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JSON to CSV Converter
x402
JSON to CSV Converter is a paid API for AI agents from toolbelt402.tpoborne.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Converts an array of JSON objects into a CSV string, with column union across rows or explicit column ordering, stringifying nested values into cells.
Price / call$0.002
Success—
StatusUnknown
How this service works
Convert an array of JSON objects into CSV — column union across rows or explicit column order; nested values are JSON-stringified into cells.
Output
A plain-text CSV string with a header row derived from either the union of all keys across input objects or an explicit column list. Each subsequent row corresponds to one JSON object; nested objects or arrays are JSON-stringified into their cell rather than expanded. Missing keys for a given row produce empty cells.
Example use cases
Export API data for spreadsheet
“I've got a JSON array of customer records from our CRM API and I need to export it as a CSV so the team can open it in Excel. The columns should be in this order: customer_id, full_name, email, plan, mrr. Any nested objects should just be stringified.”
Pipeline data hand-off between services
“Our data pipeline outputs a big JSON array of order events and the next stage needs a CSV. Can you convert this JSON array to CSV, letting the columns be inferred automatically by taking the union across all rows?”
Generate CSV report from mixed-schema records
“I have a list of JSON log entries where not every row has the same keys — some have an 'error' field, others don't. Convert them all to a single CSV using column union so every field appears as a header and missing values are left blank.”
Technical details
Endpoint
POSThttps://toolbelt402.tpoborne.workers.dev/json/to-csvWhen to prefer
Use this endpoint when you have an in-memory JSON array of objects that needs to become a flat CSV — especially when rows may have heterogeneous keys (column union) or when you need a guaranteed column order. Prefer this over client-side transformation when working in an agent pipeline that lacks a native CSV library, or when you want nested values auto-stringified without extra logic.
Side effects
- Input is not a valid JSON array — returns a 4xx error
- Input array contains non-object elements (e.g. primitives) — may produce malformed rows
- Explicit column list references columns not present in any row — those columns appear with all empty values
- Very large payloads may hit Cloudflare Worker size or timeout limits
- Malformed JSON body returns a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| rows | array | Array of objects; column union across rows |
| options | object |
Tags
x402
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