I’ll introduce how using fast-safe-stringify is good for preventing TypeError: Converting circular structure to JSON with JSON.stringify.

Error with JSON.stringify

When using JSON.stringify in cases like the one below, TypeError: Converting circular structure to JSON occurs.

const o = { a: 1 }
o.o = o

console.log(JSON.stringify(o))

// TypeError: Converting circular structure to JSON

Converting to [Circular] String with fast-safe-stringify

Using fast-safe-stringify instead of JSON.stringify prevents the TypeError: Converting circular structure to JSON and converts it to the string [Circular].

const safeStringify = require('fast-safe-stringify')
const o = { a: 1 }
o.o = o
 
console.log(safeStringify(o))

// '{"a":1,"o":"[Circular]"}'

fast-safe-stringify is Faster than json-stringify-safe

While json-stringify-safe exists for the same purpose, benchmarks posted on GitHub show that fast-safe-stringify is faster.

• Benchmarks - davidmarkclements/fast-safe-stringify

That’s all from the Gemba where I use fast-safe-stringify to avoid encountering TypeError: Converting circular structure to JSON.