Syntaxerror: unexpected end of json input

Syntaxerror: unexpected end of json input

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The syntaxerror: unexpected end of json input is an error message you’ll encounter when you are working with JavaScript.

If you are encountering this error right now and you’re confused about how to fix this, then continue reading!

This article will explore the uncaught syntaxerror unexpected end of json input, and you’ll understand why this error occurs.

What is “syntaxerror unexpected end of json input”?

The syntaxerror: unexpected end of json input occurs when you are trying to parse a JSON (JavaScript Object Notation). However, it is incomplete, invalid, or not properly formatted.

This error indicates that the JavaScript interpreter encountered an issue while parsing JSON data.

In addition to that, it is a common error message that occurs when there is a missing or incomplete JSON object or array in your code.

What is JSON?

JSON or JavaScript Object Notation, is a popular data format used for storing and exchanging information between a client and a server.

Why does “unexpected end of json input” error occur?

The uncaught syntaxerror unexpected end of json input error typically occurs when parsing JSON data if the JSON input ends abruptly or lacks proper closing brackets, braces, or missing or extra character, such as a comma or quotation mark.

JavaScript encounters an unexpected end of the JSON input, triggering the syntax error.

Additionally, here are the following factors that also the reason for this error include:

❌ Improperly formatted JSON data.

❌ Truncated or incomplete JSON data.

❌ Network issues that cause the JSON data to be incomplete when it is received

The are the scenarios wherein you’ll encounter this error at the same we included its solution.

Scenario 1: Missing Closing Bracket

For example:


const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free sourcecode and tutorial"';
const parsedData = JSON.parse(jsonData);


Here, the closing bracket (}) is missing at the end of the JSON object. As a result, parsing the JSON data will throw a syntax error.

To fix this error, you have to make sure that you provide the complete JSON object by adding the missing closing bracket.

Corrected code:

✅ const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free sourcecode and tutorial"}';
const parsedData = JSON.parse(jsonData);

Scenario 2: Missing closing quotation mark

const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free sourcecode and tutorial'; const parsedData = JSON.parse(jsonData);

In this scenario, the closing quotation mark (“) is missing after the value of the “offer” key. It leads to an invalid JSON syntax and triggers that result in syntax errors.

To fix this error, make sure that you include the closing quotation mark in the JSON string.

Corrected code:

✅ const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free sourcecode and tutorial"}';
const parsedData = JSON.parse(jsonData);

Scenario 3: Invalid Escape Sequence

For example:


const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free source\ncode and tutorial"}';
const parsedData = JSON.parse(jsonData);


In this scenario, an invalid escape sequence (\n) is used within the string value of the “offer” key. It causes the JSON data to be improperly formatted and results to syntaxerror.

To resolve this, use the correct escape sequence (\n) to represent a newline character within the JSON string.

Corrected code:


✅ const jsonData = '{"website": "Itsourcecode", "visitors": 100000, "offer": "free source\\ncode and tutorial"}';
const parsedData = JSON.parse(jsonData);

Scenario 4: Invalid JSON Structure

const jsonData = 'Caren, 18, "Writer"';
const parsedData = JSON.parse(jsonData);


As you can see, the provided data is not a valid JSON object or array. It lacks the necessary enclosing brackets or braces, leading to the syntax error.

To fix this, ensure that you provide a valid JSON structure by enclosing the data in curly braces {} for an object or square brackets [] for an array.

Corrected code:

✅ const jsonData = '{"name": "Caren", "age": 18, "job": "writer"}';
const parsedData = JSON.parse(jsonData);

How to fix the “syntaxerror: unexpected end of json input”?

To fix the syntaxerror unexpected end of JSON input error, you can try to execute the following steps:

✅ Verify the JSON data for missing or extra characters such as commas or quotation marks.

✅ Ensure the JSON data is properly formatted. You can use an online JSON validator to check the formatting of your data.

✅ Make sure that the JSON data is complete and not truncated. If you are receiving the data from a network request, make sure that the request is successful and that all of the data is received.

✅ Confirm that you are using the correct data types for the values in your JSON. Strings should be enclosed in double quotation marks, numbers should be represented without quotes, and arrays and objects should be formatted correctly.

Conclusion

In conclusion, the error message syntaxerror: unexpected end of json input occurs when you are trying to parse a JSON (JavaScript Object Notation). However, it is incomplete, invalid, or not properly formatted.

We already discussed above what this error is all about and multiple ways to resolve this error.

By executing the solutions above, you can master this Syntaxerror in Python with the help of this guide.

You could also check out other “SyntaxError” articles that may help you in the future if you encounter them.

We are hoping that this article helps you fix the error. Thank you for reading itsourcecoders 😊

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