JSON API

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. Deprecated, removal in 0.12.0 (use mode instead)
nl.mode	0 to 3	Nightlight mode (0: instant, 1: fade, 2: color fade, 3: sunrise) (available since 0.10.2)
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.
lx	BBBGGGRRR: 0 - 100100100	Loxone RGB value for primary color. Each color (RRR,GGG,BBB) is specified in the range from 0 to 100%.
lx	20bbbtttt: 200002700 - 201006500	Loxone brightness and color temperature values for primary color. Brightness bbb is specified in the range 0 to 100%. tttt defines the color temperature in the range from 2700 to 6500 Kelvin.
ly	BBBGGGRRR: 0 - 100100100	Loxone RGB value for secondary color. Each color (RRR,GGG,BBB) is specified in the range from 0 to 100%.
ly	20bbbtttt: 200002700 - 201006500	Loxone brightness and color temperature values for secondary color. Brightness bbb is specified in the range 0 to 100%. tttt defines the color temperature in the range from 2700 to 6500 Kelvin.

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 is 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)
mi	bool	Mirrors the segment (available since 0.10.2)
i	Array	Individual LED control. Not included in state response (available since 0.10.2)

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.
str	bool	If true, an UI with only a single button for toggling sync should toggle receive+send, otherwise send only
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.
lm	string	Info about the realtime data source
lip	string	Realtime data source IP address
ws	-1 to 8	Number of currently connected WebSockets clients. -1 indicates that WS is unsupported in this build.
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.

Per-segment individual LED control

Using the i property of the segment object, you can set the LED colors in the segment using the JSON API. Keep in mind that this is non-persistent, if the light is turned off the segment will return to effect mode. The segment is blanked out when using individual control, the set effect will not run. To disable, change any property of the segment or turn off the light.

To set individual LEDs starting from the beginning, use an array of Color arrays.
{"seg":{"i":[[255,0,0], [0,255,0], [0,0,255]]}} will set the first LED red, the second green and the third blue.

To set individual LEDs, use the LED index followed by its Color array.
{"seg":{"i":[0,[255,0,0], 2,[0,255,0], 4,[0,0,255]]}} is the same as above, but leaves blank spaces between the lit LEDs.

To set ranges of LEDs, use the LED start and stop index followed by its Color array.
{"seg":{"i":[0,8,[255,0,0], 10,18,[0,0,255]]}} sets the first eight LEDs to red, leaves out two, and sets another 8 to blue.

Keep in mind that the LED indices are segment-based, so LED 0 is the first LED of the segment, not of the entire strip. Segment features, including Grouping, Spacing, Mirroring and Reverse are functional. This feature is available in build 200829 and above.