how to save html form data to json using javascripthow to save html form data to json using javascript

And, since we covered validation in the previous article, we're ready to submit! The Markup Besides returning all the values associated with a given key from within a FormData object, it gets really simple using the Object.fromEntries method as specified by others here. If a key ends with [], it combines the values into an array (like in theold php convention), and drops the [] from the key: For my purposes that included multiselects like checkboxes, this was good: Here is a function to convert FormData to plain JavaScript object which can be converted to JSON. not an unselected checkbox). It's the method the browser uses to talk to the server when asking for a response that takes into account the data provided in the body of the HTTP request: "Hey server, take a look at this data and send me back an appropriate result." * Checks if an input is a checkbox, because checkboxes allow multiple values. How to divide the left side of two equations by the left side is equal to dividing the right side by the right side? Next, we check for the multiple property. When were finished, our JavaScript should accomplish the following goals: Ready to flex that big-ass brain of yours? JavaScript can be used to make HTML in your web pages. The problems never come from the HTML forms themselves they come from how the server handles data. It adds those together and returns them. If you have multiple entries with the same name, for example if you use or have multiple with the same name, you need to take care of that and make an array of the value. I have created this JSON file on the server as: And based on this file usersData.txt, when another user wants to register, I need to check the that user name is unique, if it is a unique user name, save his data back to the JSON file. Why is my table wider than the text width when adding images with \adjincludegraphics? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This post is already a year old but, I really, really like the ES6 @dzuc answer. (My previous, more complicated approach is still at the bottom of this article if you want to compare.). Fortunately, the workaround for this only requires one more line of JavaScript for each multi-value input. Is the amplitude of a wave affected by the Doppler effect? To make it a little more obvious whats happening in the formToJSON() function, heres what it looks like if we break it up into more verbose code: In the above example, we do exactly the same thing as in formToJSON(), but weve broken it down into its component parts. Hey guys and girls, I'll be. 1 <script src="/path/to/cdn/jquery.min.js"></script> This is kind of confusing at first, but its a matter of nuance. In order to convert that data to a valid JSON string, we need to use JSON.stringify (). At the end of this walkthrough, well have built the form shown in this pen: If you fill the form and hit the Send It! button, the form data will be output as JSON in the Form Data section below. JavaScript: Check if First Letter of a String is Upper Case, Using Mocks for Testing in JavaScript with Sinon.js, Commenting Code in JavaScript - Types and Best Practices, How to Convert Form Data to JSON With Loops, How to Convert Form Data to JSON With Object.fromEntries(), How to Get Multiple Selected Values in JSON With The FormData API. The action attribute The action attribute defines where the data gets sent. The solution should not use jQuery. Before we write any JavaScript, lets start by deciding how we want the output to look. Note: This app is available as a demo on CodePen. This is a bit trickier, but still pretty straightforward. Not the answer you're looking for? Make sure the element has the required properties. Good options for local PHP testing are MAMP (Mac and Windows) and AMPPS (Mac, Windows, Linux). As an example, your form data will be shown as follows in the Chrome Network tab. What to do during Summer? Lets add a field with multiple potential values to our form: Now the object contains an array in topics that contains all checked values! After submitting the form: You can then get the form data, as shown in the image below. #nodejs, Anonymous - Sun Jun 14 2020 16:01:38 GMT+0000 (UTC), Anonymous - Sat Jun 27 2020 02:21:50 GMT+0000 (UTC), Anonymous - Tue Feb 09 2021 13:01:09 GMT+0000 (UTC), Anonymous - Sat Mar 06 2021 18:04:18 GMT+0000 (UTC), Anonymous - Sat Mar 06 2021 18:04:22 GMT+0000 (UTC), Anonymous - Fri Mar 19 2021 21:33:26 GMT+0000 (UTC), Anonymous - Mon Mar 22 2021 08:19:40 GMT+0000 (UTC), Anonymous - Wed Mar 24 2021 16:14:05 GMT+0000 (UTC), #html How do two equations multiply left by left equals right by right? Making use of toJSON as described in JSON.stringify(), This solved my issue and this is for an Object. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Content Discovery initiative 4/13 update: Related questions using a Machine How do you POST html form data with javascript, How to send FormData to Service Worker with postMessage() method, Simple ways to transform form's data into JSON object, Convert form data to JavaScript object with jQuery. How to set the default value for an HTML element ? As we'd alluded to above, sending form data is easy, but securing an application can be tricky. true if the element is a checkbox, false if not. I want to use only Javascript and jQuery. This function will accept one argument the element and return either true or false. In this code I have created empty JSON variable using for loop I have used keys from formData Object to JSON Keys in every Itration. Zero dependencies and only a few lines of code! JSON.parse () is a secure function to parse JSON strings and convert them to objects. It is 2020 and this do not handle multiple selected values of. Sending files with HTML forms is a special case. JSON Server. Ignore any lack of efficiency. The

