Terraform get value from list of maps. index)}" .

Terraform get value from list of maps. The lookup function retrieves an element value from a map given its key. Managing Lists and Maps in YAML for Terraform YAML’s real power shines when handling complex data structures like lists and maps. How can I make the list of tuples into list of maps for the foreach to work ? Aug 20, 2020 · This is the nearest what I have found - Map within a map in terraform variables where I can read the value in a nested map but I need to extract key also in my case. Terraform types and Terraform variables are used to build clean and robust Terraform code as they validate the user-provided values for the input variables, output variables, and resources. I've tried using the jsondecode but getting errors. This guide will walk you Feb 3, 2024 · Overview In this comprehensive guide, we’ll dive deep into using maps in Terraform, from the basics to advanced applications. Use the `concat` function to join the keys of a map into a single string. locals { aws_bucket_names = { "name1" = "bucket1", "name2" = "bucket2", "name3" = "bucket3" } bucket_name_list = [for name, _ in local. aws_e… Aug 9, 2022 · Terraform - Get a value from map output Asked 3 years ago Modified 3 years ago Viewed 5k times May 22, 2020 · I am trying to output values for an object which is a combination of a map and list. for example aws_subn Oct 30, 2024 · Terraform map variable helps with managing your configuration using key-value pairs, allowing you to easily handle different environments or regions without repeating your code. Explicit type conversions are rarely necessary in Terraform because it will convert types automatically where required. Terraform also converts this index number to a string, as maps use strings as keys. Your input variable would ideally be named iam_policy_users_map instead, and likewise your output value be association_map. Steps Define Your List: Aug 27, 2020 · I want to get a specific map element from a lists of maps in Terraform's output. This article will guide you through the process of using variables as keys in Terraform maps, enabling greater flexibility in your infrastructure as code. Otherwise, it returns the default value. fr" } "mydomain1. The `get_value_from_map` function is specifically designed for getting values from maps, and it is more efficient than the `get_value_from_list` function. Terraform makes several kinds of named values available. This may be a single value, or multiple items, and I want them all contained within a single NSG rule. Maps are particularly useful when dealing with complex infrastructures, as they enable you to define Mar 4, 2024 · What is a Terraform Map? It helps to understand how Terraform defines the concept of a map before you learn about the lookup function. tomap converts its argument to a map value. Aug 31, 2018 · 12 You can't nested multiple levels of square brackets to get n levels inside a data structure. Let’s take a few examples of that If you want to create a list of keys, or values from a map. It receives a variable which is of type Map (of strings), and it sends back to the caller the value of the Country property in that Map. This article will guide you through the problem and its solution using Terraform’s for loop and local variables. Learn about value types and syntax, including string, number, bool, list, and map. This Terraform tutorial will show you how to use for_each to dynamically create resources, and how to use the for_each variable in other Terraform configuration blocks. Assuming we have an input map like before, but you want to include values that contain ‘apple’ or ‘banana’. This post shows you when and how to use them effectively, complete with real-world examples for loops, conditionals, and module configurations. In this example, Terraform assigns the first list object jeffbrowntech001 to index “0”. Feb 11, 2021 · Hi @janapb, It seems like your first and third object are totally identical and so there isn’t any way to distinguish them with just the information given here. However you can use the interpolation functions to retrieve such values. Here is the data source (as seen by terraform state show data. See examples. Nov 14, 2019 · Thanks @salaxander! We can generalize that solution to work for any number of appgw_dns_records elements by using a for expression: [for r in local. Use the explicit type conversion functions only to normalize types returned in module outputs. The output will be a combination of policy’s and all its values. For each of these, I need to call a module with the id as input1 and several other settings. This can be achieved efficiently using a combination of the for expression and the splat operator ([*]). Learn how to use the Terraform element function to select an element from a collection of values. In this blog, we’ll cover what Terraform maps are, explore their use cases, and provide some practical examples. private_subnets[*]. Learn how to use Terraform map variables, convert lists to maps, apply functions like tomap and flatten, and define maps by type and value. 