Angular — Reading data from JSON file using HttpClient (2024)
In this post, we will discuss on how to read data from a JSON file which is there locally in our assets folder within our repo. So without wasting much time let’s start.
Step 1: Create a new Angular Project
Create a angular project using CLI command:
ng new json-read-example
Step 2: Create a JSON file with some user information under assets folder
Create a data.json file with some user details under our assets folder. Lets have some user information something like:
Step 3: Import Http client module in our root module
Import HttpClientModule in our root module. (app.module.ts) like below:
Step 4: Inject Http client in our component
InjectHttpClient in our component (app.component.ts). We are using HTTP get method read the json data from our data.json . Below is the snippet to inject HttpClient.
Step 5: Using OnInit lifecycle hook, get the JSON data using http
Now we are going to implement the OnInit interface and we make an HttpGET request to read the data. Please refer the snippet below:
Here, the response that we get is assigned to a property UserInfo and finally we display the information in out view in next step.
Step 6: Display user details
We could use interpolation and jsonpipe for displaying the content in json format. Please find the HTML snippet below:
Our final output will be like:
Please find the stackblitz link for reference:
Summary
Using local JSON files in Angular applications is very easy, And it’s very useful when we need to show some static data at front end.
Thank you everyone for reading the article. I hope you enhanced your some knowledge in Angular. Please support this article with your support to help it spread to a wider audience🙏🙏🙏.
To return JSON from the server, you must include the JSON data in the body of the HTTP response message and provide a "Content-Type: application/json" response header. The Content-Type response header allows the client to interpret the data in the response body correctly.
Instead, you select the exact property you want and pull that out through dot notation. The dot ( . ) after response (the name of the JSON payload, as defined arbitrarily in the jQuery AJAX function) is how you access the values you want from the JSON object.
In the below code, firstly we import the JSON module, open the file using the file handling open() function, and then store the data into the variable 'data' using the json.load() function. After that, we iterate over the data and print it.
To read the JSON file in Java, “FileReader()” method is used to read given JSON file. The above code is the file that is used to read. we use the “json. simple” library.
Use the HTTPClient.get() method to fetch data from a server. The asynchronous method sends an HTTP request, and returns an Observable that emits the requested data when the response is received. The return type varies based on the observe and responseType values that you pass to the call.
JSON Web Services let you access portal service methods by exposing them as a JSON HTTP API. Service methods are made easily accessible using HTTP requests, both from JavaScript within the portal and from any JSON-speaking client.
Import JSON from the modules. Open the JSON file in read-only mode using the Python with() function. Load the JSON data into a variable using the Python load() function. Now, get the value of keys in a variable.
In JSON, data is typically stored in either an array or an object. To access data within a JSON array, you can use array indexing, while to access data within an object, you can use key-value pairs. In the example above, there is an object 'car' inside the JSON structure that contains two mappings ('model' and 'year').
Use the JavaScript function JSON.parse() to convert text into a JavaScript object: const obj = JSON.parse('{"name":"John", "age":30, "city":"New York"}'); Make sure the text is in JSON format, or else you will get a syntax error.
The API always returns a JSON object with the “Content-Type” set to “application/json” or “text/x-json”. In case of an error: { “code”: ! 0, “message”: … }
Introduction: My name is Pres. Lawanda Wiegand, I am a inquisitive, helpful, glamorous, cheerful, open, clever, innocent person who loves writing and wants to share my knowledge and understanding with you.
We notice you're using an ad blocker
Without advertising income, we can't keep making this site awesome for you.