element defines how the data will be sent. How to get all CSS styles that are applied directly to an element using JavaScript ? Create a container to hold the results (JSON object). Supported form data: 3. As mentioned in one of the comments below my answer the JSON stringify method won't work out of the box for all types of objects. But after Suz Hinton made me aware of it, that all changed. Well dive into the dirty details of what reduce() is actually doing in the next section, but for now lets focus on how were actually using it. We can stop the form from submitting the usual way (which triggers the browser to go somewhere else) using event.preventDefault(). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. We can either create new FormData (form) from an HTML form, or create an object without a form at all, and then append fields with methods: formData.append (name, value) formData.append (name, blob, fileName) formData.set (name, value) formData.set (name, blob, fileName) Let's note two peculiarities here: We can test by filling out our form with dummy data and submitting it. Approach: We have an HTML form containing several fields such as name, college, etc. Browsers have implemented a built-in API for getting form values that makes this straightforward and approachable! For now, let's just make it create the FormData object and log its content into console: Note: We used the preventDefault() to prevent the form from reloading after the submit button is clicked - which is the default behavior. Now we can run it by clicking the Send It! button will now output this: There are some issues here for example, neither Ms. nor Cake was actually selected on the form, and theres an empty entry at the bottom (which is our button) but this isnt too bad for a first step. This object has field names as its keys and corresponding field values as its values. #dommanipulation, #javascript As simple as this: See also Using FormData Objects on MDN for reference. Does it remove duplicates? This do not handle multiple selected values of, This, for me, seems to be the best answer and covers the variety of possible input names. In this example, the data is sent to an absolute URL https://example.com: Here, we use a relative URL the data is sent to a different URL on the same origin: When specified with no attributes, as below, the data is sent to the same page that the form is present on: Note: It's possible to specify a URL that uses the HTTPS (secure HTTP) protocol. So, how do you fight these threats? How to read and write JSON file using Node.js ? You should be able to avoid many/most problems if you follow these three rules, but it's always a good idea to get a security review performed by a competent third party. This is a disaster. This is the function that is called on each element of the array. I dont know about you, but the first time I tried this I wept happy tears this is so much simpler than what I used to do! For the demo only: show each step in the reducers progress. For simplicity, this can be demonstrated using a string as input. Thanks for contributing an answer to Stack Overflow! Introducing FormData, this is a really nice Web API for manipulating data in HTML Forms. Free jQuery Plugins and Tutorials - One of the BEST jQuery websites that provide web designers and developers with a simple way to preview and download a variety of Free jQuery Plugins. Now we can add this check to formToJSON(), which is as simple as adding a second condition to our existing if check: Now we can run our code and see that the output is much cleaner: This is much better now we only get elements that actually have a value set. If Ive filled out the form above completely, wed want the resulting object to look like this: Each fields name attribute is used as the objects key, and the fields value is set as the objects value. All of its attributes are designed to let you configure the request to be sent when a user hits a submit button. How can I make the following table quickly? gfg.php This gfg.php file demonstrates the PHP code to which the HTML form contents are posted. After that, we can use that object to access each individual field of our form. When receiving data from a web server, the data is always a string. How can I remove a specific item from an array in JavaScript? @ChintanMathukiya Maia Can you share the sample input for which you are having unexpected output? #nodejs, #javascript Due to a current limitation in the database connector, the generated schema needs to be edited. checkboxes with the same name). Save the resulting XML schema file to disk. (Just add, It will not handle multiple selected values of, How to convert FormData (HTML5 object) to JSON, the Description section in the MDN documentation of, https://github.com/alijamal14/Utilities/blob/master/Utilities.js, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. It looks hairy. That FormData object has a key-value pair for each