3. I know to get a value from a map given a key is easy, we just have to use lookup function or square brackets with key as input. In this case, that means you need a map with one element per workspace per variable, because tfe_variable describes a single variable on a single workspace. Jun 17, 2025 · Terraform gives you powerful tools to handle dynamic infrastructure at scale — but only if you use its data types right. module "a" { for_each = toset (local. value data. Jan 29, 2025 · In Terraform, maps (or dictionaries) are collections of key-value pairs where keys are unique, and values can be strings, numbers, lists, or other types. Below is my code :- variables. json for each map item and print a list as output conditionall Oct 29, 2019 · Yes this is possible, you need to use the for expression in Terraform to achieve this though, the for loop converts the list of objects into a value in which Terraform can loop over using for_each, without the for expression, Terraform cannot loop over the list of objects because there is no key value for Terraform to reference. You can use them as standalone expressions, or combine them with other expressions to compute new values. This blog post will guide you through the process of using foreach with nested collections in Terraform. Sep 8, 2021 · I can get the key and value from the map no problem, but when trying to pick an availability zone I can't find how to change the value. I need a unique numerical index for each rule number. Oct 30, 2024 · Discover how to use Terraform merge function with the step-by-step guide includes code examples and practical scenarios to help you simplify configurations. Get value from map terraform: Learn how to get the value of a map in Terraform with Terraform's built-in functions. Feb 3, 2024 · Introduction When managing infrastructure as code with Terraform, you often need to organize data in a way that supports dynamic configurations. Jan 29, 2021 · 0 In order to filter a list of maps using a specific key value. Jul 28, 2020 · If you’re referencing values in the map by their key, rather than an “index” you’ll always get your expected value, and you can add/remove items from the map without forcing a new resource. Back in root module, main. aws_bucket_names : name] } output "bucket May 18, 2020 · The other thing we need to take care of is that when we convert this to a map we need to make sure all of the elements have unique keys, which requires including both the group and sev values in the key strings. value Am I somehow implementing worst pratices by organizing data as a map of maps? Is Terraform/HCL not well equipped to wrangle nested data structures? Thanks in advance. Something like this. When I’m reading this post you’ve linked to, this line: peer_vpc_id = "${element(values(var. 12 object in a named local value can in principle be replaced with a separate simple map of local value for each object attribute, using a common set of keys in each map. Use the `index` function to get the value of a specific key. An object has the following structure: myObject = { "unknownRandomKey" : {"id": &quot Jun 11, 2021 · The easiest way to experiment with terraform console is to use it from in the directory of an existing configuration. Oct 5, 2024 · Learn how to access the index of elements within a Terraform for_each loop to efficiently manage and reference your infrastructure resources. Replace the file name in the main. After deploying the configuration, view the state file contents using the terraform state list Feb 1, 2022 · I want to read a list of objects from a yaml file via terraform code and map it to a local variable. Jan 26, 2024 · In Terraform, you can use list and map variables to define dynamic sets of values within your configuration. Related Functions index finds the index for a particular element value. Each of these names is an expression that references the associated value. Oct 7, 2024 · Introduction In Terraform, locating a specific object within a list of objects is a common task. 12. apples_account_vpc_ids),count. tf The values function returns a list of the element values in a given map. Lists are often used to define input variables, output values, and resource configurations. Nov 3, 2019 · Since this regions_config variable works with objects of a particular structure, I recommend declaring it as a set of objects rather than a set of maps, because then Terraform can check that all of the attributes are present and have suitably-typed values: Learn how to use the Terraform length function to determine the length of a given list, map, or string. Terraform, an Infrastructure as Code (IaC) tool, is widely used to manage and provision cloud resources efficiently. *. Nov 25, 2022 · The given "for_each" argument value is unsuitable: the "for_each" argument must be a map, or set of strings, and you have provided a value of type list of object. Assuming that you mean "get all of the map keys where the value is literally "a" ", you can do that with a for expression including an if clause: [ for k, v in local. project_user value -- which is a list with an element for each project/user pair -- often ends up being useful when declaring resources that represent those pairings. Also i need search an object with a key and get the values from a yaml