            "Host": "127.0.0.1:5984",
            "User-Agent": "Mozilla/5.0 (Windows NT 5.2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7"
        },
        "id": "foo",
        "info": {
            "committed_update_seq": 2701412,
            "compact_running": false,
            "data_size": 7580843252,
            "db_name": "mailbox",
            "disk_format_version": 6,
            "disk_size": 14325313673,
            "doc_count": 2262757,
            "doc_del_count": 560,
            "instance_start_time": "1347601025628957",
            "purge_seq": 0,
            "update_seq": 2701412
        },
        "method": "GET",
        "path": [
            "mailbox",
            "_design",
            "request",
            "_show",
            "dump",
            "foo"
        ],
        "peer": "127.0.0.1",
        "query": {},
        "raw_path": "/mailbox/_design/request/_show/dump/foo",
        "requested_path": [
            "mailbox",
            "_design",
            "request",
            "_show",
            "dump",
            "foo"
        ],
        "secObj": {
            "admins": {
                "names": [
                    "Bob"
                ],
                "roles": []
            },
            "members": {
                "names": [
                    "Mike",
                    "Alice"
                ],
                "roles": []
            }
        },
        "userCtx": {
            "db": "mailbox",
            "name": "Mike",
            "roles": [
                "user"
            ]
        },
        "uuid": "3184f9d1ea934e1f81a24c71bde5c168"
    }

## 9.15. Response object

Field | Description
--- | ---
code | HTTP status code number.
json | JSON encodable object. Implicitly sets Content-Type header as `application/json`.
body | Raw response text string. Implicitly sets Content-Type header as `text/html; charset=utf-8`.
base64 | Base64 encoded string. Implicitly sets Content-Type header as `application/binary`.
headers | Response headers object. Content-Type header from this object overrides any implicitly assigned one.
stop | boolean signal to stop iteration over view result rows (for list functions only)

Warning

`body`, `base64` and `json` object keys are overlaps each other and the last wins. Since most realizations of key-value objects doesn’t preserve key order mixing them may create confusing situation. Try to use only one of them.

Note

Any custom property makes CouchDB raise internal exception. Also Response object could be a simple string value which would be implicitly wrapped into `{"body": ...}` object.

## 9.16. Returned CouchDB Document with Detailed Revision Info

Field | Description
--- | ---
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)
_revs_info [array] | CouchDB Document Extended Revision Info
rev | Full revision string
status | Status of the revision

## 9.17. Returned CouchDB Document with Revision Info

Field | Description
--- | ---
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)
_revisions | CouchDB Document Revisions
ids [array] | Array of valid revision IDs, in reverse order (latest first)
start | Prefix number for the latest revision

## 9.18. Returned Document with Attachments

Field | Description
--- | ---
_id (optional) | Document ID
_rev (optional) | Revision ID (when updating an existing document)
_attachments (optional) | Document Attachment
filename | Attachment
stub | Indicates whether the attachment is a stub
content_type | MIME Content type string
length | Length (bytes) of the attachment data
revpos | Revision where this attachment exists

## 9.19. Security Object

Field | Description
--- | ---
admins | Roles/Users with admin privileges
roles [array] | List of roles with parent privilege
users [array] | List of users with parent privilege
readers | Roles/Users with reader privileges
roles [array] | List of roles with parent privilege
users [array] | List of users with parent privilege

    {
        "admins": {
            "names": [
                "Bob"
            ],
            "roles": []
        },
        "members": {
            "names": [
                "Mike",
                "Alice"
            ],
            "roles": []
        }
      }

## 9.20. User Context Object

Field | Description
--- | ---
db | Database name in context of provided operation.
name | User name.
roles | List of user roles.

    {
        "db": "mailbox",
        "name": null,
        "roles": [
            "_admin"
        ]
    }

## 9.21. View Head Information

Field | Description
--- | ---
total_rows | Number of documents in the view
offset | Offset where the document list started

    {
        "total_rows": 42,
        "offset": 3
    }

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