The universal Format Conversion API toolkit
Markdown, JSON, YAML, XML, CSV, TOML, Base64, units, Roman numerals, and more. 18 bidirectional conversion endpoints, one API key.
curl -X POST "https://convert.toolkitapi.io/v1/convert/json-to-csv" \
-H "X-API-Key: YOUR_KEY" \
-H "Content-Type: application/json" \
-d '{"json": [{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}]}'
import httpx
data = [
{"name": "Alice", "age": 30},
{"name": "Bob", "age": 25},
]
resp = httpx.post(
"https://convert.toolkitapi.io/v1/convert/json-to-csv",
headers={"X-API-Key": "YOUR_KEY"},
json={"json": data},
)
print(resp.json()["csv"])
# name,age\nAlice,30\nBob,25
const resp = await fetch("https://convert.toolkitapi.io/v1/convert/json-to-csv", {
method: "POST",
headers: {
"Content-Type": "application/json",
"X-API-Key": "YOUR_KEY",
},
body: JSON.stringify({
json: [{name: "Alice", age: 30}, {name: "Bob", age: 25}],
}),
});
const { csv } = await resp.json();
console.log(csv);
Browse by Category
Everything you need for format conversion, validation, and encoding.
Calendar & Contacts
5 toolsvCard and iCalendar (.ics) ↔ JSON for contacts and events.
Calendar Contact Conversion
0 toolsAuto-synced from API router category.
Data Formats
18 toolsJSON, XML, YAML, TOML, CSV — convert between any pair.
Data Conversion
0 toolsAuto-synced from API router category.
Documents
15 toolsPDF, DOCX, EPUB, HTML, presentations — document format conversions.
Document Conversion
0 toolsAuto-synced from API router category.
Formats
0 toolsAuto-synced from API router category.
Images
16 toolsPNG, JPEG, WebP, SVG, HEIC, ICO — raster and vector conversions.
Image Conversion
0 toolsAuto-synced from API router category.
Inbound To Json
0 toolsAuto-synced from API router category.
Json Out
0 toolsAuto-synced from API router category.
Markup Conversion
0 toolsAuto-synced from API router category.
Markup Text
0 toolsAuto-synced from API router category.
Media
4 toolsVideo and audio conversions, thumbnails, and media metadata.
Media Conversion
0 toolsAuto-synced from API router category.
Pdf Conversion
0 toolsAuto-synced from API router category.
Spreadsheets
7 toolsCSV ↔ Excel (.xlsx) ↔ JSON with sheet and delimiter control.
Spreadsheet Conversion
0 toolsAuto-synced from API router category.
Text & Markup
9 toolsMarkdown to HTML, HTML to text, and other markup conversions.
Built for Developers
Designed to simplify your workflow, not complicate it.
Bidirectional
Convert in both directions — JSON ↔ YAML, Markdown ↔ HTML, CSV ↔ JSON.
One API Key
18 conversion endpoints under a single subscription. No per-format pricing.
Instant Conversion
Pure compute, no file uploads, no queues. Results in milliseconds.
Start converting formats in minutes
One API key. 18 endpoints. JSON, CSV, XML, YAML, TOML, Markdown, HTML, and more.
Get Free API Key →