file. fr_alice" = { "a_record" = "alice" "domain" = "mydomain1. May 10, 2017 · If resources use a count parameter to specify multi resources in terraform there is a simple syntax for providing a list/array of dedicated fields for the resource instances. Apr 18, 2024 · What this is doing is creating a map containing a maps of objects (given the above inputs) where each map item has a ‘composite’ key, composed of the domain and the a_record, and each map value contains an object with a_record and domain properties: { "mydomain1. But still you can use if condition to filter map or list of objects to get the required keys or values. It considers the map variable’s name to retrieve the key and default values. tf Nov 21, 2022 · As Terraform visits each element in the list, it sets the index or key to the element order in the list, starting at 0. Apr 25, 2021 · merge(local. That gives you access to the existing values from the config. You want to create a map where each property name is a key, and the value is an object defining that property’s type. appgw_dns_records : "${r. Get the keys of a map in Terraform 1. In this blog post, we discussed how to get the value of a Terraform list using the `get_value` function. May 20, 2020 · The main requirement to keep in mind for for_each is that we always need to create a map that has one element for each instance of the resource we want to create. The for_each expression In Terraform, the for_each expression allows you to iterate over a list or map and create multiple instances of a resource or module based on the elements of that list or map. Oct 9, 2024 · Introduction In Terraform, while you can't directly use variables as keys within a map definition, there's a powerful workaround: dynamically constructing maps. Use the `keys` function to get a list of all the keys in the map. In the example, I can see that they are targeting a list of strings to remove any duplicate. In some scenarios, you might need to transform a list of strings into a map of objects for your Terraform configurations. Apr 15, 2022 · i have map variable (below), and i need to do actions on names, to remove ‘_data-green’ and ‘_data_blue’ and then remove duplicates to have for example only list variable with items: “api-1”, “api-2” locals { apps = { … This allows your map to contain any structure and types you want, and then you can enforce required values by setting try statements on the destination resources where these values will apply if present or be null if not Dec 20, 2023 · Taking a closer look at how Terraform uses object keys, and using it to build an better understand of resource references in state files and configurations. This article demonstrates how to achieve this using a combination of the for expression and the index function, allowing you to efficiently search and extract desired objects based on specific criteria. Aug 15, 2019 · If you are using Terraform 0. The Terraform lookup function is a built-in function that retrieves the values from a map variable or a list of objects. Maps, or key-value pairs in Terraform, play a crucial role in managing complex infrastructure Learn how to get the keys of a map in Terraform with this step-by-step guide. Aug 12, 2024 · What is Terraform Lookup Function The Terraform lookup function is used to retrieve a specific value from a Terraform map based on a particular key. Dec 22, 2024 · Learn how to effectively structure complex data in Terraform configurations by using maps with both string and nested map elements. In below example I have scenari Hands-on: Try the Create Dynamic Expressions tutorial. I would like to achieve somewhat the same, on a list of objects, in the following way: Type: list (object) Input: { "Property1" = "A" "Property2" = "B" }, { "Property1" = "C" "Property2" = "D" }, { "Property1" = "F" "Property2" = "B The tomap function converts a value to a map. Apr 6, 2020 · The following and variations of it are all invalid: data. Our job then is to write an expression to project the map-of-objects value Sep 14, 2020 · Hi, I can see that Terraform includes the following distinct Function. list_groups) If you every have the same key (like dev-api-us) in more than one of the maps in the list then Terraform will keep the last value it saw for each key, taking the maps in the order given in the list. In this case you'll want to use the lookup function to retrieve the value from the map which itself has been accessed with square brackets, that will look like this Terraform Variable Types In Terraform, you must specify the type of data that needs to be assigned to a variable, passed to and from modules, or output. Nov 27, 2022 · terraform get index value from the list of maps Asked 2 years, 5 months ago Modified 2 years, 5 months ago Viewed 380 times The 'one' function transforms a list with either zero or one elements into either a null value or the value of the first element. aws_cloudformation_export. Jan 26, 2023 · how to access keys and values from list of map dictionary using Terraform for loop Asked 2 years, 9 months ago Modified 2 years, 9 months ago Viewed 1k times Apr 19, 2020 · I'd like to extract the key values for each Topic and use them in a list in terraform