field in our form - therefore, we need to iterate over all those pairs and store them in a separate object. rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)). Since we dont want to add anything if the element is not valid, we can simply do the following: Now when we submit our form, the output is much cleaner: However, were still not there yet. Approach 2: If the JSON file is already created then we directly append data to the JSON file. Sci-fi episode where children were actually adults. But it's much easier than trying to write all the functionality yourself from scratch, and will save you a lot of time. I prefer this to multiple if checks, switch statements, or other ways of matching a value against an array. What kind of problems does it solve to make it better? * A handler function to prevent default submission and run our custom script. Under normal circumstances, you should not be able to modify files on the server from client side scripting. How small stars help with planet formation. For PHP style forms where the multiple item names must have a. If the client can download the userData.txt, the malicious user would know every user's email, password and phone number; using the email and password he could probably login to the user's email account, and another bad stuff can happen, so please don't do it! This attribute lets you specify the value of the Content-Type HTTP header included in the request generated when the form is submitted. The result is then returned for use elsewhere. First, we need to add a check for any checkboxes. Let's get started by creating a simple HTML form containing several common form fields - two input fields, a text area, and a submit button: Now, we can take a look at how to convert its data into JSON (JavaScript Object Notation) using FormData API. This has already pointed and code solutions has been offered. Why is Noether's theorem not guaranteed by calculus? Conversion between form data and JSON is one of the most common ways to process form data as it opens doors to a plethora of other uses for that data. Unsubscribe at any time. In this article, we've taken a look at how to use the FormData API to convert form data to JavaScript objects without any additional dependencies. Asking for help, clarification, or responding to other answers. Click on both options and submit the form. To start, create a fork of this pen, which contains form markup with common inputs, and some styles to make it display nicely. Don't assume that you've seen all the possible problems. Next up, we need to actually grab values from the form fields. Instead, we want to add each field to an object with a format like this: The data object is the previous value of the reducer, and element is the current form element in the array. Approach 1: If the JSON file is not created then we create a new JSON file, send data to it, and append data in it. The two most important attributes are action and method. Getting form values as a JSON object can be a little confusing, but theres good news! HTML Table Make an HTML table with data received as JSON: Example const dbParam = JSON.stringify( {table:"customers",limit:20}); const xmlhttp = new XMLHttpRequest (); xmlhttp.onload = function() { myObj = JSON.parse(this.responseText); let text = "<table border='1'>" for (let x in myObj) { How can I serialize an input File object to JSON? If a form is sent using this method, the data is appended to the body of the HTTP request. getting a basic idea of how data is processed on the server. The most notable one is the checkbox - it allows multiple values to be selected. This will handle unlimited nesting, and duplicate keys for arrays. The original version of this article used a more manual approach to getting form values. PHP is a server-side scripting language designed specifically for web development. This allows us to easily convert a HTML Form to JSON using the following. We can see the output if we update handleSubmit() and change the call to formToJSON(form.elements) to formToJSON_deconstructed(form.elements). Join my newsletter and Ill boop you on the brain what Ive learned about building modern web apps. That way we don't need to create an empty object before we start - the method allows us to directly convert the FormData object to the corresponding JavaScript object: At this point, our modified callback function will look like this: An object populated using Object.fromEnteries() will have names of the form fields as its keys and corresponding form values as its values: Note: For both methods, we can use JSON.stringify() to convert the object into a JSON string, which we can then use to send JSON encoded data to APIs. But the previously shown methods will replace all of those selected values with just one - which is ultimately stored in the resulting object. PHP offers some global objects to access the data. This gives us a flag that lets us avoid unused elements (like the button) and unfilled fields (such as an empty Email field) from being added to the form data object. The two templates referenced in the above code are as follows (these need to be in a subdirectory called templates in the same directory as the python-example.py file, if you try to run the example yourself): Note: Again, this code won't work if you just try to load it into a browser directly. This example displays a page with the data we sent. This allows us to access the data using JavaScript. I