JSON Repair

Fix broken JSON: trailing commas, single quotes, unquoted keys, comments, truncation and stray Markdown. Returns valid JSON.

Free to try Pay by wallet (x402) json-repair

Example

Input

{
  "json": "{\"name\": \"Test\", \"value\": 42}"
}

Answer

{
  "json": "{\n  \"name\": \"Test\",\n  \"value\": 42\n}",
  "valid": true,
  "parsed": {
    "name": "Test",
    "value": 42
  },
  "fixes_applied": []
}

Try it

Runs the real tool from your browser, with no key. Free calls are limited to 300 a month across all free tools.

Inputs (JSON)

{
  "json": "{\"name\": \"Test\", \"value\": 42}"
}

Edit the values, then run.

Inputs

Field	Type	Required	What it is
`json`	string	Yes	Broken JSON string to repair

Output fields

How reliably each field appears in a successful answer.

Field	Type	Appears
`json`	string	Always (present in every successful answer)
`valid`	boolean	Always (present in every successful answer)
`parsed`	object	Always (present in every successful answer)
`fixes_applied`	array	Always (present in every successful answer)

How to call it

The same tool through each route. MCP clients reach it through Strale’s server at https://api.strale.io/mcp; the call below is what the agent sends.

# Free tool: works without a key, within a monthly allowance. Add your key for more.
curl -X POST https://api.strale.io/v1/do \
  -H 'Content-Type: application/json' \
  -d '{
    "capability_slug": "json-repair",
    "inputs": {
      "json": "{\"name\": \"Test\", \"value\": 42}"
    },
    "max_price_cents": 5
  }'

{
  "tool": "strale_execute",
  "arguments": {
    "slug": "json-repair",
    "inputs": {
      "json": "{\"name\": \"Test\", \"value\": 42}"
    },
    "max_price_cents": 5
  }
}

import { Strale } from "straleio";

const strale = new Strale({ apiKey: process.env.STRALE_API_KEY! });
const result = await strale.do({
  capability_slug: "json-repair",
  inputs: {
    "json": "{\"name\": \"Test\", \"value\": 42}"
  },
  max_price_cents: 5,
});

import os
from straleio import Strale, DoRequest

strale = Strale(api_key=os.environ["STRALE_API_KEY"])
result = strale.do(DoRequest(
    capability_slug="json-repair",
    inputs={
        "json": "{\"name\": \"Test\", \"value\": 42}",
    },
    max_price_cents=5,
))

# No account. The first request answers 402 with the price in USDC;
# an x402 client pays it from your wallet and repeats the request.
curl -i 'https://api.strale.io/x402/v2/json-repair?json=%7B%22name%22%3A+%22Test%22%2C+%22value%22%3A+42%7D'

Limitations

Severely malformed JSON may not be recoverable
Repairs common JSON errors (trailing commas, unquoted keys, single quotes) — severely malformed input may not be recoverable
What to do instead: If repair fails, extract valid JSON segments manually and reconstruct the intended structure.