How it works
Add your JSON Lines / NDJSON file. MimiFile checks the format, converts it to CSV, and provides a temporary download when the result is ready.
Convert JSONL / NDJSON records to CSV when you need a spreadsheet-friendly or broadly importable table instead of newline-delimited JSON.
JSONL → CSV
Drag and drop, paste a file, or browse your device.
Files are temporary and deleted automatically.
Limits: 50 MB per file · 128 MB total per batch.
Add your JSON Lines / NDJSON file. MimiFile checks the format, converts it to CSV, and provides a temporary download when the result is ready.
CSV does not carry JSONL's typed or nested data model. MimiFile writes column headers and converts complex objects or arrays to compact JSON text in cells rather than inventing flattened column paths.
Current source limit : 50 MB per file. Up to 10 files can be submitted in a batch, subject to the global batch ceiling.
MimiFile reads newline-delimited JSON as tabular record batches, writes the detected column names as the CSV header and outputs one CSV row per converted record.
When a value is not a simple scalar, MimiFile serializes dictionaries and lists as compact JSON text in the cell. Binary values are represented as Base64 text and date/time values as ISO text where needed.
CSV has no rich typed schema. Review nulls, timestamps, nested values, delimiters and downstream type inference before loading the CSV into a spreadsheet, database or ETL system.
When a tabular destination cannot represent lists or objects directly, nested values are serialized as JSON text where supported instead of being silently discarded.
Nulls and timestamps are preserved when the destination supports them. Binary values can be represented as Base64 text in text-based or spreadsheet outputs.
Check column types, null values, timestamps and nested fields before using the converted file in a production data pipeline.