> For the complete documentation index, see [llms.txt](/llms.txt).
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- dev
14 endpoints

# Dev API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Color
[
CMYK to Hex Converter cmyk-to-hex-converter
Convert CMYK percentages to RGB, HEX, HSL, HSV, and contrast text color.
1cr · v2026-04-22
](/tools/cmyk-to-hex-converter/) [
Hex to CMYK Converter hex-to-cmyk-converter
Convert a hex color to CMYK print percentages.
1cr · v2026-04-22
](/tools/hex-to-cmyk-converter/) [
Hex to RGB Converter hex-to-rgb-converter
Convert a hex color to RGB, HSL, CMYK, and contrast metrics.
1cr · v2026-04-22
](/tools/hex-to-rgb-converter/) [
RGB to Hex Converter rgb-to-hex-converter
Convert RGB channels to hex, HSL, HSV, CMYK, and relative luminance.
1cr · v2026-04-22
](/tools/rgb-to-hex-converter/)
Data Conversion
[
CSV to JSON Converter csv-to-json-converter
Convert CSV text to JSON with delimiter auto-detection and type inference.
1cr · v2026-04-22
](/tools/csv-to-json-converter/) [
JSON to CSV Converter json-to-csv-converter
Flatten a JSON array into CSV with auto-detected record path, dot or bracket key flattening, configurable delimiter, quoting, and line endings.
1cr · v2026-04-22
](/tools/json-to-csv-converter/)
Encoding
[
Base64 Decoder base64-decoder
Decode standard or URL-safe Base64 text and return byte and character analysis.
1cr · v2026-04-22
](/tools/base64-decoder/) [
Base64 Encoder base64-encoder
Encode UTF-8 text as standard, URL-safe, or MIME line-wrapped Base64.
1cr · v2026-04-22
](/tools/base64-encoder/) [
JWT Decoder jwt-decoder
Decode a JWT header and payload without verifying the signature, with registered claims and UTC claim times.
1cr · v2026-04-22
](/tools/jwt-decoder/) [
URL Decoder url-decoder
Decode percent-encoded URL text with optional plus-as-space handling and multi-layer detection.
1cr · v2026-04-22
](/tools/url-decoder/) [
URL Encoder url-encoder
Percent-encode text for URLs using RFC 3986, query-string, path, or full encoding modes.
1cr · v2026-04-22
](/tools/url-encoder/) [
URL Parser url-parser
Break a URL into scheme, host, port, path, decoded query parameters, and fragment.
1cr · v2026-04-22
](/tools/url-parser/)
Scheduling
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Cron Job Generator cron-job-generator
Generate a cron expression from common schedule presets.
1cr · v2026-04-22
](/tools/cron-job-generator/) [
Crontab Expression Generator crontab-expression-generator
Build and validate a crontab expression from individual fields.
1cr · v2026-04-22
](/tools/crontab-expression-generator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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