How do you delete all nodes in neo4j?

To delete all nodes in the Neo4j database, you can use the `MATCH` and `DETACH DELETE` clauses in the Cypher query language.

Here is an example code for removing all nodes.

MATCH (n)
DETACH DELETE n;

This query will match all nodes in the database and delete them along with their relationships and properties.

Please be aware that executing this query will permanently delete all node data in the database, please proceed with caution. It is recommended to back up the data or confirm that the operation will not result in irrecoverable data loss before proceeding.