GET

/v1/schemas/fal/video/kling/v4/flash/text-to-video

kind inputactivity videohash 621d3dfa…extracted Nov 5, 2026version currentsource upstream spec ↗
fieldrecorded source
schemaSource linked above.

upstream-spec

Source trace
78bea25919fd721a63a7e8edbaa2dd280bc08addbd59a7fee5fe0a9c995ae1a6
{
  "fetchedAt": 1793854802,
  "extractorVersion": "1",
  "verifiedAt": null
}

Request body

4 properties · 1 required · 0 $defs
propertytypedescriptionconstraints
prompt*stringText prompt for video generation.length ≤ 26000
resolutionenumOutput resolution. Flash is 720p only.720p · default: "720p"
durationintegerVideo duration in seconds (3-20).3 ≤ n ≤ 20 · default: 5
aspect_ratioenumAspect ratio of the generated video.16:9 | 9:16 | 1:1 | 21:9 · default: "16:9"

Validate a payload

before you spend tokens
shell
$ curl -X POST https://modelschemas.com/v1/validate \
    -d '{"provider":"fal","endpointId":"kling/v4/flash/text-to-video","payload":{…}}'
→ {"valid": false, "errors": [{"path": "#", "keyword": "required", …}]}