Read a JSON Object and Its Types
Read the exact key and distinguish its stated value type.
About 22 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
JSON represents objects, arrays and primitive values with defined syntax. An object maps text keys to values. Quoted digits are text rather than a numeric quantity. The supplied data is a small original object; parsing it does not imply its fields satisfy an application’s business rules.
Read the exact key and distinguish its stated value type. Valid JSON syntax is different from a valid application record.
Use this supplied case: Value at id. Object: {"id":"007","count":5,"done":true,"tags":["red","blue"]}. Which value type is requested? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Read the exact key and distinguish its stated value type.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Value at id. Object: {"id":"007", "count":5, "done": true, "tags":["red", "blue"]}. Which value type is requested? The supported answer is Text. Read the exact key and distinguish its stated value type. Valid JSON syntax is different from a valid application record. JSON represents objects, arrays and primitive values with defined syntax. The supplied facts, rather than an assumed real-world detail, determine this paper case. Compare the recorded action or value with the stated rule before choosing an answer.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Read the exact key and distinguish its stated value type.
- Valid JSON syntax is different from a valid application record.
See the answer and explanation
Number
The supplied case states: Value at count. Object: {"id":"007","count":5,"done":true,"tags":["red","blue"]}. Which value type is requested? Under the stated distinction, this identifies Number. JSON represents objects, arrays and primitive values with defined syntax. An object maps text keys to values. Quoted digits are text rather than a numeric quantity. The supplied data is a small original object; parsing it does not imply its fields satisfy an application’s business rules. Read the exact key and distinguish its stated value type.
Take it further
New JSON{"id":"012", "values":[2, 4], "active": false}. Expected: id is text, values is an array, active is Boolean. Valid syntax does not validate the application’s business rules.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
Your choices are temporary. Feedback appears after you check all the answers.
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Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.