2020-06-07 00:20:31 +02:00

9.7 KiB

Starting from version 0.8.4, WLED implements a powerful JSON API over HTTP. It is accessible using the /json subpage.

Obtaining light information

Sending a GET request will return an object similar to the sample below. The response consists of four objects:

  • state contains the current state of the light. All values may be modified by the client (see below)
  • info contains general information about the device. No value can be modified using this API.
  • effects contains an array of the effect mode names
  • palettes contains an array of the palette names

You may also obtain those objects individually using the URLs /json/state /json/info /json/eff, and /json/pal

Setting new values

Sending a POST request to /json or /json/state with (parts of) the state object will update the respective values. Example: {"on":true,"bri":255} sets the brightness to maximum. {"seg":[{"col":[[0,255,200]]}]} sets the color of the first segment to teal.

Sample JSON API response (v0.8.4):

  "state": {
    "on": true,
    "bri": 127,
    "transition": 7,
    "ps": -1,
    "pl": -1,
    "nl": {
      "on": false,
      "dur": 60,
      "fade": true,
      "tbri": 0
    "udpn": {
      "send": false,
      "recv": true
    "seg": [{
      "start": 0,
      "stop": 20,
      "len": 20,
      "col": [
        [255, 160, 0, 0],
        [0, 0, 0, 0],
        [0, 0, 0, 0]
      "fx": 0,
      "sx": 127,
      "ix": 127,
      "pal": 0,
      "sel": true,
      "rev": false,
      "cln": -1
  "info": {
    "ver": "0.8.4",
    "vid": 1903252,
    "leds": {
      "count": 20,
      "rgbw": true,
      "pin": [2],
      "pwr": 0,
      "maxpwr": 65000,
      "maxseg": 1
    "name": "WLED Light",
    "udpport": 21324,
    "live": false,
    "fxcount": 80,
    "palcount": 47,
    "arch": "esp8266",
    "core": "2_4_2",
    "freeheap": 13264,
    "uptime": 17985,
    "opt": 127,
    "brand": "WLED",
    "product": "DIY light",
    "btype": "src",
    "mac": "60019423b441"
  "effects": [
    "Solid", "Blink", "Breathe", "Wipe", "Wipe Random", "Random Colors", "Sweep", "Dynamic", "Colorloop", "Rainbow",
    "Scan", "Dual Scan", "Fade", "Chase", "Chase Rainbow", "Running", "Saw", "Twinkle", "Dissolve", "Dissolve Rnd",
    "Sparkle", "Dark Sparkle", "Sparkle+", "Strobe", "Strobe Rainbow", "Mega Strobe", "Blink Rainbow", "Android", "Chase", "Chase Random",
    "Chase Rainbow", "Chase Flash", "Chase Flash Rnd", "Rainbow Runner", "Colorful", "Traffic Light", "Sweep Random", "Running 2", "Red & Blue", "Stream",
    "Scanner", "Lighthouse", "Fireworks", "Rain", "Merry Christmas", "Fire Flicker", "Gradient", "Loading", "In Out", "In In",
    "Out Out", "Out In", "Circus", "Halloween", "Tri Chase", "Tri Wipe", "Tri Fade", "Lightning", "ICU", "Multi Comet",
    "Dual Scanner", "Stream 2", "Oscillate", "Pride 2015", "Juggle", "Palette", "Fire 2012", "Colorwaves", "BPM", "Fill Noise", "Noise 1",
    "Noise 2", "Noise 3", "Noise 4", "Colortwinkle", "Lake", "Meteor", "Smooth Meteor", "Railway", "Ripple"
  "palettes": [
    "Default", "Random Cycle", "Primary Color", "Based on Primary", "Set Colors", "Based on Set", "Party", "Cloud", "Lava", "Ocean",
    "Forest", "Rainbow", "Rainbow Bands", "Sunset", "Rivendell", "Breeze", "Red & Blue", "Yellowout", "Analogous", "Splash",
    "Pastel", "Sunset 2", "Beech", "Vintage", "Departure", "Landscape", "Beach", "Sherbet", "Hult", "Hult 64",
    "Drywet", "Jul", "Grintage", "Rewhi", "Tertiary", "Fire", "Icefire", "Cyane", "Light Pink", "Autumn",
    "Magenta", "Magred", "Yelmag", "Yelblu", "Orange & Teal", "Tiamat", "April Night"

