JSON Test

Q: What are the main Frontend Developer tests?

Some important frontend developer tests include: JavaScript Online Test HTML/CSS Online Test React.js Online Test

The JSON Test evaluates a candidate's proficiency in JSON syntax and structure, parsing and serialization, and handling JSON in various programming contexts. Using scenario-based MCQ questions, it assesses knowledge of data types, schemas, and validation, among other advanced JSON topics. The test is designed to screen for essential skills needed to work efficiently with JSON in software development roles.

Covered skills:

JSON Syntax and Structure
Parsing and Serialization
Data Types and Values
JSON Schema
JSON Validation
Handling JSON in JavaScript
JSON in REST APIs
Error Handling
Advanced JSON Concepts
Performance Optimization with JSON
Security Considerations
Interoperability

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About the JSON Assessment Test

The JSON Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Understanding the basics of JSON syntax and structure
Ability to parse and manipulate JSON data
Knowledge of JSON schema validation
Experience with serializing and deserializing JSON
Understanding JSONP and CORS concepts
Ability to handle nested JSON structures
Knowledge of JSON web tokens (JWT)
Familiarity with JSON-RPC protocol
Experience with working with RESTful JSON APIs
Ability to validate and format JSON using tools like JSONLint

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Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this JSON Test will be non-googleable.

🧐 Question
Easy JSON Schema: Pick valid data Json Schema Validation Data Validation	Solve
Consider the following JSON Schema specification: { "type": "object", "properties": { "ProductID": { "type":"string", "pattern":"Product*" }, "ProductName": { "type":"string" }, "Price": { "type":"integer", "minimum":20, "maximum":200 }, "Shippers": { "type":"array", "maxItems":4, "items": { "type":"string" }}, "Favourites": { "type":"array", "items": { "type": "object", "properties": {"User": {"type": "string", "optional": true}, "Rating": {"type": "integer", "minimum":1, "maxiumum":10}}}}, "AvgScore": { "type":"number", "optional":true }, "FreeCancellation": {"type":"boolean" } } } Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above. OPTION A: { "ProductId": "Product123", "ProductName": "desk", "Price": "50", "Shippers": ["Amy","Pond"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION B: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": [ ], "AvgScore": 3.33, "FreeCancellation": true } OPTION C: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy Pond","Doctor Strange","Will","Clara Oswald", "Minnesota"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION D: { "ProductId": "123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": {"User":"Amy", "Score":5}, "AvgScore": 3.33, "FreeCancellation": true }

🧐 Question

Easy

JSON Schema: Pick valid data

Json Schema Validation

Data Validation

Solve

Consider the following JSON Schema specification:

{
"type": "object",
"properties":
{ "ProductID": { "type":"string", "pattern":"Product*" },
"ProductName": { "type":"string" },
"Price": { "type":"integer", "minimum":20, "maximum":200 },
"Shippers": { "type":"array", "maxItems":4,
"items": { "type":"string" }},
"Favourites": { "type":"array",
"items":
{ "type": "object",
"properties": {"User":
{"type": "string", "optional": true},
"Rating":
{"type": "integer", "minimum":1,
"maxiumum":10}}}},
"AvgScore": { "type":"number", "optional":true },
"FreeCancellation": {"type":"boolean" }
}
}

Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above.

OPTION A:
{ "ProductId": "Product123",
"ProductName": "desk",
"Price": "50",
"Shippers": ["Amy","Pond"],
"Favourites": [{"User":"Eleven", "Score":5}, {"Score":1},
{"User":"Mandosa", "Score":4}],
"AvgScore": 3.33,
"FreeCancellation": true }

OPTION B:
{ "ProductId": "Product123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": [ ],
"AvgScore": 3.33,
"FreeCancellation": true }

OPTION C:
{ "ProductId": "Product123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy Pond","Doctor Strange","Will","Clara Oswald", "Minnesota"],
"Favourites": [{"User":"Eleven", "Score":5}, {"Score":1},
{"User":"Mandosa", "Score":4}],
"AvgScore": 3.33,
"FreeCancellation": true }

OPTION D:
{ "ProductId": "123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": {"User":"Amy", "Score":5},
"AvgScore": 3.33,
"FreeCancellation": true }

