Javascript test script online

Javascript Validator

Use Online Javascript Validator to validate javascript code and find errors and warnings of your code that can be fixed. See real time code validation and fix errors and warnings of your code as you type. After coding is complete, format your javascript code.

Options

• CSS Beautifier
• CSS Minifier
• HTML Beautifier
• HTML Minifier
• Javascript Beautifier
• Javascript Minifier
• Javascript Obfuscator
• JSON Beautifier
• JSON Minifier
• OPML Beautifier
• OPML Minifier
• PHP Beautifier
• XML Beautifier
• XML Minifier

• Acceleration Converter
• Area Converter
• Density & Mass Capacity Converter
• Digital Storage Converter
• Electricity Converter
• Energy Converter
• Force Converter
• Force / Length Converter
• Length Converter
• Light Converter
• Mass Converter
• Mass Flow Converter
• Power Converter
• Pressure & Stress Converter
• Temperature Converter
• Time Converter
• Torque Converter
• Velocity & Speed Converter
• Viscosity Converter
• Volume & Capacity Converter
• Volume Flow Converter

• CSV To HTML Converter
• CSV To JSON Converter
• CSV To Multi Line Data Converter
• CSV To SQL Converter
• CSV To XML Converter
• CSV To XML / JSON Converter
• Excel To CSV Converter
• Excel To Formula View
• Excel To Html Converter
• Excel To Json Converter
• Excel To SQL Converter
• HTML Table To CSV Converter
• HTML Table To JSON Converter
• HTML Table To Multi Line Data Converter
• HTML Table To SQL Converter
• HTML Table To XML Converter
• JSON To CSV Converter
• JSON To HTML TABLE Converter
• JSON To XML Converter
• JSON To YAML Converter
• OPML To JSON Converter
• RSS To JSON Converter
• SQL To CSV Converter
• SQL To HTML Converter
• SQL To JSON Converter
• SQL To XML Converter
• SQL To YAML Converter
• XML To CSV Converter
• XML To JSON Converter
• XML To YAML Converter
• YAML To XML / JSON / CSV Converter

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Javascript Tester

Javascript tester — online javascript tester for editing and testing your javascript code snippets.

Use the javascript tester to quickly test your javascript functions and code. For more complex testing of code/html/css use something like CodePen or JSFiddle.

The javascript tester will highlight syntax errors in the editor and provide meaningful messages to help debug your code. Runtime errors are shown below the editor.

Result of evaluating code:

The tester will evaluate your code and print the result to result section under the editor. The basic idea is you enter snippets of code you want to test with. The last expression will get printed as a result. The last expression should not contain a «return» statement or a variable assignment. It should just be an expression. You can also add additional console.log messages at various points in you code and these will also be shown in the result section on this page.

const dogs = [ , , ]; dogs.map(dog => dog.name); 

Great for testing ideas or running simple code snippets.

This editor works entirely in your browser (it uses the Ace embeddable code editor.). Your code is not sent to any server. If you close the browser or tab the current state of the edior is saved. If you don’t want you code saved remember to clear the editor before closing. We value Privacy!

See below for keyboard shortcuts

Features

• Syntax highlighting
• Automatic indent and outdent
• Live syntax checking
• Handles large documents
• Search and replace with regular expressions (Ctrl-F)
• Highlight matching parentheses
• Drag and drop text using the mouse
• Line wrapping
• Code folding
• Multiple cursors and selections
• Cut, copy, and paste functionality

The following video gives some color theory basics to help you with your selections.

