IDBCursor

IndexedDB indexeddb

Baseline: Widely available on the web, in every major browser since Sep 2021, and long enough to count on (since Mar 2024).

niso: Partial 95%. 2929 of 3061 subtests pass, by system: Linux 95%, macOS 95%. Engines: QuickJS, the engine niso's WPT run uses; Node and Porffor have no recorded run. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · IDBCursor, IDBCursorWithValue, IDBDatabase, IDBFactory

IDBCursor is an interface in idl/indexeddb.webidl, exposed in Window, Worker. What it does is on MDN; this page says what niso has of it.

Status

The web features its members belong to, each with its Baseline status on the web and how much of the feature’s WPT suite passes in niso (see Web platform support).

Feature	On the web	In niso	Members
IndexedDB	Widely available	Partial 95% 2929 of 3061 subtests pass	11

Members

source

attribute

readonly attribute object source;

int32_t niso_idb_cursor_get_source(niso_dom* dom, niso_handle self, niso_handle* out);

The standard’s type is (IDBObjectStore or IDBIndex).

direction

attribute

readonly attribute IDBCursorDirection direction;

int32_t niso_idb_cursor_get_direction(niso_dom* dom, niso_handle self, niso_str* out);

key

attribute

[NisoGlue] readonly attribute any key;

primaryKey

attribute

[NisoGlue] readonly attribute any primaryKey;

request

attribute

[SameObject] readonly attribute IDBRequest request;

int32_t niso_idb_cursor_get_request(niso_dom* dom, niso_handle self, niso_handle* out);

advance()

operation

undefined advance([EnforceRange] unsigned long count);

int32_t niso_idb_cursor_advance(niso_dom* dom, niso_handle self, uint32_t count);

continue()

operation

[NisoGlue] undefined continue(optional any key);

continuePrimaryKey()

operation

[NisoGlue] undefined continuePrimaryKey(any key, any primaryKey);

update()

operation

[NisoGlue, NewObject] IDBRequest update(any value);

delete()

operation

[NewObject] IDBRequest delete();

int32_t niso_idb_cursor_delete(niso_dom* dom, niso_handle self, niso_handle* out);

generation()

operation not in JS

[NisoInternal] unsigned long generation();

int32_t niso_idb_cursor_generation(niso_dom* dom, niso_handle self, uint32_t* out);

How many times the cursor’s key and value changed, and them.

currentKey()

operation not in JS

[NisoInternal] any currentKey();

int32_t niso_idb_cursor_current_key(niso_dom* dom, niso_handle self, niso_bytes* out);

currentPrimaryKey()

operation not in JS

[NisoInternal] any currentPrimaryKey();

int32_t niso_idb_cursor_current_primary_key(niso_dom* dom, niso_handle self, niso_bytes* out);

currentValue()

operation not in JS

[NisoInternal] any currentValue();

int32_t niso_idb_cursor_current_value(niso_dom* dom, niso_handle self, niso_bytes* out);

checkContinue()

operation not in JS

[NisoInternal] undefined checkContinue(boolean primary);

int32_t niso_idb_cursor_check_continue(niso_dom* dom, niso_handle self, bool primary);

continue’s (primary false) or continuePrimaryKey’s (true) checks before the keys are converted.

continueTo()

operation not in JS

[NisoInternal] undefined continueTo(any key, any primaryKey);

int32_t niso_idb_cursor_continue_to(niso_dom* dom, niso_handle self, const uint8_t* key, size_t key_len, const uint8_t* primary_key, size_t primary_key_len);

Their steps after; primaryKey is undefined for continue, and key too when not given.

checkUpdate()

operation not in JS

[NisoInternal] undefined checkUpdate();

int32_t niso_idb_cursor_check_update(niso_dom* dom, niso_handle self);

update’s checks before the value is cloned, and its steps after.

updateRecord()

operation not in JS

[NisoInternal] IDBRequest updateRecord(any value);

int32_t niso_idb_cursor_update_record(niso_dom* dom, niso_handle self, const uint8_t* value, size_t value_len, niso_handle* out);

Not in niso yet

Members the web has, by the BCD keys web-features 3.45.0 lists, that idl/ doesn’t declare. The list is partial: web-features lists only the keys it maps to a feature.

• worker_support (IndexedDB)