28 lines
637 B
JavaScript
28 lines
637 B
JavaScript
const base64url = require('./base64url');
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module.exports = (token) => {
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if (typeof token !== 'string' || !token) {
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throw new TypeError('JWT must be a string');
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}
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const { 0: header, 1: payload, 2: signature, length } = token.split('.');
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if (length === 5) {
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throw new TypeError('encrypted JWTs cannot be decoded');
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}
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if (length !== 3) {
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throw new Error('JWTs must have three components');
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}
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try {
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return {
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header: JSON.parse(base64url.decode(header)),
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payload: JSON.parse(base64url.decode(payload)),
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signature,
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};
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} catch (err) {
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throw new Error('JWT is malformed');
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}
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};
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