Overview of values

State object

JSON key Value range Description
on bool On/Off state of the light
bri 0 to 255 Brightness of the light. If on is false, contains last brightness when light was on (aka brightness when on is set to true). Setting bri to 0 is supported but it is recommended to use the range 1-255 and use on: false to turn off. The state response will never have the value 0 for bri.
transition 0 to 255 Duration of the crossfade between different colors/brightness levels. One unit is 100ms, so a value of 4 results in a transition of 400ms.
tt 0 to 255 Similar to transition, but applies to just the current API call. Not included in state response.
ps -1 to 65535 ID of currently set preset.
psave 1 to 16 Save current light config to specified preset slot. Not included in state response.
pl -1 to 0 ID of currently set playlist. For now, this sets the preset cycle feature, -1 is off and 0 is on.
nl.on bool Nightlight currently active
nl.dur 1 to 255 Duration of nightlight in minutes
nl.fade bool If true, the light will gradually dim over the course of the nightlight duration. If false, it will instantly turn to the target brightness once the duration has elapsed.
nl.tbri 0 to 255 Target brightness of nightlight feature
udpn.send bool Send WLED broadcast (UDP sync) packet on state change
udpn.recv bool Receive broadcast packets
udpn.nn bool Don't send a broadcast packet (applies to just the current API call). Not included in state response.
v bool If set to true in a JSON POST command, the response will contain the full JSON state object. Not included in state response.
lor 0, 1, or 2 Live data override. 0 is off, 1 is override until live data ends, 2 is override until ESP reboot (available since 0.10.0)
time uint32 Set module time to unix timestamp. Not included in state response.
mainseg 0 to info.leds.maxseg-1 Main Segment
seg Array of segment objects Segments are individual parts of the LED strip. In 0.9.0 this will enables running different effects on different parts of the strip.

Contents of the segment object

Notice: start, stop, and len are not changeable in 0.8.4. Any segment with id > 0 is ignored. Unless stated otherwise, every value may be changed via an HTTP POST request. The tertiary color is not gamma-corrected in 0.8.4, but will be in subsequent releases.

JSON key Value range Description
id 0 to info.maxseg -1 Zero-indexed ID of the segment. May be omitted, in that case the ID will be inferred from the order of the segment objects in the seg array. As such, not included in state response.
start 0 to info.leds.count -1 LED the segment starts at.
stop 0 to info.leds.count LED the segment stops at, not included in range. If stop is set to a lower or equal value than start (setting to 0 is recommended), the segment is invalidated and deleted.
len 0 to info.leds.count Length of the segment (stop - start). stop has preference, so if it is included, len is ignored.
col Array of colors Array that has up to 3 color arrays as elements, the primary, secondary (background) and tertiary colors of the segment. Each color is an array of 3 or 4 bytes, which represent an RGB(W) color.
fx 0 to info.fxcount -1 ID of the effect.
sx 0 to 255 Relative effect speed
ix 0 to 255 Effect intensity
pal 0 to info.palcount -1 ID of the color palette
sel bool true if the segment is selected. Selected segments will have their state (color/FX) updated by APIs that don't support segments (currently any API except this JSON API). If no segment is selected, the first segment (id:0) will behave as if selected. WLED will report the state of the first (lowest id) segment that is selected to APIs (UDP sync, HTTP, MQTT, Blynk...).
rev bool Flips the segment, causing animations to change direction.
on bool Turns on and off the individual segment. (available since 0.10.0)
bri 0 to 255 Sets the individual segment brightness (available since 0.10.0)

Info object

No value may be changed by means of this API.

JSON key Value range Description
ver string Version name.
vid uint32 Build ID (YYMMDDB, B = daily build index).
leds.count 1 to 1200 Total LED count.
leds.rgbw bool true if LEDs are 4-channel (RGBW).
leds.pin byte array LED strip pin(s). In 0.8.4, always one element.
leds.pwr 0 to 65000 Current LED power usage in milliamps as determined by the ABL. 0 if ABL is disabled.
leds.maxpwr 0 to 65000 Maximum power budget in milliamps for the ABL. 0 if ABL is disabled.
leds.maxseg byte Maximum number of segments supported by this version.
name string Friendly name of the light. Intended for display in lists and titles.
udpport uint16 The UDP port for realtime packets and WLED broadcast.
live bool If true, the software is currently receiving realtime data via UDP or E1.31.
fxcount byte Number of effects included.
palcount uint16 Number of palettes configured.
wifi.bssid string The BSSID of the currently connected network.
wifi.signal 0 to 100 Relative signal quality of the current connection.
wifi.channel 1 to 14 The current WiFi channel.
arch string Name of the platform.
core string Version of the underlying (Arduino core) SDK.
freeheap uint32 Bytes of heap memory (RAM) currently available. Problematic if <10k.
uptime uint32 Time since the last boot/reset in seconds.
opt uint16 Used for debugging purposes only.
brand string The producer/vendor of the light. Always WLED for standard installations.
product string The product name. Always DIY light for standard installations.
btype string The origin of the build. src if a release version is compiled from source, bin for an official release image, dev for a development build (regardless of src/bin origin) and exp for experimental versions. ogn if the image is flashed to hardware by the vendor.
mac string The hexadecimal hardware MAC address of the light, lowercase and without colons.