Markdown table to JSON Lines API

Code examples

These examples send the sample as multipart/form-data and save the returned bytes unchanged. Set TABLECONVERT_API_KEY in your environment.

curl --fail-with-body --max-time 40 \
  'https://api.tableconvert.com/v2/convert/markdown-to-jsonlines' \
  --header "Authorization: Bearer $TABLECONVERT_API_KEY" \
  --form-string 'data=| event    | user  | timestamp  |
|----------|-------|------------|
| signup   | alice | 2026-10-30 |
| purchase | bob   | 2026-10-31 |
' \
  --form-string 'output[parsingJSON]=false' \
  --form-string 'output[format]=object' \
  --output 'markdown-to-jsonlines.jsonl'

import os
from pathlib import Path
import requests

endpoint = "https://api.tableconvert.com/v2/convert/markdown-to-jsonlines"
headers = {"Authorization": "Bearer " + os.environ["TABLECONVERT_API_KEY"]}
fields = {
    "data": (None, "| event    | user  | timestamp  |\n|----------|-------|------------|\n| signup   | alice | 2026-10-30 |\n| purchase | bob   | 2026-10-31 |\n"),
    "output[parsingJSON]": (None, "false"),
    "output[format]": (None, "object"),
}

response = requests.post(endpoint, headers=headers, files=fields, timeout=40)
response.raise_for_status()
Path("markdown-to-jsonlines.jsonl").write_bytes(response.content)

import { writeFile } from "node:fs/promises";

const form = new FormData();
form.set("data", "| event    | user  | timestamp  |\n|----------|-------|------------|\n| signup   | alice | 2026-10-30 |\n| purchase | bob   | 2026-10-31 |\n");
form.set("output[parsingJSON]", "false");
form.set("output[format]", "object");

const response = await fetch("https://api.tableconvert.com/v2/convert/markdown-to-jsonlines", {
  method: "POST",
  headers: { Authorization: "Bearer " + process.env.TABLECONVERT_API_KEY },
  body: form,
  signal: AbortSignal.timeout(40_000),
});
if (!response.ok) {
  throw new Error("HTTP " + response.status + ": " + await response.text());
}
await writeFile("markdown-to-jsonlines.jsonl", Buffer.from(await response.arrayBuffer()));

Request parameters

Pipe-delimited Markdown table rows become a rectangular dataset. The alignment separator row is removed rather than treated as data.

Send one source: data, file, or url. The examples below use the source mode appropriate for this format.

Output options

Generate newline-delimited JSON with one record or array per line. The output is JSONL text, not a single enclosing JSON array.

Conversion rules

How the input is read

• Supply the table itself; prose, fenced examples and unrelated document lines should be removed first.
• The parser removes a recognized second-row alignment separator and trims cell edges.
• Escaped pipes are distinguished from cell separators, but inline Markdown is not rendered to rich text.
• Use one physical row per record; prepare multiline cell content deliberately.

How the output is written

• Object mode uses the first row as property names and emits one object for each remaining row.
• Array mode includes table rows as JSON arrays; confirm whether the header belongs in your consumer.
• Use a line-oriented parser and review per-cell parsingJSON when preserving IDs and blanks.

When to use this API

Responses and errors

Check the response before retrying. A new HTTP request is a new conversion and may use credits again.

Limits, billing and versions

Local previews accept up to 200 KB. The current API implementation allows one uploaded file up to 50 MiB, limits each multipart text field to 1 MiB, and gives v2 conversion tasks a 30-second deadline. Deployment limits may be stricter. Read the returned error before retrying; some parser or renderer failures return HTTP 500.

Live calls follow the API credit policy. Failed conversions are refunded; a completed conversion is not undone if the download connection later fails.

References and format specifications

Format references explain the underlying syntax. The conversion rules and samples above describe TableConvert’s implementation.

• github.github.com
• jsonlines.org