Editor Keyboard Shortcuts

Line Operations

Windows/Linux	Mac	Action
Ctrl-D	Command-D	Remove line
Alt-Shift-Down	Command-Option-Down	Copy lines down
Alt-Shift-Up	Command-Option-Up	Copy lines up
Alt-Down	Option-Down	Move lines down
Alt-Up	Option-Up	Move lines up
Alt-Delete	Ctrl-K	Remove to line end
Alt-Backspace	Command-Backspace	Remove to linestart
Ctrl-Backspace	Option-Backspace, Ctrl-Option-Backspace	Remove word left
Ctrl-Delete	Option-Delete	Remove word right
—	Ctrl-O	Split line

Selection

Windows/Linux	Mac	Action
Ctrl-A	Command-A	Select all
Shift-Left	Shift-Left	Select left
Shift-Right	Shift-Right	Select right
Ctrl-Shift-Left	Option-Shift-Left	Select word left
Ctrl-Shift-Right	Option-Shift-Right	Select word right
Shift-Home	Shift-Home	Select line start
Shift-End	Shift-End	Select line end
Alt-Shift-Right	Command-Shift-Right	Select to line end
Alt-Shift-Left	Command-Shift-Left	Select to line start
Shift-Up	Shift-Up	Select up
Shift-Down	Shift-Down	Select down
Shift-PageUp	Shift-PageUp	Select page up
Shift-PageDown	Shift-PageDown	Select page down
Ctrl-Shift-Home	Command-Shift-Up	Select to start
Ctrl-Shift-End	Command-Shift-Down	Select to end
Ctrl-Shift-D	Command-Shift-D	Duplicate selection
Ctrl-Shift-P	—	Select to matching bracket

Multicursor

Windows/Linux	Mac	Action
Ctrl-Alt-Up	Ctrl-Option-Up	Add multi-cursor above
Ctrl-Alt-Down	Ctrl-Option-Down	Add multi-cursor below
Ctrl-Alt-Right	Ctrl-Option-Right	Add next occurrence to multi-selection
Ctrl-Alt-Left	Ctrl-Option-Left	Add previous occurrence to multi-selection
Ctrl-Alt-Shift-Up	Ctrl-Option-Shift-Up	Move multicursor from current line to the line above
Ctrl-Alt-Shift-Down	Ctrl-Option-Shift-Down	Move multicursor from current line to the line below
Ctrl-Alt-Shift-Right	Ctrl-Option-Shift-Right	Remove current occurrence from multi-selection and move to next
Ctrl-Alt-Shift-Left	Ctrl-Option-Shift-Left	Remove current occurrence from multi-selection and move to previous
Ctrl-Shift-L	Ctrl-Shift-L	Select all from multi-selection

Go to

Windows/Linux	Mac	Action
Left	Left, Ctrl-B	Go to left
Right	Right, Ctrl-F	Go to right
Ctrl-Left	Option-Left	Go to word left
Ctrl-Right	Option-Right	Go to word right
Up	Up, Ctrl-P	Go line up
Down	Down, Ctrl-N	Go line down
Alt-Left, Home	Command-Left, Home, Ctrl-A	Go to line start
Alt-Right, End	Command-Right, End, Ctrl-E	Go to line end
PageUp	Option-PageUp	Go to page up
PageDown	Option-PageDown, Ctrl-V	Go to page down
Ctrl-Home	Command-Home, Command-Up	Go to start
Ctrl-End	Command-End, Command-Down	Go to end
Ctrl-L	Command-L	Go to line
Ctrl-Down	Command-Down	Scroll line down
Ctrl-Up	—	Scroll line up
Ctrl-P	—	Go to matching bracket
—	Option-PageDown	Scroll page down
—	Option-PageUp	Scroll page up

Find/Replace

Windows/Linux	Mac	Action
Ctrl-F	Command-F	Find
Ctrl-H	Command-Option-F	Replace
Ctrl-K	Command-G	Find next
Ctrl-Shift-K	Command-Shift-G	Find previous

Folding

Windows/Linux	Mac	Action
Alt-L, Ctrl-F1	Command-Option-L, Command-F1	Fold selection
Alt-Shift-L, Ctrl-Shift-F1	Command-Option-Shift-L, Command-Shift-F1	Unfold
Alt-0	Command-Option-0	Fold all
Alt-Shift-0	Command-Option-Shift-0	Unfold all

