12 Best Free Online JavaScript Validator Websites
Here is a list of best free online JavaScript Validator websites. A JavaScript validator is a tool that helps developers quickly identify errors in the JS syntax and code. JS validators can automatically detect errors and show warnings to users when they detect mistakes. To further help out users, JavaScript validators show the line of error, column of error, and description of errors. Some of the common mistakes that JavaScript validators can detect are missing semicolons, mismatched brackets or parentheses, undefined variables, and unused variables. If you are looking for free online JS Validators, check out these JavaScript validator websites.
On these websites, users get a large editing area on which users can write as well as paste their JS code. Some of these websites can also fetch JS code files from online sources using their URL links. After submitting the JS code, users can view the detected errors and warnings. Some websites even show the line, column, and description of each detected error. Users can manually fix all the errors to finally validate the JavaScript code. The process to perform the entire JS validation process is also quite simple.
These websites also offer additional online tools such as JSON Formatter, XML Formatter, CSS Beautifier, XML Minifier, etc. Go through the list to know more about these websites.
My Favorite Online JavaScript Validator Website:
codebeautify.org is my favorite website as it highlights and describes all the detected errors. Plus, it supports syntax highlighting to improve JS code readability.
You can also check out lists of best free Online CSS Validator, Online MTA-STS Validator, and Online JSON Validator websites.
Comparison Table:
| Features/Website Names | Highlight all errors | Shows description of errors | Supports syntax highlighting |
|---|---|---|---|
| codebeautify.org | ✓ | ✓ | ✓ |
| esprima.org | ✓ | ✓ | ✓ |
| beautifytools.com | ✓ | ✓ | ✓ |
| jshint.com | x | ✓ | ✓ |
| edchart.com | x | ✓ | ✓ |
| techiedelight.com | ✓ | x | ✓ |
| lambdatest.com | ✓ | x | x |
| htmlstrip.com | ✓ | ✓ | x |
| bfotool.com | ✓ | ✓ | ✓ |
| jslint.com | ✓ | x | ✓ |
| commontools.org | ✓ | ✓ | ✓ |
| browserling.com | x | x | x |
codebeautify.org
codebeautify.org is a free online JavaScript validator website. Using this website, users can check the syntax and validate JavaScript code. It immediately identifies errors in the code and highlights the lines that carry them. It also adds syntax highlighting to the code to improve readability. Users can also choose to edit JavaScript code on it. It also supports JavaScript code files and is capable of fetching files from online sources using their links. After validating the code, users can save the final code as a TXT file. This website also answers common queries related to JavaScript validators. Now, follow the below steps.
How to validate JavaScript code online using codebeautify.org:
- Go to this website and open up the JavaScript Validator.
- After that, enter the JavaScript code in the input field.
- Next, click on the Validate JS button to view potential errors.
- Finally, manually fix errors if any click on the Download button.
Additional Features:
- This website also comes with additional online tools like JSON Formatter, XML Formatter, JSON Beautifier, XML Minifier, and more.
Final Thoughts:
It is a good online JavaScript validator website that helps users quickly validate their JavaScript codes.
| Pros | Cons |
|---|---|
| Supports syntax highlighting | |
| Shows line of errors and type of errors |
esprima.org
esprima.org is another free online JavaScript validator website. This website has a simple syntax validator that can also check mistakes and errors in JavaScript code. To improve the code readability, it adds the syntax highlighting method.
This syntax validator automatically adds a red highlight to the lines where it finds errors that users can fix manually as it supports code editing. By hovering over the red highlight, users can find out the error type. After clearing out all the errors, users can copy the final validated code. Now, follow the below steps.
How to perform JavaScript validation online using esprima.org:
- Go to this website and open up the Syntax Validator.
- After that, enter the JavaScript code.
- Next, fix the highlighted code errors if detected.
- Finally, copy the validated JavaScript code and save it locally.
Additional Features:
- This website also comes with additional tools such as Regex Collector, Operator Precedence, Source Rewrite, Identifier Highlight, and more.
Final Thoughts:
It is another simple online JavaScript validator website that quickly identifies and highlights syntax mistakes and errors.
| Pros | Cons |
|---|---|
| Supports syntax highlighting | |
| Shows the type of errors |
beautifytools.com
beautifytools.com is another free online JavaScript validator website. This website comes with multiple code beautification tools one of which is a Javascript Validator. It helps users find and rectify mistakes and errors in their JavaScript codes. It is also capable of highlighting the line and type of errors, which helps users quickly find them. It also adds syntax highlighting to the input code for better readability. Besides this, it also comes with a Format Code tool that optimizes the code by reducing unused lines and space. In the end, use the validate Code button to validate the code after removing all the mistakes. Now, follow the below steps.
How to perform JavaScript validation online using beautifytools.com:
- Visit this website and open up the JavaScript Validator option.
- Next, paste or write the JavaScript code.
- Now, view and fix the detected errors.
