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fastapi.online CSV to JSON Converter
x402
fastapi.online CSV to JSON Converter is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-14).
Converts CSV text into JSON format, with configurable delimiter and optional header row handling
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
A JSON representation of the CSV data — typically a JSON array of objects (when headers are present) where each row becomes an object with header names as keys, or a JSON array of arrays (when no header row) representing raw row values.
Example use cases
API payload preparation from spreadsheet export
“I exported a report from Excel as CSV and I need it as a JSON array so I can POST it to our internal API — the CSV uses commas and has a header row. Here it is: 'id,product,revenue\n1,Widget A,500\n2,Widget B,320'”
Tab-delimited data pipeline ingestion
“Can you turn this tab-delimited data into JSON? There's no header row, just raw values: 'foo\t42\ttrue\nbar\t17\tfalse'”
Semicolon-separated European CSV normalization
“I have a CSV from a European system that uses semicolons as delimiters and includes a header row — convert it to JSON please: 'vorname;nachname;alter\nHans;Müller;45\nAnna;Schmidt;32'”
Technical details
Endpoint
POSThttps://api.fastapi.online/csv-to-jsonWhen to prefer
Choose this endpoint when you need a simple, low-cost ($0.0005 USDC), no-signup CSV-to-JSON conversion via a pay-per-call API. Ideal for agents that need to transform small-to-medium CSV payloads on demand without standing up infrastructure or managing API keys. Best for well-formed CSV strings with known delimiters.
Side effects
- Malformed CSV (unclosed quotes, inconsistent column counts) may return a parse error
- Delimiter character mismatch causes columns to not be split correctly
- Exceeding the 200,000 character input limit returns a validation error
- Empty CSV string (minLength:1 violated) returns a 422 validation error
- Payment not sent or insufficient USDC results in 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| csv | string | |
| delimiter | string | |
| has_header | boolean |
Tags
x402
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