The Neo4j JavaScript driver's session object has a readTransaction method that you can use for marking read queries explicitly.

For Version 4 of the driver, the below example using the readTransaction function is correct:

var movieName = 'matrix'
const readQuery = `MATCH (p:Person)-[:ACTED_IN]->(m)\
       WHERE toLower(m.title) CONTAINS toLower($title) \
       RETURN DISTINCT p.name as actorsTx`
const readResult = await session.readTransaction(tx =>
       tx.run(readQuery, { title: movieName })
)
readResult.records.forEach(record => {
       console.log(`Found actor: ${record.get('actorsTx')}`)
})

For Version 5 of the driver, you need to use the executeRead function instead:

var movieName = 'matrix'
const readQuery = `MATCH (p:Person)-[:ACTED_IN]->(m)\
       WHERE toLower(m.title) CONTAINS toLower($title) \
       RETURN DISTINCT p.name as actorsTx`
const readResult = await session.executeRead(tx =>
       tx.run(readQuery, { title: movieName })
)
readResult.records.forEach(record => {
       console.log(`Found actor: ${record.get('actorsTx')}`)
})