	🧐 Question	🔧 Skill
	Easy JSON Schema: Pick valid data Json Schema Validation Data Validation	4 mins JSON	Solve
Consider the following JSON Schema specification: { "type": "object", "properties": { "ProductID": { "type":"string", "pattern":"Product*" }, "ProductName": { "type":"string" }, "Price": { "type":"integer", "minimum":20, "maximum":200 }, "Shippers": { "type":"array", "maxItems":4, "items": { "type":"string" }}, "Favourites": { "type":"array", "items": { "type": "object", "properties": {"User": {"type": "string", "optional": true}, "Rating": {"type": "integer", "minimum":1, "maxiumum":10}}}}, "AvgScore": { "type":"number", "optional":true }, "FreeCancellation": {"type":"boolean" } } } Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above. OPTION A: { "ProductId": "Product123", "ProductName": "desk", "Price": "50", "Shippers": ["Amy","Pond"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION B: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": [ ], "AvgScore": 3.33, "FreeCancellation": true } OPTION C: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy Pond","Doctor Strange","Will","Clara Oswald", "Minnesota"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION D: { "ProductId": "123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": {"User":"Amy", "Score":5}, "AvgScore": 3.33, "FreeCancellation": true }

🧐 Question

🔧 Skill

Easy

JSON Schema: Pick valid data

Json Schema Validation

Data Validation

4 mins

JSON

Solve

Consider the following JSON Schema specification:

Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above.

OPTION B:
{ "ProductId": "Product123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": [ ],
"AvgScore": 3.33,
"FreeCancellation": true }

OPTION D:
{ "ProductId": "123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": {"User":"Amy", "Score":5},
"AvgScore": 3.33,
"FreeCancellation": true }

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	JSON Schema: Pick valid data Json Schema Validation Data Validation	JSON	Easy	4 mins	Solve
Consider the following JSON Schema specification: { "type": "object", "properties": { "ProductID": { "type":"string", "pattern":"Product*" }, "ProductName": { "type":"string" }, "Price": { "type":"integer", "minimum":20, "maximum":200 }, "Shippers": { "type":"array", "maxItems":4, "items": { "type":"string" }}, "Favourites": { "type":"array", "items": { "type": "object", "properties": {"User": {"type": "string", "optional": true}, "Rating": {"type": "integer", "minimum":1, "maxiumum":10}}}}, "AvgScore": { "type":"number", "optional":true }, "FreeCancellation": {"type":"boolean" } } } Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above. OPTION A: { "ProductId": "Product123", "ProductName": "desk", "Price": "50", "Shippers": ["Amy","Pond"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION B: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": [ ], "AvgScore": 3.33, "FreeCancellation": true } OPTION C: { "ProductId": "Product123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy Pond","Doctor Strange","Will","Clara Oswald", "Minnesota"], "Favourites": [{"User":"Eleven", "Score":5}, {"Score":1}, {"User":"Mandosa", "Score":4}], "AvgScore": 3.33, "FreeCancellation": true } OPTION D: { "ProductId": "123", "ProductName": "desk", "Price": 50, "Shippers": ["Amy","Pond"], "Favourites": {"User":"Amy", "Score":5}, "AvgScore": 3.33, "FreeCancellation": true }

🧐 Question

🔧 Skill

💪 Difficulty

⌛ Time

JSON Schema: Pick valid data

Json Schema Validation

Data Validation

JSON

Easy

4 mins

Solve

Consider the following JSON Schema specification:

Select, from the choices below, the JSON data that is valid according to the JSON Schema specification above.

OPTION B:
{ "ProductId": "Product123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": [ ],
"AvgScore": 3.33,
"FreeCancellation": true }

OPTION D:
{ "ProductId": "123",
"ProductName": "desk",
"Price": 50,
"Shippers": ["Amy","Pond"],
"Favourites": {"User":"Amy", "Score":5},
"AvgScore": 3.33,
"FreeCancellation": true }

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Why you should use Pre-employment JSON Test?

The JSON Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Understanding and working with JSON data structures
Parsing and manipulating JSON data
Creating and modifying JSON objects
Validating JSON data
Serializing and deserializing JSON

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the JSON Test?

