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JSON

50 curated JSON interview questions — syntax, parsing, schema validation, and JSON vs XML, with worked answers for every experience level.

26 questions
SyntaxParsingSerializationSchemaJSON vs XML

Sample Questions (26 live)

JSON vs XMLEasy

Why did JSON largely replace XML for APIs?

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BasicsEasy

What is JSON?

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BasicsEasy

Why is JSON so widely used?

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JSON vs XMLEasy

What are the key structural differences between JSON and XML?

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SyntaxEasy

What data types does JSON support?

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SyntaxEasy

What are the syntax rules of valid JSON?

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Objects & ArraysEasy

What is the difference between a JSON object and a JSON array?

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Objects & ArraysEasy

How do nested JSON objects work?

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Objects & ArraysEasy

How are JSON arrays used and what can they contain?

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Objects & ArraysMedium

How do you safely access values in nested JSON?

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Objects & ArraysMedium

What does it mean to flatten JSON and when would you do it?

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ParsingEasy

What is JSON parsing?

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SerializationEasy

What is the difference between serialization and deserialization?

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ParsingMedium

What are common JSON parsing errors and their causes?

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ParsingMedium

How do you handle invalid or malformed JSON?

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SerializationEasy

What is pretty-printing JSON and how do you do it?

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REST APIsEasy

How is JSON used in REST APIs?

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REST APIsEasy

What is the difference between request JSON and response JSON?

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REST APIsEasy

How do HTTP status codes work together with JSON responses?

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ValidationMedium

How do you validate incoming JSON?

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SchemaMedium

What is JSON Schema and why is it useful?

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PerformanceHard

How do you handle large JSON payloads efficiently?

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SecurityMedium

What are JSON security best practices?

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AdvancedMedium

What is the difference between JSON and BSON?

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AdvancedMedium

How does JSON structure a JWT (JSON Web Token)?

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AdvancedMedium

What are common JSON interview scenarios and how do you approach them?

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