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Online JSON Editor

Write, refactor, and download JSON source in the browser with completions, find, and format helpers.

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Completions appear as you type; press Ctrl+Space to open the list. Tab expands snippets where available. Find: Ctrl+F (Cmd+F on Mac). Format: toolbar button or Ctrl+Shift+B for supported languages.

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Write, refactor, and download JSON source in the browser with completions, find, and format helpers.

Config object

{
  "name": "api",
  "version": 2,
  "features": { "metrics": true },
  "routes": ["/health", "/v1/items"]
}

Variables

name = "value"
count = 0

Branching

if condition {
  action()
} else {
  fallback()
}

Loops

for item in collection {
  process(item)
}

Comments

// line comment

Parse → transform → emit

// JSON pipeline sketch
const input = readLines();
const output = input
  .map(line => line.trim())
  .filter(Boolean)
  .map(transform);
writeLines(output);

Error handling wrapper

// JSON
function runSafely(task) {
  try {
    return { ok: true, value: task() };
  } catch (err) {
    return { ok: false, error: String(err) };
  }
}

Does JSON code run on ConversionTab servers?
No. Editing happens in your browser. Download the file and run it in your usual compiler, runtime, or platform.
Can I change theme and font size?
Yes. Use the toolbar above the editor; choices persist in local storage for your browser profile.