JSON to CSV Converter
Convert a JSON array of objects to CSV format. Headers are auto-detected from keys.
Convert JSON arrays to spreadsheet-ready CSV
Paste an array of JSON objects and convert it into a CSV file that opens in Excel, Google Sheets, Numbers, BI tools, and import pipelines. This is useful when an API returns structured JSON but the next person in the workflow needs rows and columns.
The converter detects headers from object keys, fills missing values with empty cells, and escapes commas, quotes, and newlines so the CSV remains readable in spreadsheet software.
Prepare API data before sharing it
JSON to CSV is a common handoff step for product analytics, database exports, webhook payloads, CRM records, and support investigations. Instead of writing a one-off script, paste the array, inspect the generated headers, and export the result for non-technical teammates.
If the JSON is minified or hard to scan, format it first. If the file fails to parse, validate it before converting so syntax issues do not become silent spreadsheet problems.
Private browser-side conversion
The conversion runs in your browser. FastDevTool does not upload your JSON to a server, does not store the generated CSV, and does not require an account.
That local design is helpful for internal API responses, draft exports, customer-support snippets, and data samples that should not leave your machine. Remove secrets before sharing the exported CSV with anyone else.
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Frequently Asked Questions
What JSON structure can be converted to CSV?
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CSV format requires tabular data. The converter expects a JSON array of objects where each object has the same keys. The keys become CSV column headers and each object becomes a row.
What if objects have different keys?
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The converter collects all unique keys from all objects to build the headers. Missing values for any key are left as empty fields.
Can I convert API responses with nested JSON?
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Yes. For the cleanest CSV, start with an array of similarly shaped objects. If the API response wraps the array inside a field such as data or results, copy that array first or format it in JSON Formatter before converting.
Are numbers preserved correctly?
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Yes. Numeric values in JSON are written as numbers in CSV without quotes. String values are quoted if they contain commas or quotes.
Can I use the CSV in Excel?
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Yes. The exported CSV file is compatible with Excel, Google Sheets, and other spreadsheet applications.
Is my JSON uploaded to FastDevTool?
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No. Conversion runs locally in your browser. FastDevTool does not upload your JSON, store your rows, or send the generated CSV to a backend.