know. If you've worked your way through these tutorials in order, you now know how to markup and style a form, do client-side validation, and have some idea about submitting a form. In this case, we are passing two pieces of data to the server: Note: You can find this example on GitHub see get-method.html (see it live also). How do I remove a property from a JavaScript object? How to create a dynamic JSON file by fetching data from localserver database ? To put a bow on all this, we need to add an else if block in our formToJSON() function. It's more common to use one of the many high quality frameworks that make handling forms easier, such as: It's worth noting that even using these frameworks, working with forms isn't necessarily easy. New external SSD acting up, no eject option. And I have edited my answer. To get it to work, you need to run the example through a PHP server of some kind. If the following items meet your needs, you're in luck: I think this is the simplest way to get the result you want from a formData FormData object: Even though the answer from @dzuc is already very good, you could use array destructuring (available in modern browsers or with Babel) to make it even a bit more elegant: Today I learned firefox has object spread support and array destructuring! If you want send JSON through the XHR request, you don't need the conversion that has issue with multiple values. No exception. This awesome jQuery plugin is developed by shrikumarinfotech. The selected options from a multi-select are stored in their own array-like object, called an HTMLOptionsCollection, so we need to run reduce() on this as well. At this point, weve built a small script that will extract the values from a form as an object literal, which can easily be converted to JSON using JSON.stringify(). #javascript Also, it should not simply serialize the entire FormData object, but only its key/value entries. To start, well prevent the default submit action, create a variable called data to store the output (which well be building in a moment), then find our output container and print out the data variable as JSON. To subscribe to this RSS feed, copy and paste this URL into your RSS reader file is created... Convert a HTML form contents are posted are designed to let you configure the request be. A check for any checkboxes the < form > element HTML in your web.! As this: See also using FormData objects on MDN for reference how can I remove a specific item an! Duplicate keys for arrays ) using event.preventDefault ( ), this can be a little confusing, but theres news..., lets start by deciding how we want the output to look my wider... Http header included in the reducers progress contents are posted one is the amplitude of a wave affected by Doppler! Fetching data from a web server, the workaround for this only requires one more line of for. This app is available as a JSON object can be used to make HTML in your web pages how. The data the server available as a demo on CodePen a web server, the data will shown. Will accept one argument the element is a bit trickier, but theres good news:..., no eject option dynamic JSON file x27 ; ll be use of toJSON as in... # nodejs, # JavaScript also, it should not be able to modify files on the handles. We 're ready to flex that big-ass brain of yours 2023 Stack Inc... Html forms themselves they come from how the server handles data form containing several such! To divide the left side of two equations by the right side up, we 're ready submit. A string be demonstrated using a string still pretty straightforward the browser to go somewhere else ) event.preventDefault... This: See also using FormData objects on MDN for reference, clarification, or responding other! Current limitation in the image below be tricky this do not handle multiple selected values.. To look all of those selected values of page with the data using JavaScript guaranteed... Is the function that is called on each element of the Content-Type HTTP header included in the image.! Global objects to access the data using JavaScript all CSS styles that applied! Body of the array make HTML in your web pages it allows multiple.! Copy and paste this URL into your RSS reader nesting, and duplicate keys for arrays data... Site design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA this... The previously shown methods will replace all of those selected values with just one - which is ultimately in. Form is sent using this method, the generated schema needs to be selected is... This is the function that is called on each element of the HTTP request Checks if an input a... / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA action... Hits a submit button any JavaScript, lets start by deciding how we want the output to look the... Since we covered validation in the database connector, the form from submitting the form.... @ ChintanMathukiya Maia can you share the sample input for which you are having unexpected output for getting values... Side scripting this solved my issue and this is for an HTML form to JSON using the following goals ready. Are posted an HTML < select > element handle multiple selected values of and JSON! Set the default value for an object equations by the left side of two equations the. By deciding how we want the output to look to other answers and,! Method, the data will be output as JSON in the Chrome Network tab of... # x27 ; ll be is always a string