Is JSON safe to parse from untrusted sources?

JSON itself cannot execute code like JavaScript eval() can, making it safer than older exchange formats. However, deeply nested JSON can exhaust memory (a "billion laughs" variant) — use streaming parsers and limit recursion depth when processing untrusted input.

JSON vs XLSX — Differences, File Size & When to Use Each

Q: What is a JSON file?

JSON (JavaScript Object Notation) is a lightweight text format for data exchange, popularized by Douglas Crockford around 2001. JSON represents nested objects, arrays, strings, numbers, booleans, and null values in a syntax derived from JavaScript. It is the default data format for modern web APIs.

Q: How do I open a JSON file?

JSON files are plain text — open them in any text editor (Notepad, VS Code, Sublime Text, TextEdit). For formatted reading, use JSON-aware editors (VS Code auto-indents) or online viewers like jsonformatter.org. Every web browser displays JSON directly if you open the file locally.

Q: How do I convert JSON to CSV?

Use KaijuConverter&#039;s JSON-to-CSV converter for nested data flattened into a tabular format. For simple flat JSON (array of objects), command-line tools like jq + csvkit give more control. Python&#039;s pandas and JavaScript&#039;s PapaParse also handle the conversion in one line of code.

Q: JSON vs YAML: which should I use?

JSON for machine-to-machine data exchange (APIs, config) — strict spec, fast parsers in every language. YAML for human-edited config files — supports comments, multi-line strings, and references. Kubernetes, Docker Compose, and GitHub Actions use YAML; REST APIs overwhelmingly use JSON.

Q: Why can&#039;t I add comments to JSON?

JSON&#039;s strict specification disallows comments to keep parsers simple and unambiguous. Workarounds include JSONC (JSON with Comments, used by VS Code config), JSON5 (relaxed syntax with comments), or a convention of adding a &quot;comment&quot; or &quot;_doc&quot; field in your data.

JSON vs XLSX

Um comparativo detalhado de JSON Data e Excel Spreadsheet — tamanho de arquivo, qualidade, compatibilidade e qual escolher de acordo com seu fluxo de trabalho.

Converter XLSX → JSON

JSON

JSON Data

Documents & Text

JSON (JavaScript Object Notation) is a lightweight data interchange format that is human-readable and easy for machines to parse and generate. It has become the dominant format for web APIs, configuration files, and structured data exchange.

Sobre os arquivos JSON

XLSX

Excel Spreadsheet

Spreadsheets & Data

XLSX is the modern Microsoft Excel format based on Open XML. It is the industry standard for spreadsheets, supporting formulas, charts, pivot tables, and conditional formatting.

Sobre os arquivos XLSX

Comparativo de vantagens

JSON Vantagens

Dead-simple — you can memorize the entire grammar on one page.
Native parsers in every programming language.
Human-readable and easy to debug.
Compact — much smaller than equivalent XML.
Frozen spec — a JSON parser written in 2010 still handles new JSON files from 2026.

XLSX Vantagens

Much smaller than legacy .xls files thanks to ZIP + XML.
Human-readable structure — easy to extract data programmatically.
Supports macros (as .xlsm variant), charts, pivot tables, conditional formatting.
Universal support: Excel, LibreOffice, Google Sheets, Numbers, pandas.
ISO/IEC 29500 standardized.

Limitações

JSON Limitações

No comments allowed — config files feel verbose.
No trailing commas — a constant source of parse errors.
No native date, decimal, or binary types — everything is strings or numbers.
Easily bloated by repeated keys; large payloads compress poorly vs binary alternatives.
Streaming is awkward — JSON wants to be parsed whole.

XLSX Limitações

Macros in .xlsm are a common malware vector — disabled by default in Office.
1M-row limit is a cultural problem — people put too much data in Excel.
Subtle formula differences between Excel, LibreOffice, and Sheets.
Large files with many formulas recalculate slowly.

Especificações técnicas

Especificação	JSON	XLSX
MIME type	application/json	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Extension	.json	—
Standard	ECMA-404, RFC 8259	—
Encoding	UTF-8, UTF-16, or UTF-32	—
Allowed types	object, array, string, number, boolean, null	—
Container	—	ZIP (Office Open XML)
Max rows	—	1,048,576
Max columns	—	16,384
Released in	—	Microsoft Office 2007
Variants	—	.xlsx, .xlsm (macros), .xlsb (binary)

Tamanhos típicos de arquivo

JSON

Small config < 1 KB
REST API payload 1-100 KB
Database export 10 MB - 100 GB

XLSX

Small budget spreadsheet 20–80 KB
Financial model with charts 1–10 MB
Large dataset (100k rows) 10–50 MB
Enterprise model (1M+ rows) 100–500 MB

Pronto para converter?

Converta entre JSON e XLSX online, grátis e sem instalar nada. Upload criptografado, exclusão automática em 60 minutos.

Converter XLSX para JSON

Perguntas frequentes

JSON (JavaScript Object Notation) is a lightweight text format for data exchange, popularized by Douglas Crockford around 2001. JSON represents nested objects, arrays, strings, numbers, booleans, and null values in a syntax derived from JavaScript. It is the default data format for modern web APIs.

JSON files are plain text — open them in any text editor (Notepad, VS Code, Sublime Text, TextEdit). For formatted reading, use JSON-aware editors (VS Code auto-indents) or online viewers like jsonformatter.org. Every web browser displays JSON directly if you open the file locally.

Use KaijuConverter's JSON-to-CSV converter for nested data flattened into a tabular format. For simple flat JSON (array of objects), command-line tools like jq + csvkit give more control. Python's pandas and JavaScript's PapaParse also handle the conversion in one line of code.

JSON for machine-to-machine data exchange (APIs, config) — strict spec, fast parsers in every language. YAML for human-edited config files — supports comments, multi-line strings, and references. Kubernetes, Docker Compose, and GitHub Actions use YAML; REST APIs overwhelmingly use JSON.

JSON's strict specification disallows comments to keep parsers simple and unambiguous. Workarounds include JSONC (JSON with Comments, used by VS Code config), JSON5 (relaxed syntax with comments), or a convention of adding a "comment" or "_doc" field in your data.

JSON itself cannot execute code like JavaScript eval() can, making it safer than older exchange formats. However, deeply nested JSON can exhaust memory (a "billion laughs" variant) — use streaming parsers and limit recursion depth when processing untrusted input.