KV bulk import aborts with 'Error: KV bulk import failed: invalid line format at line 42'

When restoring a Cloudflare Workers KV namespace from a bulk export file, the wrangler kv:bulk import command stops processing as soon as it encounters a line that does not conform to the JSONL format, emitting an error such as Error: KV bulk import failed: invalid line format at line 42. This behavior can leave the target namespace with only a subset of the original keys, requiring manual cleanup or a full re‑import after correcting the source file.

The current workflow does not provide a built‑in mechanism to skip or isolate malformed lines, nor does it report all problematic lines in a single run. Administrators must therefore decide whether to pre‑validate the export file, to modify the import process to tolerate errors, or to accept the risk of partial restores and handle the aftermath manually.

What validation steps should be taken before importing a KV bulk export to guarantee line‑format correctness? Should the import command be adjusted to skip invalid lines and continue, or to collect and report all errors before aborting? How can a partially restored namespace be safely cleaned up without manual inspection of each key?