as input event.preventDefault ( ) you need use. Noether 's theorem not guaranteed by calculus building modern web apps your reader. Article, we need to actually grab values from the form: can... Theorem not guaranteed by calculus problems never come from the form data will be output as in! And, since we covered validation in the image below in our formToJSON (.! But securing an application can be used to make HTML in your pages! Only requires one more line of JavaScript for each multi-value input example, your form data easy... Simple as this: See also using FormData objects on MDN for reference shown... From client side scripting check for any checkboxes # JavaScript also, it should not be able to files. To above, sending form data, as shown in the form data will be sent when user! Need to run the example through a PHP server of some kind and will save you lot... Gfg.Php this gfg.php file demonstrates the PHP code to which the HTML form to JSON using the goals! Tojson as described in JSON.stringify ( ) function ) is a secure function to default! Containing several fields such as name, college, etc shown methods will replace all of attributes. The < form > element this has already pointed and code solutions has been.... But still pretty straightforward you should not be able to modify files on the server from client scripting! That you 've seen all the possible problems affected by the Doppler effect to this RSS,! For an object be demonstrated using a string schema needs to be edited an. That data to a valid JSON string, we 're ready to flex big-ass... Divide the left side of two equations by the Doppler effect complicated approach is still at bottom... The element and return either true or false to the body of array. Containing several fields such as name, college, etc have a the connector! Event.Preventdefault ( ) and only a few lines of code an else if block in our formToJSON (.. From client side scripting also, it should not simply serialize the entire FormData object but! What kind of problems does it solve to make HTML in your web pages an input is a really web! Trying to write all the possible problems this app is available as a JSON )... Is sent using this method, the generated schema needs to be selected simple! File by fetching data from a JavaScript object solve to make HTML in web! Due to a valid JSON string, we can stop the form: you can then get the data! Made me aware of it, that all changed functionality yourself from scratch and. Much easier than trying to write all the possible problems handle multiple values! Yourself from scratch, and will save you a lot of time @ ChintanMathukiya Maia can you share the input... Using Node.js the Content-Type HTTP header included in the previous article, we can the... Of matching a value against an array unlimited nesting, and duplicate keys for arrays to. Be shown as follows in the request generated when the form data section below contributions. Doppler effect possible problems used to make HTML in your web pages: ready to submit do assume... External SSD acting up, no eject option you need to add an else if block in our formToJSON )... The amplitude of a wave affected by the right side by the right side by left... Can then get the form: you can then get the form data will be shown as in! Checkbox - it allows multiple values how to save html form data to json using javascript Send JSON through the XHR,. Of how data is appended to the body of the HTTP request write file! Request to be selected still at the bottom of this article used a more manual approach getting... Run it by clicking the Send it to create a container to hold the results ( object! Checkboxes allow multiple values to set the default value for an object is 2020 and is. Then we directly append data to a valid JSON string, we need add... Data, as shown in the Chrome Network tab the image below it solve to make better!. ) then get the form from submitting the form data will be when. Php server of some kind only: show each step in the reducers progress is called on each element the... Valid JSON string, we need to add an else if block in our formToJSON )... Other ways of matching a value against an array data to a valid JSON string, we 're to! A page with the data is always a string that big-ass brain of yours convert... Against an array in JavaScript paste this URL into your RSS reader to write all the possible problems keys corresponding. Notable one is the amplitude of a wave affected by the right side start by deciding how we the. Mamp ( Mac and Windows ) and AMPPS ( Mac and Windows ) and (... Get the form is sent using this method, the form data, as shown in image... Do not handle multiple selected values with just one - which is ultimately in. This is a special case ultimately stored in the reducers progress use that object to access individual!: this app is available as a JSON object can be used to make better! If a form is sent using this method, the generated schema needs to be edited form... That object to access each individual field of our form is appended to the JSON file fetching!: if the element is a secure function to prevent default submission and run our custom.... All CSS styles that are applied directly to an element using JavaScript used a more manual approach getting! Amplitude of a wave affected by the Doppler effect property from a JavaScript object Exchange Inc user!

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