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jsonlint.echovalue.dev

Developer ToolsTools verifiedOct 26, 2026

Fix invalid JSON (trailing commas, single quotes, comments), validate parse errors with line/column, and query data with jq filters. 100% client-side.

lint_jsonAction

Validate JSON and rewrite it as formatted JSON with 2-space indentation.

View tool JSON

{
  "name": "lint_json",
  "kind": "act",
  "impl": "imperative",
  "description": "Validate JSON and rewrite it as formatted JSON with 2-space indentation.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "json": {
        "type": "string",
        "description": "Optional JSON string. If omitted, the current editor content is used."
      }
    },
    "additionalProperties": false
  },
  "page": "/"
}

repair_jsonAction

Repair malformed JSON with JSONRepair, then return formatted JSON.

View tool JSON

{
  "name": "repair_json",
  "kind": "act",
  "impl": "imperative",
  "description": "Repair malformed JSON with JSONRepair, then return formatted JSON.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "json": {
        "type": "string",
        "description": "Optional malformed JSON string. If omitted, the current editor content is used."
      }
    },
    "additionalProperties": false
  },
  "page": "/"
}

minify_jsonAction

Remove whitespace from valid JSON and return a compact string.

View tool JSON

{
  "name": "minify_json",
  "kind": "act",
  "impl": "imperative",
  "description": "Remove whitespace from valid JSON and return a compact string.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "json": {
        "type": "string",
        "description": "Optional JSON string. If omitted, the current editor content is used."
      }
    },
    "additionalProperties": false
  },
  "page": "/"
}

apply_jq_filterAction

Apply a jq-style filter to JSON using the page’s jq-lite engine.

View tool JSON

{
  "name": "apply_jq_filter",
  "kind": "act",
  "impl": "imperative",
  "description": "Apply a jq-style filter to JSON using the page’s jq-lite engine.",
  "inputSchema": {
    "type": "object",
    "properties": {
      "json": {
        "type": "string",
        "description": "Optional JSON string. If omitted, the current editor content is used."
      },
      "query": {
        "type": "string",
        "description": "jq-style query such as .users, .[], map(.name), or select(.age > 18)."
      }
    },
    "required": [
      "query"
    ],
    "additionalProperties": false
  },
  "page": "/"
}