template in this format ["value1","value2","value3"]. Oct 8, 2024 · Introduction In Terraform, iterating through a map variable involves using the for_each meta-argument along with the keys function. While a single variable stores a single value, maps can store multiple values as key-value pairs. This combination enables you to dynamically create resources or perform actions based on the key-value pairs within your map. This article explains Terraform maps, in case you’re not familiar yet, and the explores the Terraform lookup() function with usage examples and a few usage Feb 14, 2024 · Example Consider this scenario: you have a list of property names. Jul 25, 2019 · A Terraform 0. For instance, you can use lookup to dynamically fetch the configuration values for your AWS instance based on the environment in which you want it to be deployed. For example, if the caller of the module were to set the value like this: Jun 21, 2022 · How can I create a list of Dev accounts IDs as below from the above map?. tf code to the list of file variables. Apr 25, 2021 · How to fetch value from a list of map variable Terraform arun-a-nayagam April 25, 2021, 4:44pm 1 Jul 28, 2025 · Referencing values from lists and maps in Terraform might look scary at first, but once you see it like a warehouse system of labels and positions, it becomes second nature. Mar 9, 2021 · How to retrieve the value from a map-type variable using the key? Asked 4 years, 7 months ago Modified 2 years, 8 months ago Viewed 16k times Nov 17, 2024 · Learn how to effectively map a list of maps in Terraform to extract specific field values and create a new list tailored to your needs. Nov 10, 2022 · Hi, From a data source I get a list of ids. 12 based on condition Asked 5 years, 3 months ago Modified 5 years, 3 months ago Viewed 5k times Jul 8, 2023 · Terraform, a popular Infrastructure as Code (IaC) tool, provides a powerful feature known as foreach to iterate over collections such as lists, sets, and maps. /m… The keys function returns a list of the keys in a given map. Sometimes, you may need dynamic or variable… Jan 24, 2020 · I am trying to extract both left and right values from the terraform map variable but couldn't extract the left value. fr Feb 3, 2024 · This Terraform expression filters the input map to include only the items that have keys starting with ‘a’, producing: { "a" = "apple" } Filtering Based on Value Similarly, you also can filter maps based on their values. For more information on the value types in the Terraform language, see Type Constraints. private_subnets. ${r. One common structure you’ll encounter is a map, an associative array containing key-value pairs. I was referring to following discussion to figure it out However, my requirements are a bit different as you can see below: Variable Object looks like this: variable iam-policy-users-map { default = { # following dataset does not work "policy3 Oct 19, 2022 · Here we’re using string interpolation to create a new value for each element of azs within a given region object. Maps in Terraform are a type of input variable that store multiple key-value pairs. index)}". The filtering expression would look something like this Jul 7, 2022 · In this post, we will discuss a use case where we want to access the variable value which is part of the list or the map. Oct 28, 2023 · Terraform for loop for list comprehension The same terraform for loop construct can be used for List comprehension as well. The first occurrence of each value is retained and the relative ordering of these elements is preserved. zone_name}"] You can use an expression like the above in the place where you need the list of hostnames, and its result value should be the same as what @JamesStanley showed in the initial example. Feb 3, 2024 · This piece of Terraform code reads the config. It returns the key value only when a matching key is found. This is useful when you want to manage multiple similar resources or configurations in a more dynamic way. yaml file, decodes the YAML content into a Terraform map, and stores it in a local variable called config. This can include converting two related lists — one of keys and another of values — into a It looks like you don't care about the keys, but you know the structure of your map, you can dig out all of the values without caring about [some of] the key names. tf variable "notebook" { type = "map" Oct 9, 2023 · Terraform is a powerful infrastructure-as-code tool that allows you to define and provision infrastructure resources. Types of Named Values The main kinds of named values available in Terraform are: Resources Input distinct takes a list and returns a new list with any duplicate elements removed. The yamldecode function interprets the YAML file and converts it into a map that Terraform can understand. Perhaps by “distinct map object” you mean that you’d like to just discard that duplicate object and keep only one of them? If that’s your goal then one way to achieve that would be to convert your list into a set of objects Aug 10, 2024 · In terraform there is no actual if else condition block. Jul 22, 2020 · I need to create network security group rules for the list of map values referenced in