Other

Windows/Linux	Mac	Action
Tab	Tab	Indent
Shift-Tab	Shift-Tab	Outdent
Ctrl-Z	Command-Z	Undo
Ctrl-Shift-Z, Ctrl-Y	Command-Shift-Z, Command-Y	Redo
Ctrl-,	Command-,	Show the settings menu
Ctrl-/	Command-/	Toggle comment
Ctrl-T	Ctrl-T	Transpose letters
Ctrl-Enter	Command-Enter	Enter full screen
Ctrl-Shift-U	Ctrl-Shift-U	Change to lower case
Ctrl-U	Ctrl-U	Change to upper case
Insert	Insert	Overwrite
Ctrl-Shift-E	Command-Shift-E	Macros replay
Ctrl-Alt-E	—	Macros recording
Delete	—	Delete
—	Ctrl-L	Center selection

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JavaScript Validator

Javascript Validator is easy to use tool to validate JavaScript code. Copy, Paste and Validate JavaScript.

This JS linter checks the js code and highlights errors as well as shows the detail of the error in a plain and easy-to-read gradient table.

What can you do with JS Validator?

• It helps to Validate JavaScript code.
• It also works as JS Checker or JavaScript syntax checker.
• This tool allows loading the JavaScript URL to validate. Use your JS HTTP / HTTPS URL to validate. Click on the Load URL button, Enter URL and Submit.
• Users can also validate JS File by uploading the file.
• It helps to save your validated JavaScript and Share it on social sites or emails.
• JS Validator works well on Windows, MAC, Linux, Chrome, Firefox, Edge, and Safari.
• This JavaScript Linter helps a developer who works with JS code to test and verify.

How to validate JavaScript code or file?

1. Open JS Validator tool and Copy and Paste JS Code in Input Text Editor.
2. If you do have a JavaScript file, you can upload the file using the Upload file button. Users can also upload a js file with an internet-accessible URL. Click on the URL Button and Paste the URL.
3. Click on Validate JS button once js script data is available in Text Editor, via Paste, File, or URL
4. Review errors and warnings after parsing the JavaScript in the Error Section.

How does JS Validation work?

JS Validator uses JavaScript libs for validating and presenting warnings and errors. It process and validates js in a browser environment.

Just Paste your JS code and click Validate JS. This tool does not send js code to the server for validating.

In the case of js file upload, Browser reads the file and for URL upload, it sends the javascript URL to server and return js data and then run the validation logic.

Know more about JavaScript:

Example of JS File

var carInsuranceCompany = < name: "Geico", market_capital: "$34.9 billion", >; var carInsuranceCompanyObj = JSON.stringify(obj); document.getElementById("insurance").innerHTML = carInsuranceCompanyObj;

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JavaScript validator

JavaScript validator allows to test and validate JavaScript online, and find JavaScript errors easily and quickly. This JavaScript code checker tool highlights and allows to navigate between lines with syntax error. To check your code, you must copy and paste, drag and drop a .js file or directly type in the «JavaScript» online editor below, and click on «Check JavaScript syntax» button.

This tool also is a JavaScript fiddle, you can fill html, CSS and JavaScript editors in order to run your source directly in your browser. You can see the user guide to help you to use this JavaScript fiddle tool.

User guide

• First, Drag and drop your JavaScript file or copy / paste your JavaScript text directly into the editor above.
• Finally, you must click on «Check JavaScript syntax» button to display if there is an syntax error in your code.

To run and execute your JavaScript code in your browser, it is analogous to the check js syntax, except that you must click on «RUN fiddle» button.

To share your code, You must only click on «SHARE fiddle» button (And choice a password)!

JavaScript checker

JavaScript Validator Online tool allows to find syntax errors (lint). If a syntax error is detected, then the line in error is highlighted.

This linter allows to report stylistic errors, it can improve the quality of the code. It can also signal suspicious constructs, avoid mistakes, and potentially dangerous things.

JavaScript fiddle

You can test your JavaScript code online directly in your browser and share it!

You just have to share the URL of your fiddle in order to share it. Your JS fiddle will be accessible to everyone, do not save sensitive data! The password is only used to protect its modification.

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