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    • JavaScript JSON

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    Question 1

    What is the purpose of the search() method in strings?

    • A

      Returns an array of matches

    • B

      Finds the index of the first match

    • C

      Validates a regular expression pattern

    • D

      Replaces the first match with a new string

    Question 2

    What does the i flag in a regular expression do?

    • A

      Makes the search case-insensitive

    • B

      Searches for all matches globally

    • C

      Stops the search after the first match

    • D

      Allows the use of groups in the regular expression

    Question 3

    Which method converts a JSON string into a JavaScript object?

    • A

      JSON.stringify()

    • B

      JSON.parse()

    • C

      JSON.format()

    • D

      JSON.validate()

    Question 4

    What will the following code output?

    JavaScript 
    const obj = { name: "Ajay", age: 25 };
console.log(JSON.stringify(obj));


    • A

      undefined

    • B

      { name: "Ajay", age: 25 }

    • C

      '{"name":"Ajay","age":25}'

    • D

      Error

    Question 5

    Which of the following is a valid JSON structure?

    • A

      { "name": "Ajay", "age": 25 }

    • B

      { name: "Ajay", age: 25 }

    • C

      [name: "Ajay", age: 25]

    • D

      { name: "Ajay", age: "25" }

    Question 6

    What will the following code log?

    JavaScript 
    const obj = { name: "Ajay", age: 30 };
const json = JSON.stringify(obj);
console.log(JSON.parse(json).age);


    • A

      undefined

    • B

      30

    • C

      Error

    • D

      null

    Question 7

    Which method can convert a JavaScript object to a readable JSON string?

    • A

      JSON.format()

    • B

      JSON.validate()

    • C

      JSON.stringify()

    • D

      JSON.parse()

    Question 8

    What is the key difference between JSON and JavaScript objects?

    • A

      JSON allows functions as values.

    • B

      JSON keys can be unquoted.

    • C

      JSON can include circular references.

    • D

      JSON requires double-quoted keys and string values.

    Question 9

    What will the following code log?

    JavaScript 
    const json = '[{"id":1},{"id":2}]';
console.log(JSON.parse(json)[0].id);


    • A

      Error

    • B

      undefined

    • C

      1

    • D

      null

    Question 10

    What does JSON.parse() do?

    • A

      Converts a JavaScript object to a JSON string

    • B

      Parses a JSON string into a JavaScript object

    • C

      Formats a JSON string for readability

    • D

      Validates a JSON string

    There are 10 questions to complete.

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