Scenario #1. May 30, 2023 · List - In Terraform, a list is a data structure that allows you to store and manage a collection of values. These variables provide flexibility and allow you to work with collections of data. Finally, since you want a single list, the flatten function will be useful. You can then access the values like so: Sep 29, 2023 · I have a requirement to use nested Map(objects) or List(objects) for creation of multiple resources using for_each Example Code I'm using to define variable: variable "private_endpoints" Apr 3, 2020 · An important aspect of resource for_each is that the keys in the given map become part of the unique address of each instance of that resource. Jan 2, 2021 · I typically use this sort of approach because a data structure like that intermediate local. name}. Feb 1, 2022 · I have a tuples which are mapped to a local variable locals { my_val = [ { region = "us-east-1" value = 1000 data = 3000 }, { region = "us-east-1" value = 1001 data = 4000 }, { region = "us-east2" value = 1002 data = 5000 } ] } I need to remove the duplicates based on the value of the pair, here I want to place the condition for region us-east-1 and the output should be { my_val = [ { region Jan 11, 2022 · I need to get 1st element (or at least any root level element) of an object in Terraform. Also learn about complex types and type conversion. But how to do the opposite? If I have the following map in terraform variable "map" { default = { "key1" : "value1" "key2" : "value2" } } How would I retrieve let's say "key2" if "value2" is given? I am assuming there are no duplicate keys or values. Jan 18, 2024 · My goal is to build aws_network_acl_rule’s based on a list of maps which comes from a data source. You can use the following simple statement: Assuming: key is map's key you're filtering on val is the value of the key list is the original list of maps element([ for element in list) : env if element. Includes examples and code snippets. Feb 3, 2024 · Introduction In Terraform, managing infrastructure often requires handling collections of resources. Mar 5, 2022 · Most of the time you don’t need to worry too much about this distinction, but I mention it here because map elements are not ordered either and so projecting a map into a list as shown above requires Terraform to choose an ordering for the map. ids) source = ". The lookup() function is essential for retrieving values from maps dynamically. values : k if v == "a" ] Apr 17, 2023 · │ The given "for_each" argument value is unsuitable: the "for_each" argument must be a map, or set of strings, and you have provided a value of type tuple. One of its powerful features is the use of map variables, which allow you to store key/value pairs for better organization and reusability in your Terraform configurations. Jan 1, 2025 · In Terraform, extracting a list of specific elements from a list of objects is a common task. key == "val" ], 0) the result of the above statement will be a map. For example, how would I access account in properties. lookup retrieves a value from a map given its key. Jul 31, 2019 · Terraform supports uppercase letters and dashes in identifiers only to make it more convenient to write names that will be sent to remote systems that may have different conventions. This guide includes examples and code snippets to help you get started. Examples Dec 18, 2019 · How to fetch a value from list of maps in terraform 0. However, when it comes to nested collections, like a list of maps within a list of maps, things can get a bit tricky. Create a variable of type list to pass the list of files. Terraform obscures both the database_password variable and any resource arguments that use that variable, for example Terraform logs the following when applying the configuration: Here comes the for_each expression. This approach allows you to iterate through the original list, access desired attributes from each object, and create a new list containing only those specific values. May 31, 2024 · The Terraform lookup() function provides a powerful feature that can be used to implement more flexible and easily configurable infrastructure configurations. 6 or later then you can use for_each instead of count to produce one instance for each element in your map: resource "aws_route53_record" "proxy_dns" { Feb 3, 2024 · This Terraform snippet demonstrates how to read the YAML file and use its values to provision a VM. Two essential helpers in your toolkit are map() and tolist(). The { } braces construct an object value, and then the tomap function then converts it to a map. I tired to use keys function but not sure how to search the DEV value inside the keys function. 2. Nov 13, 2024 · Learn how to efficiently merge maps within a list using Terraform to simplify your infrastructure as code and improve resource management. When you run a plan or apply operation, Terraform displays sensitive values as (sensitive value). Is there a way to get the index of a map, or create a counter for a number that increments? Learn how to use the Terraform for_each statement to iterate over a list of objects, such as a list of VMs or a list of IP addresses. i1 v50s h58j 0yb8 1cbny tth lzet llomkf 1rl22 yb