How to create a sensor for river level getting data from API vigicrue (France)

I’m trying to define a sensor to be updated every hour to get the river level close to my house. The source is an API providing a JSON output (,resultat_obs,continuite_obs_hydro).
I’m trying it by simply create a sensor:

- platform: rest
  name: River Deep
  scan_interval: 1200
  value_template: '{{ value_json.resultat_obs }}'
  unit_of_measurement: "m"

I’m not an expert on JSON! And this code is not returning anything.
Thanks in advance for your help

Welcome. I moved your post as this is a configuration question, not development.

Try this:

  value_template: "{{ value_json['data'][0]['resultat_obs'] }}"

I found it by pasting the json at the link you provided into the left side of this tool then drilling down to the required item on the right hand side:

Good job on formatting your pasted code correctly in your first post. I’ve lost count of the times I’ve had to ask a fist time poster to do this.

Hi Tom,

Thanks a lot for the correction and the tip.
you are a boss!
working fine now.

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here is the code for both height (m) and flow (m3/s) referred as H and Q in the API

  - platform: rest
    name: Loire Hauteur Orleans
    scan_interval: 1200
    value_template: "{{ ((value_json['data'][0]['resultat_obs']) | int / 1000 | round(3) ) }}" # mm en m
    unit_of_measurement: "m"

  - platform: rest
    name: Loire Débit Orleans
    scan_interval: 1200
    value_template: "{{ (((value_json['data'][0]['resultat_obs']) | int / 1000 ) | round ) }}" # l en m3/s
    unit_of_measurement: "m3/s"

remember you can search the station ID on

Don’t know if it’s easily possible to parse both answers simultaneously from this query:
API request H and Q, list 2

PS: my 1st post here :wave:

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Hi Pierrot,

This is my first post and my first faltering steps in the wonderful world of HA.
I would very much like to use this idea, but I’m struggling to replicate it.

Did you create this in a Sensor element in the Lovelace dashboard? When I create a sensor in the dashboard it picks up the following elements:

type: sensor
entity: sensor.0x00158d000638dd6c_hchp_cost

And then displays a value of 5.157800 EUR no matter what station ID I put into the YAML code.

What I would love to do is plot the values in a line graph, or even in a gauge, with thresholds for low, medium and high levels of the river. And trigger a notify automation when I’m getting close to red!

Sorry if this is a real newbie question. I’ve been reading the manual, promise!