| LIBBSON_LEGACY_EXTENDED_JSON(3) | libbson | LIBBSON_LEGACY_EXTENDED_JSON(3) |
libbson can produce a non-portable Legacy Extended JSON format.
WARNING:
Use of the Legacy Extended JSON format is discouraged.
Prefer Canonical Extended JSON or Relaxed Extended JSON for portability.
MongoDB Extended JSON (v2) describes the preferred Relaxed Extended JSON format and Canonical Extended Formats
libbson's Legacy Extended JSON format matches Relaxed Extended JSON with the following exceptions. Notation is borrowed from MongoDB Extended JSON (v2):
| Type | Legacy Extended JSON |
| Binary | 0.0 3.5 { "$binary": "<payload>", "$type": "<t>" } 168u 168u |
| Date | 0.0 3.5 { "$date" : "<millis>" } 168u 168u |
| Regular Expression | 0.0 3.5 { "$regex" : "<regexPattern>", "$options" : "<options>" } 168u 168u |
| DBPointer (deprecated) | 0.0 3.5 { "$ref" : "<collection namespace>", "$id" : "<ObjectId bytes>" } 168u 168u |
| Symbol (deprecated) | 0.0 3.5 "<string>" 168u 168u |
| Double infinity | infinity or inf without quotes. Implementation defined. Produces invalid JSON. |
| Double NaN | nan or nan(n-char-sequence). Implementation defined. Produces invalid JSON. |
AUTHOR¶
MongoDB, Inc
COPYRIGHT¶
2009-present, MongoDB, Inc.
| October 8, 2025 | 2.1.2 |