- Finally, click on the Validate Code button and copy the final code.
Additional Features;
- On this website, users also get handy tools like CSS Beautifier, HTML Beautifier, JSON Minifier, Excel to SQl Converter, HTML Decoder, and more.
Final Thoughts:
It is another simple and effective online JavaScript validator website that quickly identifies errors and helps users fix them.
| Pros | Cons |
|---|---|
| Can show the type of errors and line of errors | |
| Can optimize code space using format code tool |
jshint.com
jshint.com is another free online JavaScript validator website. This website offers a large JavaScript code-writing area on which users can write and validate their JavaScript code. Plus, it can immediately detect and highlight both syntax errors and warnings. It also shows the line and type of detected errors. Besides errors, it also shows undefined and unused variables, unlike most other similar websites. Now, follow the below steps.
How to perform JavaScript validation online using jshint.com:
- Go to this website using the provided link.
- After that, write or paste the javaScript code on its interface.
- Now, view and fix detected errors, warnings, and used variables.
- Finally, copy the validated code.
Final Thoughts:
It is another good online JavaScript validator website that can detect both warnings and syntax errors.
| Pros | Cons |
|---|---|
| Can detect warnings, errors, and unused variables |
edchart.com
edchart.com is another free online JavaScript validator website. This website comes with an advanced Javascript validator that can immediately detect syntax errors and highlights their location. Besides this, it also explains the type of detected errors. To improve the readability of the code, it automatically implements syntax highlighting. To reduce the unnecessary gaps in the JavaScript code, users can use its Format option. After fixing all the detected errors, users can validate the final JavaScript code. Now, follow the below steps.
How to perform JavaScript validation online using edchart.com:
- Visit this website and open up this tool.
- After that, write or paste the JavaScript code.
- Next, view and fix the detected errors.
- Finally, click on the Validate button and copy the final code.
Additional Features:
- On this website, users also get multiple additional Code Beautifier and Minifier tools like CSS Beautifier, JSON Minifier, XML Minifier, and more.
Final Thoughts:
It is another simple and effective online JavaScript validator website that helps users perform the validation of JavaScript code.
| Pros | Cons |
|---|---|
| Can detect line and column of errors | |
| Describes the type of detected errors |
techiedelight.com
techiedelight.com is another free online JavaScript validator website. This website comes with a clean and simple JavaScript validator through which users can find and correct JavaScript syntax errors. It also highlights lines with errors. After fixing all the errors, users can validate the JavaScript code. To improve the overall readability, it adds syntax highlighting to the input code. I also like its ability to fetch JavaScript code files from online sources using their URL links. Now, follow the below steps.
How to perform JavaScript validation online using techiedelight.com:
- Go to this website and access the JavaScript validator.
- After that, enter the JS code in the input field.
- Next, view the detected errors and fix them.
- Finally, click on the Validate JavaScript button to validate the final code.
Additional Features:
- Validators: On this website, users also get additional code validators such as JSON, XML, CSS, and HTML.
- Beautify Tools: It offers code beautification tools like JAVA beautifier, JSON beautifier, CSS Beautifier, etc.
- Encode & Decode Tools: This section offers encoding and decoding tools such as MD5 Hash Generator, SHA-1 Hash Generator, SHA3-512 Hash Generator, etc.
Final Thoughts:
It is another good online JavasScript validator that can detect and locate errors in JavaScript codes.
| Pros | Cons |
|---|---|
| Can detect and locate errors | |
| Supports syntax highlighting |
lambdatest.com
lambdatest.com is another free online JavaScript validator website. This website provides a Javascript validator & Linter tool. Through this tool, users can find out all the errors and warnings on their JavaScript code. Users can also easily fix the detected errors and validate their code. Although, it lacks syntax highlighting, unlike most other similar websites. Now, follow the below steps.
How to perform JavaScript validation online using lambdatest.com:
- Go to this website using the given tools.
- After that, enter the JS code in the input field.
- Now, correct the detected errors.
- Finally, click on the Validator button.
Additional Features:
- A good set of additional tools like Code Tidy, Data Format, Random Data, Hash Mac Generator, CRC32B Hash Calculator, etc., are also present.
Final Thoughts:
It is another good online JavaScript validator website that users can try.
| Pros | Cons |
|---|---|
| Can detect and locate errors | Lacks syntax highlight feature |
htmlstrip.com
htmlstrip.com is another free online JavaScript validator website. Through this JavaScript validator website, users can find out errors and warnings present on a piece of JavaScript code. It also shows the line of error and provides a description of each detected error so that users can quickly fix them. Once all errors are resolved, users can validate the JavaScript code. Now, follow the below steps.
How to perform JavaScript validation online using htmlstrip.com:
- Visit this website and choose the JavaScript Validator section.
- Now, enter the JavaScript code in the input field.
- Next, click on the Validat button to view errors, if detected any.
