JSON to CSV Converter

How to Convert JSON & JSONL to CSV Spreadsheets

1. Paste or Upload Your Data: Paste raw JSON (an array of objects) or line-by-line JSONL data into the input panel. You can also upload a .json or .csv file.
2. Choose Delimiter and Flattening: Check Flatten nested objects to expand child objects into clean dot-notation columns (e.g., customer.address.city). Select Comma (,), Semicolon (;), or Tab (\t).
3. Convert with One Click: Click Convert to CSV to generate formatted spreadsheet rows in milliseconds.
4. Preview as a Grid or Raw Code: Toggle between Raw CSV and Table View to inspect columns, headers, and data rows directly in your browser.
5. Reverse to JSON: Need to turn a spreadsheet back into code? Click Switch to CSV → JSON to parse CSV rows into a validated JSON object array.
6. Copy or Export: Click Copy to copy the output to your clipboard, or Download to save it as converted.csv.

Handling Nested JSON, Arrays, and JSONL Log Streams

Real-world APIs rarely return flat two-dimensional structures. Most databases (MongoDB, PostgreSQL JSONB, Firestore) output nested child records and JSONL streams. When extracting raw data from relational databases, format your query with our online SQL query formatter to structure your output columns cleanly. Here is how our converter manages complex payloads:

• Recursive Object Flattening: Deeply nested properties are converted into dot-separated headers (for example, user.billing.zipCode), keeping spreadsheet rows aligned without data truncation.
• JSONL (Newline-Delimited JSON): Popular with log aggregators (Datadog, Elastic, CloudWatch) and LLM datasets. The converter streams each line independently, allowing massive log dumps to be analyzed in Excel.
• Sparse & Mismatched Schemas: If certain records in your array omit fields that others include, the converter creates unified column headers across all objects and leaves missing fields as clean blanks.
• Special Character Escaping: Strings containing commas, line breaks, or double quotes are automatically quoted according to RFC 4180 rules, preventing broken rows in Microsoft Excel or Google Sheets.

Why Perform JSON to CSV Conversion in Your Browser?

• Privacy and Zero Server Retention: Customer databases, financial records, and medical API payloads are strictly processed inside client-side Web Workers. No data is stored or logged.
• Instant Excel & BI Tool Import: CSV remains the fastest, most universal format for loading semi-structured JSON data into Excel, Google Sheets, Tableau, and PowerBI.
• No File Size Throttles or Paywalls: Unlike SaaS converters that enforce 5MB limits or demand a credit card, our client-side engine parses large files directly using your device's available memory.