JSON: JSON (JavaScript Object Notation) is a lightweight data interchange format commonly used for transmitting data between a server and a web application. It is based on JavaScript syntax and provides a way to structure and represent data in a readable and organized manner. JSON is widely used in web development due to its simplicity, compatibility with different programming languages, and ease of parsing and generating data.

Test Automation: Test automation refers to the process of using automated tools and scripts to execute tests on software applications. It involves writing code to replicate manual test cases and perform them automatically, allowing for faster and more reliable testing. Test automation is a crucial skill to be measured in this test as it ensures the efficiency and accuracy of the assessment platform by validating its functionalities and identifying any potential issues or bugs.

Data Manipulation: Data manipulation involves techniques and operations used to modify, transform, and analyze data. This skill includes understanding and applying various programming concepts and functions to process and manipulate data, such as filtering, sorting, joining, and aggregating. Data manipulation is an essential skill to be measured in this test as it assesses the candidate's ability to work with JSON data, perform data transformations, and extract meaningful insights from the provided data.

Error Handling: Error handling refers to strategies and practices implemented to detect, handle, and resolve errors or exceptions that occur during the execution of a program. This skill involves understanding different types of errors, identifying potential sources of errors, and implementing proper error handling techniques to ensure graceful degradation and maintain the stability and reliability of the software. Measuring error handling in this test helps evaluate the candidate's ability to write robust and fault-tolerant code, improving the overall quality of the assessment platform.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for JSON Test to be based on.

JSON syntax

JSON structure

JSON parsing

JSON manipulation

JSON schema validation

Serialization and deserialization of JSON

JSONP (JSON with padding)

CORS (Cross-Origin Resource Sharing)

Nested JSON structures

JSON web tokens (JWT)

JSON-RPC protocol

Working with RESTful JSON APIs

JSON validation

JSON formatting

JSON processing

JSON encoding

JSON decoding

JSON to XML conversion

XML to JSON conversion

JSON compression

JSON pretty-printing

JSON merging

JSON filtering

JSON file I/O

JSON data extraction

JSON data transformation

JSON data migration

JSON data querying

JSON data aggregation

JSON data sorting

JSON data pagination

JSON data validation

JSON data manipulation

JSON data serialization

JSON data deserialization

JSON data binding

JSON data mapping

JSON data modeling

JSON data visualization

JSON data storage

JSON data retrieval

JSON data caching

JSON data synchronization

JSON data encryption

JSON data migration

JSON data replication

JSON data transformation

JSON data extraction

JSON data compression

JSON data filtering

JSON data serialization

JSON data deserialization

JSON data streaming

JSON web services

What roles can I use the JSON Test for?

Frontend Developer
Backend Developer
Full Stack Developer
Data Scientist
Software Engineer
Mobile App Developer
API Developer
Data Analyst
DevOps Engineer
Web Developer

How is the JSON Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Handling JSON errors and exceptions
Working with nested JSON objects
Performing JSON data transformations
Using JSON schema for data validation
Accessing and modifying JSON APIs

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Have questions about the JSON Hiring Test?

What is JSON Test - json-online-test?

The JSON Test evaluates candidates' proficiency in JSON concepts. It's used by recruiters to assess skills related to JSON Syntax, Parsing, Serialization, and more.

Can I combine JSON Test with JavaScript questions?

Yes, recruiters can request a custom test that includes both JSON and JavaScript questions. Check the JavaScript Online Test for details on assessing JavaScript skills.

What topics are evaluated in the JSON Test?

The test covers JSON Syntax and Structure, Parsing and Serialization, Data Types, JSON Schema, Validation, Handling JSON in JavaScript, REST APIs, Error Handling, Advanced Concepts, Performance Optimization, Security Considerations, and Interoperability.

How to use JSON Test in my hiring process?

Use the JSON Test as a pre-screening tool. Add a link to the assessment in your job posting or invite candidates by email.

Can I test JSON and REST APIs together in a test?

Yes, you can test JSON and REST APIs together. It is recommended to combine these skills for comprehensive assessment. Check the JavaScript, HTML/CSS & NodeJS Test for more information.

What are the main Frontend Developer tests?

Some important frontend developer tests include:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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