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The JSON Online Test uses scenario-based MCQs to evaluate candidates' ability to create and parse JSON (JavaScript Object Notation) data, as well as their understanding of data structures, encoding, and decoding. Other key skills that the test evaluates include JavaScript programming, web development, data serialization, RESTful APIs, and data exchange between different programming languages.

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Screen candidates with a 25 mins test

Test duration:  ~ 25 mins
Difficulty level:  Moderate
Availability:  Available as custom test
  • 10 JSON MCQs
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Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Use the JSON Assessment Test to shortlist qualified candidates

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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Screen candidates with the highest quality 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


JSON Schema: Pick valid data
Consider the following JSON Schema specification:

  "type": "object",
    { "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",
                      { "type": "object",
                        "properties": {"User":
                                       {"type": "string", "optional": true},
                                       {"type": "integer", "minimum":1,
      "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.
{ "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 }
{ "ProductId": "Product123",
  "ProductName": "desk",
  "Price": 50,
  "Shippers": ["Amy","Pond"],
  "Favourites": [ ],
  "AvgScore": 3.33,
  "FreeCancellation": true }
{ "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 }
{ "ProductId": "123",
  "ProductName": "desk",
  "Price": 50,
  "Shippers": ["Amy","Pond"],
  "Favourites": {"User":"Amy", "Score":5},
  "AvgScore": 3.33,
  "FreeCancellation": true }
🧐 Question🔧 Skill


JSON Schema: Pick valid data

4 mins

🧐 Question🔧 Skill💪 Difficulty⌛ Time
JSON Schema: Pick valid data
Easy4 mins

Test candidates on core JSON Hiring Test topics

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.

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Have questions about the JSON Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours 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. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

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.

What roles can I use the JSON Assessment Test for?

Here are few roles for which we recommend this test:

  • Software Developer
Can I see a sample test, or do you have a free trial?


The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

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.

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.

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