Safer JSON Snapshot Updates Use a Temporary File Before Replacement

A technical write-up describes how a small local job can avoid corrupting its saved JSON state. Opening the destination file directly erases the prior result before serialization completes, so a mid-write failure can leave readers with a partial snapshot. The proposed approach writes to a temporary file in the same directory, flushes and syncs it, then replaces the original. Three local tests on synthetic files confirmed that successful writes, serialization errors, and replacement failures all leave the previous data intact. The author notes the helper lacks version checks or a writer lock, so concurrent writers could still overwrite each other.