Author: John Au-Yeung

Sometimes, we want to fix JSON.parse unexpected token s error with JavaScript.

In this article, we’ll look at how to fix JSON.parse unexpected token s error with JavaScript.

How to fix JSON.parse unexpected token s error with JavaScript?

To fix JSON.parse unexpected token s error with JavaScript, we should make sure strings are in double quotes.

For instance, we write

const s = '"something"';
const result = JSON.parse(s);

to wrap ‘something’ in double quotes to make it a valid JSON string.

Then we call JSON.parse with s to parse it into a JavaScript string.

Conclusion

To fix JSON.parse unexpected token s error with JavaScript, we should make sure strings are in double quotes.

Sometimes, we want to define a regular expression to match exactly 5 digits with JavaScript.

In this article, we’ll look at how to define a regular expression to match exactly 5 digits with JavaScript.

How to define a regular expression to match exactly 5 digits with JavaScript?

To define a regular expression to match exactly 5 digits with JavaScript, we can use the \d pattern.

For instance, we write

const str = "f 34 545 323 12345 54321 123456";
const matches = str.match(/\b\d{5}\b/g);

console.log(matches);

to define the /\b\d{5}\b/g pattern that matches groups of 5 digits.

\b matches word bounddaries.

And \d{5} matches 5 digits.

Then we call str.match with the regex to return an array of all matches.

Conclusion

To define a regular expression to match exactly 5 digits with JavaScript, we can use the \d pattern.

To find the length or size of an array in JavaScript, we use the length property.

For instance, we write

const arr = [];
testvar[1] = 2;
testvar[2] = 3;
console.log(arr.length);

to define the arr array.

And we set values for indexes 1 and 2.

Finally, we get the array size or length with the arr.length property.

To submit form using an a tag with JavaScript, we can call the form’s submit method.

For instance, we write

<form name="myForm" action="handle-data.php">
  Search: <input type="text" name="query" />
  <a href="javascript: submitform()">Search</a>
</form>

to add a form.

Then we write

function submitform() {
  document.myForm.submit();
}

to define the submitForm function which we set as the value of the href attribute of the a element.

In it, we get the by its name with document.myForm.

And then we call submit to submit the form.

Conclusion

To submit form using an a tag with JavaScript, we can call the form’s submit method.