- After fixing all the errors, click on the Validate button again and copy the final code.
Additional Features:
- This website also offers additional online tools like Code Beautifier, CSS Generators, Random Generators, Meta Tags Generator, Redirect Generator, and more.
Final Thoughts:
It is another good online JavaScript validator website that anyone can use to quickly validate JavaScript code.
| Pros | Cons |
|---|---|
| Can detect and locate errors | Lacks syntax highlight feature |
| describes each detected error |
bfotool.com
bfotool.com is another free online JavaScript validator website. It is another good website that offers a simple JavaScript validator tool. This tool allows users to write and detect errors in the JavaScript code. It highlights the code lines which contain errors for quick rectification. It also shows the column of errors along with the error description. A good set of common queries related to JavaScript validation are also answered by it. Now, follow the below steps.
How to perform JavaScript validation online using bfotool.com:
- Go to this website using the given link.
- After that, enter the JS code in the panel.
- Now, view and fix the detected errors in the JS code.
- Finally, click on the Validate Code button.
Additional Features:
- This website also contains additional tools like HTML Tester, SQL to Text, Resize Video, SCSS to CSS, SQL to Text, and more.
Final Thoughts:
It is another good online JavaScript validator website that allows users to validate all types of JS codes.
| Pros | Cons |
|---|---|
| Can detect and locate errors | |
| Supports syntax highlighting |
jslint.com
jslint.com is another free online JavaScript validator website. It is mainly a JavaScript lint website that can detect errors and mistakes in the input JS code. It immediately highlights all the mistakes so that users can quickly fix. It even describes the type of mistakes and detected warnings. It even shows all the Functions used in the code under its Report: Function section. After fixing all the detected mistakes, users can copy the final validated JS code. Now, follow the below steps.
How to perform JavaScript validation online using jslint.com:
- Go to this website using the given link.
- After that, enter or paste the JS code
- Next, view and fix the detected errors for the validation.
- Finally, copy the error-free JS code from its interface.
Final Thoughts:
It is another good online Javascript validator website that helps users quickly detect and fix errors in the code.
| Pros | Cons |
|---|---|
| It helps users detect and fix errors | |
| Supports syntax highlighting |
commontools.org
commontools.org is another free online JavaScript validator website. This website comes with a dedicated Javascript Validator tool. This tool allows users to directly write or paste the JS code. After entering the JS code, users can use the Validate Javascript option to view if there are any errors and warnings present in the code or not. If it finds errors, then it shows a line, column, and description of both errors and warnings. It also answers all the common queries related to Javascript validation. Now, follow the below steps.
How to perform JavaScript validation online using commontools.org:
- Start this website and access the JavaScript Validator tool.
- After that, enter the JS code.
- Next, click on the Validate javascript button to view all the errors and warnings.
- Finally, fix the detected errors and again validate the code.
Additional Features:
- This website also has handy online tools like Compare Code, Word to HTML Javascript Beautifier, HTML Formatter, CSS Beautifier, etc.
Final Thoughts:
It is another capable online JavaScript validator website that anyone can use without much hassle to validate their JS codes.
| Pros | Cons |
|---|---|
| Describes detected errors | |
| Answers common queries related to JS validation |
browserling.com
browserling.com is the last free online JavaScript validator website. This website offers one of the most basic JavaScript validator tools. This tool can validate the JavaScript code if it didn’t detect any errors. Although, it doesn’t highlight the type and line of errors that significantly increase the time to detect errors by users. It also doesn’t support syntax highlighting. Now, follow the below steps.
How to perform JavaScript validation online using browserling.com:
- Visit this website and open up the Validate JavaScripty section.
- After that, write or paste the JavaScript code.
- Next, click on the JS validate button to check for potential errors.
- If no errors are detected, your code will get validated.
Additional Features:
- This website also comes with additional online tools like URL Encoder, URL Parser, HTML Encoder, HTML Decoder, JSON Minifier, XML to YAML Converter, CSV Column Swapper, etc.
Final Thoughts:
It is a basic online JavaScript validator website that can validate JavaScript code but cannot detect the location of errors and type of errors.
| Pros | Cons |
|---|---|
| Cannot detect the error location | |
| Doesn’t support syntax highlighting |
Frequently Asked Questions
You can use above mentioned online JavaScript validator websites to quickly validate your JavaScript code. Some of these websites can also highlight the line, column, and description of the detected errors. Plus, users can also validate JS files present on online sources using their URL links.
JavaScript validation refers to the process of validating user input or data entered into a web form or application using JavaScript code. It ensures that the input meets specific criteria, such as format, length, or data type, before it is submitted to the server or processed further.
Code validation refers to the process of verifying the quality, correctness, and adherence to coding standards of a piece of code. It involves checking the code for potential errors, bugs, security vulnerabilities, and compliance with established coding practices and guidelines.
Naveen Kushwaha
Passionate about tech and science, always look for new tech solutions that can help me and others.
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