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fastapi.online JSON to CSV Converter
x402
fastapi.online JSON to CSV Converter is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).
Converts an array of JSON objects into a CSV-formatted string, with optional column ordering and custom delimiter.
Price / call$0.0005
Success—
StatusUnknown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.
Output
Returns a CSV-formatted string where each JSON object becomes a row, columns are ordered as specified (or derived from keys), and fields are separated by the chosen delimiter (default comma). The first line is the header row with column names.
Example use cases
Export analytics results as CSV
“I have a JSON array of weekly analytics rows like [{"week":"2024-01","visits":1200,"conversions":45},...] — can you convert it to CSV with columns week, visits, conversions so I can open it in Excel?”
Pipe-delimited data for legacy system
“Take these JSON records and turn them into a pipe-delimited CSV with columns product_id, sku, price — the system I'm uploading to doesn't accept commas as delimiters.”
Reorder columns for reporting template
“Convert my JSON user records to CSV but make sure the columns appear in this exact order: last_name, first_name, email, signup_date — the reporting template requires that specific layout.”
Technical details
Endpoint
POSThttps://api.fastapi.online/json-to-csvWhen to prefer
Use this endpoint when you need a quick, serverless, pay-per-call JSON-to-CSV conversion without setting up a local library or managing dependencies. Ideal for agents that receive JSON data and need to export it as a spreadsheet-compatible format on the fly. At $0.0005 per call it is cost-effective for occasional conversions. Prefer a local library (e.g. Python csv module) for high-volume or sensitive data that shouldn't leave your environment.
Side effects
- Missing or empty rows array returns an error or empty CSV
- Invalid delimiter (more than one character) is rejected
- Rows with inconsistent keys may produce empty cells for missing fields
- Malformed JSON in the request body returns a 400/422 validation error
- Payment not included or insufficient USDC triggers a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| rows | array | |
| columns | array | |
| delimiter | string |
Tags
x402
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