JSON Editor

Format, minify, validate and repair JSON, with advanced editing for field search, stringified-field expansion, field serialization, flattening and structure restoration.

Structural operations apply to the whole JSON by default; for a single field, use the field-level actions shown when you hover that field.
Structural operations require valid or repaired JSON input.

Show details

Error Diagnosis and Repair

Pinpoint the exact error location by line and column
Auto-fix common JSON errors

Search and Replace

Full-text search: open with Ctrl / Cmd + F, with replace and refine support
Field search: open with Ctrl / Cmd + Shift + F, or switch from full-text mode with the Mode toggle
Field search supports multi-field combinations such as users.[*].city and users.[*].role, plus include / exclude conditions

Structural Operations (Global)

Use these operations to reshape the whole JSON or work with nested JSON stored as strings, such as a payload field in API responses.

Expand stringified fields so JSON text is expanded in place into editable JSON structure
Serialize a field back from JSON object to JSON string
Flatten nested structures into dot-path fields
Expand flattened fields back into nested structures
Restore structure to undo the last structural transformation without discarding content edits

Field-Level Actions

When you hover a field, you can run these actions on the current field:

Copy field value, expand stringified JSON, serialize field, flatten field, expand flattened fields and filter
For arrays, you can choose whether the action applies to all items or only the current element

Example: Edit Content Inside a JSON String Directly

When a field like payload contains nested JSON as a string, expand it first, edit it as JSON, then restore the original message shape.

Input

{
  "payload": "{\"key1\":\"hello\"}"
}

After Expand

{
  "payload": {
    "key1": "hello"
  }
}

Restore After Editing

{
  "payload": "{\"key1\":\"hello world\"}"
}